Senior Research Fellow
Overview
Dr Tim O'Hare joined QAAFI’s Centre for Nutrition and Food Sciences in October 2010. He is a Plant Physiologist co-located at UQ Gatton and the Coopers Plains Health and Food Science Precinct in Brisbane. His research aims to increase the nutrient density of fruit, vegetables and nuts through genetic, environmental or agronomic biofortification. His work overlaps with plant biochemistry, molecular biology, consumer science and human health.
He obtained his PhD in 1989 from the University of Queensland, before working for the Queensland Department of Agriculture and Fisheries in fruit and vegetable research in Hamilton (Brisbane), the Atherton Tableland (Tropical North Queensland) and Gatton (Lockyer Valley).
Research Interests
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Zeaxanthin-biofortified sweetcorn for eye health
Zeaxanthin is an orange pigment that is selectively accumulated in the human eye (specifically the macula) to protect against blue light oxidation of photoreceptors (macular degeneration). Because we are unable to synthesise zeaxanthin, it must be obtained through our diet or through supplements. Although yellow sweetcorn is a good dietary source of zeaxanthin, the amount of sweetcorn that would be required to give sufficient dosage is in the range of between 4-11 cobs a day. We have subsequently developed a zeaxanthin-biofortified sweetcorn with 10 times the concentration of zeaxanthin, reducing consumption down to less than a single cob as part of a normal meal. Research interests include changes in the zeaxanthin profile of the rest of the corn plant, bioaccessibilty/bioavailability of corn-based zeaxanthin to humans, other corn-based zeaxanthin sources such as popcorn and non-sweet maize. -
Deep pink high-lycopene tomatoes
Lycopene is the red pigment in tomatoes, and has been linked to a reduced incidence in prostate cancer, a leading cause of death in men. The concentration of lycopene is able to be manipulated by the combination of several key mutations that either modify the amount of lycopene that is synthesised, or increases the storage capability of this compound in the fruit cells. Unfortunately, high-lycopene tomatoes, which have about 3 times as much lycopene, look similar to standard tomatoes, unless they are cut open. However, introducing another mutation which removes a cloaking pigment in the skin allows the fruit to reveal its deep-pink colour, visually differentiating it from standard tomatoes. -
Development of super-sweet purple sweetcorn
Purple sweetcorn currently does not exist, partly because the pathway for the pigment producing purple colouration (anthocyanin) is extremely closely linked to a gene preventing sugar accumulation. We have recently broken this linkage, enabling the development of purple sweetcorn. Initially developed from non-sweet Peruvian purple maize, the development of a purple sweetcorn requires further extensive study in this totally novel crop. Anthocyanins have also been links to a range of health benefits, particularly in relation to cardiovascular disease. Areas of further interest include molecular biology of the anthocyanin pigment pathway, kernel physiology, postharvest pigment development and storage, and bioaccessibility of the anthocyanin pigment in the human body. -
Understanding the fatty acid profile of macadamia nuts
Three quarters of the weight of a macadamia kernel consists of oil. This oil largely consists of the mono-unsaturated oils, oleic acid (as in olive oil) and the relatively unique omega-7 oil, palmitoleic acid. Macadamias also contain a small but significant proportion of saturated fat, considered to be detrimental to cardiovascular health. Further reduction of the saturated fat content of macadamia, by increasing their conversion to beneficial mono-unsaturated fats is currently under investigation. Factors including genetics of the wide Australian native germplasm collection, the unique fatty acid pathway, and effect of pollinators are current areas of research interest. -
High-zeaxanthin orange capsicums for eye health
Zeaxanthin is an orange pigment that is actively accumulated in the human macula from dietary sources to protect against blue light oxidation of human photoreceptors. Destruction of photoreceptors leads to macular degeneration, the leading form of blindness in Australia. Increasing dietary intake of zeaxanthin is associated with an increase in our macular pigment optical density, which is further linked to slowing the later stages of macular degeneration. Although zeaxanthin is relatively rare in the Western diet, orange capsicums (unlike red or green capsicums) appear to be a particularly good source, with concentrations approaching that of artificial supplement tablets. Research interests include the zeaxanthin pigment diversity across orange capsicums and chillies, the genetic control of zeaxanthin accumulation, and the potential further increase in zeaxanthin concentration. -
Zinc-biofortification of sweetcorn by foliar sprays
Zinc is an essential mineral vital to human health. Vegetarian sources of zinc are normally limited to legume crops, such as beans. However, zinc concentrations in other vegetables such as sweetcorn can be increased through foliar zinc sprays, especially during kernel development. Although it may be possible to increase the genetic potential to increase zinc uptake, this can be further augmented, as much as 70%, by direct foliar application. How this occurs is not fully understood, but it appears to bypass the bottlenecks that are present via normal soil uptake. -
Colour variation in strawberries - the purple strawberry
Strawberries are generally red in colour, due to a specific anthocyanin pigment called pelargonidin. Colour can vary however across the genetic germplasm, resulting in deeper reds, or even burgundies, that are almost purple. Although anthocyanins have generally been linked to cardiovascular health benefits, different types of anthocyanins may potentially vary not just in colour, but also in their efficacy. Research interest includes the relationship between anthocyanin profile and colour, it distribution between different fruiting and vegetative tissues, and genetic means of how this colour is controlled.
Qualifications
- Graduate Diploma in Biotechnology, Queensland University of Technology
- Bachelor of Agricultural Science, The University of Queensland
- Doctor of Philosophy, The University of Queensland
Publications
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Journal Article: Zinc biofortification of immature maize and sweetcorn (Zea mays L.) kernels for human health
Cheah, Zhong Xiang, O’Hare, Tim J., Harper, Stephen M., Kochanek, Jitka and Bell, Michael J. (2020). Zinc biofortification of immature maize and sweetcorn (Zea mays L.) kernels for human health. Scientia Horticulturae, 272109559, doi:10.1016/j.scienta.2020.109559
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Journal Article: Optimisation of extraction procedure and development of LC–DAD–MS methodology for anthocyanin analysis in anthocyanin-pigmented corn kernels
Hong, H. T., Netzel, M. E. and O'Hare, T. J. (2020). Optimisation of extraction procedure and development of LC–DAD–MS methodology for anthocyanin analysis in anthocyanin-pigmented corn kernels. Food Chemistry, 319126515, doi:10.1016/j.foodchem.2020.126515
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Journal Article: Variation in sweetcorn kernel Zn concentration a reflection of source-sink dynamics influenced by kernel number
Cheah, Zhong Xiang, O'Hare, Tim J., Harper, Stephen M. and Bell, Michael J. (2020). Variation in sweetcorn kernel Zn concentration a reflection of source-sink dynamics influenced by kernel number. Journal of Experimental Botany doi:10.1093/jxb/eraa244
Grants
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Understanding the distribution of Zn in sweetcorn kernels for improving human nutrition
(2017) Australian Synchrotron Access Program (ANSTO)
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(2016–2021) Horticulture Innovation Australia Limited
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(2015–2018) Queensland Department of Agriculture and Fisheries
Supervision
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Assessing the bioactivity of tomato extracts from varieties with unique carotenoid profiles on human in vitro prostate cancer cell lines
Doctor Philosophy
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Endogenous fatty acid desaturation of palmitic to palmitoleic acid in macadamia kernel tissue.
Doctor Philosophy
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Identification of genetic variants in orange-pigmented capsicum and chillli of the Capsicum annuum, C. chinense, and C. baccatum species.
Doctor Philosophy
Publications
Book Chapter
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Fox, Glen P. and O'Hare, Tim J. (2017). Analysing maize grain quality. Achieving sustainable cultivation of maize: volume 1. (pp. 1-24) edited by .Cambridge, England: Burleigh Dodds Science Publishing.
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O'Hare, Timothy J. and Williams, David J. (2014). Papaya as a medicinal plant. Genetics and genomics of papaya. (pp. 391-407) edited by Ray Ming and Paul H. Moore.New York, NY, United States: Springer New York. doi:10.1007/978-1-4614-8087-7_21
Journal Article
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Zinc biofortification of immature maize and sweetcorn (Zea mays L.) kernels for human health
Cheah, Zhong Xiang, O’Hare, Tim J., Harper, Stephen M., Kochanek, Jitka and Bell, Michael J. (2020). Zinc biofortification of immature maize and sweetcorn (Zea mays L.) kernels for human health. Scientia Horticulturae, 272109559, doi:10.1016/j.scienta.2020.109559
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Hong, H. T., Netzel, M. E. and O'Hare, T. J. (2020). Optimisation of extraction procedure and development of LC–DAD–MS methodology for anthocyanin analysis in anthocyanin-pigmented corn kernels. Food Chemistry, 319126515, doi:10.1016/j.foodchem.2020.126515
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Cheah, Zhong Xiang, O'Hare, Tim J., Harper, Stephen M. and Bell, Michael J. (2020). Variation in sweetcorn kernel Zn concentration a reflection of source-sink dynamics influenced by kernel number. Journal of Experimental Botany doi:10.1093/jxb/eraa244
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A dataset for anthocyanin analysis in purple-pericarp sweetcorn kernels by LC-DAD-MS
Hong, Hung Trieu, Netzel, Michael Erich and O'Hare, Timothy James (2020). A dataset for anthocyanin analysis in purple-pericarp sweetcorn kernels by LC-DAD-MS. Data in Brief, 30105495, doi:10.1016/j.dib.2020.105495
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Zeaxanthin-biofortified popcorn for eye health
O’Hare, Tim (2020). Zeaxanthin-biofortified popcorn for eye health. Proceedings, 36 (1) doi:10.3390/proceedings2019036192
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Calvo-Brenes, Paula and O´Hare, Tim (2020). Effect of freezing and cool storage on carotenoid content and quality of zeaxanthin-biofortified and standard yellow sweet-corn (Zea mays L.). Journal of Food Composition and Analysis, 86103353, 1-7. doi:10.1016/j.jfca.2019.103353
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Hong, H. T., Netzel, M. E. and O'Hare, T. J. (2020). Anthocyanin composition and changes during kernel development in purple-pericarp supersweet sweetcorn. Food Chemistry, 315126284, doi:10.1016/j.foodchem.2020.126284
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Hu, Wei, Fitzgerald, Melissa, Topp, Bruce, Alam, Mobasher and O'Hare, Tim J. (2019). A review of biological functions, health benefits, and possible de novo biosynthetic pathway of palmitoleic acid in macadamia nuts. Journal of Functional Foods, 62103520, doi:10.1016/j.jff.2019.103520
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Cheah, Zhong Xiang, Kopittke, Peter M., Harper, Stephen M., Meyer, Gregor, O'Hare, Tim J. and Bell, Michael J. (2019). Speciation and accumulation of Zn in sweetcorn kernels for genetic and agronomic biofortification programs. Planta, 250 (1) 219-227. doi:10.1007/s00425-019-03162-x
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Assessing fatty acid profiles of macadamia nuts
O’Hare, Tim J., Trieu, Hung Hong, Topp, Bruce, Russell, Dougal, Pun, Sharon, Torrisi, Caterina and Liu, Dianna (2019). Assessing fatty acid profiles of macadamia nuts. HortScience, 54 (4) 633-637. doi:10.21273/hortsci13418-18
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Calvo-Brenes, Paula, Fanning, Kent and O'Hare, Tim (2019). Does kernel position on the cob affect zeaxanthin, lutein and total carotenoid contents or quality parameters, in zeaxanthin-biofortified sweet-corn?. Food Chemistry, 277490-495. doi:10.1016/j.foodchem.2018.10.141
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Cheah, Zhong Xiang, Kopittke, Peter M., Harper, Stephen M., O’Hare, Tim J., Wang, Peng, Paterson, David J., de Jonge, Martin D. and Bell, Michael J. (2019). In situ analyses of inorganic nutrient distribution in sweetcorn and maize kernels using synchrotron-based X-ray fluorescence microscopy. Annals of Botany, 123 (3) 543-556. doi:10.1093/aob/mcy189
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High folate strawberry – tasty and healthy?
Netzel, Michael E., O'Hare, Tim, Striegel, Lisa and Rychlik, Michael (2017). High folate strawberry – tasty and healthy?. SimplyRed (48) 12-12.
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O'Hare, Tim J., Fanning, Kent J. and Martin, Ian F. (2015). Zeaxanthin biofortification of sweet-corn and factors affecting zeaxanthin accumulation and colour change. Archives of Biochemistry and Biophysics, 572184-187. doi:10.1016/j.abb.2015.01.015
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The effect of lycopene on the PI3K/Akt signalling pathway in prostate cancer
Chen, Jiezhong, O'Donoghue, Adam, Deng, Yi-Fu, Zhang, Bing, Kent, Fanning and O'Hare, Tim (2014). The effect of lycopene on the PI3K/Akt signalling pathway in prostate cancer. Anti-Cancer Agents in Medicinal Chemistry, 14 (6) 800-805. doi:10.2174/1871520614666140521121317
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Ko, Lien, Eccleston, Karen, O'Hare, Tim, Wong, Lung, Giles, Janet and Smith, Mike (2013). Field evaluation of transgenic pineapple (Ananas comosus (L.) Merr.) cv. 'Smooth Cayenne' for resistance to blackheart under subtropical conditions. Scientia Horticulturae, 159103-108. doi:10.1016/j.scienta.2013.05.006
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Increase in beta-lonone, a Carotenoid-Derived Volatile in Zeaxanthin-Biofortified Sweet Corn
Gallon, Camilla Z., Fuller, Steven C., Fanning, Kent J., Smyth, Heather E., Pun, Sharon, Martin, Ian F. and O'Hare, Timothy J. (2013). Increase in beta-lonone, a Carotenoid-Derived Volatile in Zeaxanthin-Biofortified Sweet Corn. Journal of Agricultural and Food Chemistry, 61 (30) 7181-7187. doi:10.1021/jf402326e
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Williams, David J., Pun, Sharon, Chaliha, Mridusmita, Scheelings, Pieter and O'Hare, Timothy (2013). An unusual combination in papaya (Carica papaya): the good (glucosinolates) and the bad (cyanogenic glycosides). Journal of Food Composition and Analysis, 29 (1) 82-86. doi:10.1016/j.jfca.2012.06.007
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O'Hare, T. J., Pyke, M., Scheelings, P., Eaglesham, G., Wong, L., Houlihan, A. and Graham, G. (2012). Impact of low temperature storage on active and storage forms of folate in choy sum (Brassica rapa subsp parachinensis). Postharvest Biology and Technology, 7485-90. doi:10.1016/j.postharvbio.2012.06.020
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Multivariate analysis of fresh-cut carambola slices stored under different temperatures
Teixiera, Gustavo H.A., Durigan, José F., Ferraudo, Antônio S., Alves, Ricardo E. and O'Hare, Timothy J. (2012). Multivariate analysis of fresh-cut carambola slices stored under different temperatures. Postharvest Biology And Technology, 63 (1) 91-97. doi:10.1016/j.postharvbio.2011.09.005
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Breeding high lycopene tomatoes for prostate cancer using snap markers
Dillon, N. L., McGrath, DJ, Walker, I. O., Hucks, L. A., Wong, L. S. and O’Hare, T. J. (2010). Breeding high lycopene tomatoes for prostate cancer using snap markers. SABRAO Journal of Breeding and Genetics, 41
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Development of indeterminate high-lycopene tomatoes from a determinate background
McGrath, D. J., Walker, I. O., Hucks, L. A., Wong, L. S., Dillon, N. L. and O’Hare T. J. (2010). Development of indeterminate high-lycopene tomatoes from a determinate background. SABRAO Journal of Breeding and Genetics, 42
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Enhancing zeaxanthin in sweetcorn for age-related macular degeneration
Zeppa, A., Fanning, K.J., Fekybelu, S., Holton, T.A., Innes, D., Keating, V., Martin, I., O’Hare, T.J., Pun, S. and Wong, L.S. (2010). Enhancing zeaxanthin in sweetcorn for age-related macular degeneration. SABRAO Journal of Breeding and Genetics, 9091-96.
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Key Role of Fe2+ in Epithiospecifier Protein Activity
WilliamsDavidJ, CritchleyChrista, PunSharon, ChalihaMridusmita, O'Hare, Timothy and JamesNSeiber (2010). Key Role of Fe2+ in Epithiospecifier Protein Activity. Journal of Agricultural and Food Chemistry, 58 (15) 8512-8521. doi:10.1021/jf904532n
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Screening sweetcorn for enhanced zeaxanthin concentration
Fanning, Kent J., Martin, Ian, Wong, Lung, Keating, Veronique, Pun, Sharon and O'Hare, Tim (2010). Screening sweetcorn for enhanced zeaxanthin concentration. Journal of the Science of Food and Agriculture, 90 (1) 91-96. doi:10.1002/jsfa.3787
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Williams, David J., Critchley, Christa, Pun, Sharon, Chaliha, Mridusmita and O'Hare, Timothy J. (2009). Differing mechanisms of simple nitrile formation on glucosinolate degradation in Lepidium sativum and Nasturtium officinale seeds. Phytochemistry, 70 (11-12) 1401-1409. doi:10.1016/j.phytochem.2009.07.035
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O'Hare, T. J., Williams, D. J., Zhang, B., Wong, L. S., Jarrett, S., Pun,S., Jorgensen, W. and Imsic, M. (2009). Radish sprouts versus broccoli sprouts: A comparison of anti-cancer potential based on glucosinolate breakdown products. Acta Horticulturae, 841187-192. doi:10.17660/ActaHortic.2009.841.21
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Williams, D. J., Critchley,C., Pun,S, Nottingham,S and O'Hare, T. J. (2008). Epithiospecifier protein activity in broccoli: The link between terminal alkenyl glucosinolates and sulphoraphane nitrile. Phytochemistry, 69 (16) 2765-2773. doi:10.1016/j.phytochem.2008.09.018
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Response of minimally processed carambola to chemical treatments and low-oxygen atmospheres
Teixeira, Gustavo H. A., Durigan, José F., Alves, Ricardo E. and O'Hare, Timothy J. (2008). Response of minimally processed carambola to chemical treatments and low-oxygen atmospheres. Postharvest Biology And Technology, 48 (3) 415-421. doi:10.1016/j.postharvbio.2007.08.011
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Glucosinolate composition and anti-cancer potential of daikon and radish sprouts
O'Hare, T.J., Wong, L.S., Force, L.E., Gurung, C.B., Irving, D.E. and Williams, D.J. (2008). Glucosinolate composition and anti-cancer potential of daikon and radish sprouts. Acta Horticulturae (765) 237-244. doi:10.17660/actahortic.2008.765.29
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Teixeira, Gustavo H. A., Durigan, José F., Alves, Ricardo E. and O'Hare, Timothy J. (2007). Use of modified atmosphere to extend shelf life of fresh-cut carambola (Averrhoa carambola L. cv. Fwang Tung). Postharvest Biology And Technology, 44 (1) 80-85. doi:10.1016/j.postharvbio.2006.11.007
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ForceLesleighE, O'Hare, Timothy J., WongLungS and IrvingDonaldE (2007). Impact of cold storage on glucosinolate levels in seed-sprouts of broccoli, rocket, white radish and kohl-rabi. Postharvest Biology and Technology, 44 (2) 175-178. doi:10.1016/j.postharvbio.2006.11.014
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Impact of atmosphere, organic acids, and calcium on quality of fresh-cut 'Kensington' mango
de Souza, Bianca Sarzi, O'Hare, Timothy James, Durigan, José Fernando and de Souza, Paulo Sergio (2006). Impact of atmosphere, organic acids, and calcium on quality of fresh-cut 'Kensington' mango. Postharvest Biology And Technology, 42 (2) 161-167. doi:10.1016/j.postharvbio.2006.06.004
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Cultivar affects browning susceptibility of freshly cut star fruit slices
De Almeida Teixeira, G. H., Durigan, J. F., Mattiuz, B. H., Alves, R. E. and O'Hare, T. J. (2006). Cultivar affects browning susceptibility of freshly cut star fruit slices. Scientia Agricola, 63 (1) 1-4. doi:10.1590/S0103-90162006000100001
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Able, Amanda J., Wong, Lung Sing, Prasad, Amikha and O'Hare, Timothy J. (2005). The physiology of senescence in detached pak choy leaves (Brassica rapa var. chinensis) during storage at different temperatures. Postharvest Biology and Technology, 35 (3) 271-278. doi:10.1016/j.postharvbio.2004.10.004
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Root growth, cytokinin and shoot dormancy in lychee (Litchi chinensis Sonn.)
O'Hare, T. J. and Turnbull, C. G. N. (2004). Root growth, cytokinin and shoot dormancy in lychee (Litchi chinensis Sonn.). Scientia Horticulturae, 102 (2) 257-266. doi:10.1016/j.scienta.2004.02.004
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O'Hare, T. J. (2004). Impact of root and shoot temperature on bud dormancy and floral induction in lychee (Litchi chinensis Sonn.). Scientia Horticulturae, 99 (1) 21-28. doi:10.1016/S0304-4238(03)00083-9
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Transcriptional regulation of a pineapple polyphenol oxidase gene and its relationship to blackheart
Zhou, Yuchan, O'Hare Tim J., Jobin-Decor, Marcelle, Underhill, Steven, J. R., Wills, Ron B. H. and Graham, Michael W. (2003). Transcriptional regulation of a pineapple polyphenol oxidase gene and its relationship to blackheart. Plant Biotechnology Journal, 1 (6) 463-478. doi:10.1046/j.1467-7652.2003.00042.x
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The effects of 1-methylcyclopropene on the shelf life of minimally processed leafy asian vegetables
Able, A. J., Wong, L. S., Prasad, A. and O'Hare, T. J. (2003). The effects of 1-methylcyclopropene on the shelf life of minimally processed leafy asian vegetables. Postharvest Biology and Technology, 27 (2) 157-161. doi:10.1016/S0925-5214(02)00093-5
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Able, Amanda J., Wong, Lung Sing, Prasad, Amikha and O'Hare, Timothy J (2002). 1-MCP is more effective on a floral brassica (Brassica oleracea var. italica L.) than a leafy brassica (Brassica rapa var. chinensis). Postharvest Biology and Technology, 26 (2) 147-155. doi:10.1016/S0925-5214(02)00011-X
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O'Hare, T. J. (2002). Interaction of temperature and vegetative flush maturity influences shoot structure and development of lychee (Litchi chinensis Sonn.). Scientia Horticulturae, 95 (3) 203-211. doi:10.1016/S0304-4238(02)00035-3
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Characterisation and induction of 'etch' browning in the skin of mango fruit
O'Hare, T. J., Bally, I. S. E., Dahler, J. M., Saks, Y. and Underhill, S. J. R. (1999). Characterisation and induction of 'etch' browning in the skin of mango fruit. Postharvest Biology And Technology, 16 (3) 269-277. doi:10.1016/S0925-5214(99)00030-7
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Postharvest physiology and storage of rambutan
O'Hare, T. J. (1995). Postharvest physiology and storage of rambutan. Postharvest Biology and Technology, 6 (3-4) 189-199. doi:10.1016/0925-5214(95)00022-X
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O'Hare, T.J. (1995). Effect of ripening temperature on quality and compositional changes of mango (Mangifera indica L.) cv. Kensington. Australian Journal of Experimental Agriculture, 35 (2) 259-263. doi:10.1071/EA9950259
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Low temperature and controlled atmosphere storage of rambutan
O'Hare, T. J., Prasad, A. and Cooke, A. W. (1994). Low temperature and controlled atmosphere storage of rambutan. Postharvest Biology and Technology, 4 (1-2) 147-157. doi:10.1016/0925-5214(94)90016-7
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Postharvest physiology and storage of carambola (starfruit) : a review
O'Hare, T. J. (1993). Postharvest physiology and storage of carambola (starfruit) : a review. Postharvest Biology and Technology, 2 (4) 257-267. doi:10.1016/0925-5214(93)90031-w
Conference Publication
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Differences in the anthocyanin profile of different tissues of the strawberry fruit
Hong, Hung T., Chen, Aiqi, Netzel, Michael E. and O’Hare, Tim J. (2020). Differences in the anthocyanin profile of different tissues of the strawberry fruit. Third International Tropical Agriculture Conference (TROPAG 2019), Brisbane, QLD, Australia, 11 - 13 November 2019. Basel, Switzerland :M D P I AG. doi: 10.3390/proceedings2019036074
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Agarwal, Rimjhim, Trieu, Hung Hong, Cave, Robyn, Harper, Stephen and O’Hare, Tim (2020). Orange capsicums and chillies as a potential source of dietary zeaxanthin, an important macular carotenoid for eye health. Third International Tropical Agriculture Conference (TROPAG 2019), Brisbane, QLD Australia, 11-13 November 2019. Basel, Switzerland :MDPI AG. doi: 10.3390/proceedings2019036161
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Purple sweetcorn—an innovative horticultural product—consumer views
Mantilla, Sandra Milena Olarte, Lyons, Philippa, O'Hare, Tim J. and Smyth, Heather Eunice (2020). Purple sweetcorn—an innovative horticultural product—consumer views. Third International Tropical Agriculture Conference (TROPAG 2019), Brisbane, QLD, Australia, 11–13 November 2019. Basel, Switzerland :MDPI AG. doi: 10.3390/proceedings2019036102
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Super-sweet purple sweetcorn: breaking the genetic link
Anirban, Apurba and O’Hare, Tim (2020). Super-sweet purple sweetcorn: breaking the genetic link. Third International Tropical Agriculture Conference (TROPAG 2019), Brisbane, QLD, Australia, 11–13 November 2019. Basel, Switzerland :MDPI AG. doi: 10.3390/proceedings2019036134
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Kodagoda, Gethmini, Netzel, Michael E., Sultanbawa, Yasmina, O’Hare, Tim and T. Hong, Hung (2020). The effect of post-harvest storage on the physicochemical properties and phytochemical content of Queen Garnet plum. TropAg2019, International Tropical Agriculture Conference, Brisbane, QLD, Australia, 11 - 13 November 2019. Basel, Switzerland :M D P I AG. doi: 10.3390/proceedings2019036099
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The inside and out of folate in strawberries and avocados
Netzel, Michael E., Dumler, Caroline, Weber, Nadine, Striegel, Lisa, Rychlik, Michael, Hong, Hung T. and O’Hare, Tim (2020). The inside and out of folate in strawberries and avocados. Third International Tropical Agriculture Conference (TROPAG 2019), Brisbane, Australia, 11–13 November 2019. Basel, Switzerland :MDPI AG. doi: 10.3390/proceedings2019036086
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Netzel, Michael, Zeilmann, Theresa, Fanning, Kent, Rychlik, Michael and O'Hare, Tim (2019). Biofortified sweet corn - a promising dietary source of zeaxanthin for age-related macular degeneration. 42nd Annual Scientific Meeting of the Nutrition Society of Australia, Canberra, ACT, Australia, 27-30 November 2018. MDPI.
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Folate in strawberry and avocado – profile, distribution and total content
Dumler, Caroline, Weber, Nadine, Striegel, Lisa, Rychlik, Michael, Hong, Hung, O'Hare, Tim and Netzel, Michael (2019). Folate in strawberry and avocado – profile, distribution and total content. 4th Queensland Annual Chemistry Symposium QACS 2019, Brisbane, QLD, Australia, 29 November 2019.
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Hong, Hung, Agarwal, Rimjhim, Netzel, Michael and O'Hare, Tim (2019). Optimisation of extraction and saponification for the determination of free- and bound-carotenoids in orange capsicum and avocado. 4th Queensland Annual Chemistry Symposium QACS 2019, Brisbane, QLD, Australia, 29 November 2019.
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Strawberries - an underestimated dietary source of folate
Netzel, Michael, Weber, Nadine, Dumler, Caroline, Striegel, Lisa, Phan, Anh, Trieu, Hung, Rychlik, Michael and O'Hare, Tim (2019). Strawberries - an underestimated dietary source of folate. 42nd Annual Scientific Meeting of the Nutrition Society of Australia, Canberra, ACT, Australia, 27-30 November 2018. MDPI.
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Kodagoda, Gethmini, Hong, Hung, Topp, Bruce, Sultanbawa, Yasmina, O'Hare, Tim and Netzel, Michael (2019). The effect of storage temperature on the accumulation of anthocyanins in different fruit tissues of Queen Garnet Plum. 4th Queensland Annual Chemistry Symposium QACS 2019, Brisbane, QLD, Australia, 29 November 2019.
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The relationship between bulb yield and allicin concentration in garlic varieties
Nguyen, Binh, Wehr, Bernhard, O’Hare, Timothy, Hong, Hung, Menzies, Neal and Harper, Stephen (2019). The relationship between bulb yield and allicin concentration in garlic varieties. Third International Tropical Agriculture Conference (TROPAG 2019), Brisbane, QLD, Australia, 11 - 13 November 2019. Basel, Switzerland :M D P I AG. doi: 10.3390/proceedings2019036028
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B14 - Strawberries – Higher in folate than previously thought!
Netzel, Michael E., Weber, Nadine, Dumler, Caroline, Striegel, Lisa, Phan, Anh D. T., Trieu, Hung H., Rychlik, Michael and O'Hare, Tim (2018). B14 - Strawberries – Higher in folate than previously thought!. 3rd Queensland Annual Chemistry Symposium QACS 2018, Brisbane, QLD, Australia, 23 November 2018.
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Hong, Trieu, Netzel, Michael E. and O'Hare, Tim J. (2018). B16 - The effect of physiological maturity and different cooking methods on anthocyanin accumulation in purple sweetcorn kernels. 3rd Queensland Annual Chemistry Symposium QACS 2018, Brisbane, QLD, Australia, 23 November 2018.
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Hong, Hung T., Netzel, Michael E. and O'Hare, Tim J. (2018). Extraction efficiency and stability of anthocyanins using acidified extraction solvents and UHPLC-PDA-MS/MS. 3rd Queensland Mass Spectrometry Symposium, Brisbane, QLD, Australia, 6-7 December 2018.
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Naturally Nutritious – Development of the Alpha Strawberry Packed With Folate
Netzel, Michael, O'Hare, Tim and Rychlik, Michael (2018). Naturally Nutritious – Development of the Alpha Strawberry Packed With Folate. Launch of the Australia-Germany Research Network at the Australian Embassy in Berlin, Berlin, Germany, 20 Novemeber 2018.
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Purple sweetcorn – something tasty and healthy?
O'Hare, Tim J., Netzel, Michael E. and Hong, H. T. (2018). Purple sweetcorn – something tasty and healthy?. 30th International Horticultural Congress, Istanbul, Turkey, 12-16 August 2018.
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Zeaxanthin-biofortified popcorn: stability of carotenoids following microwave popping
O'Hare, T. J. and de Souza, Sarzi B. (2018). Zeaxanthin-biofortified popcorn: stability of carotenoids following microwave popping. Bon Conference, Cambridge, United Kingdom, 11-13 July 2018. Amsterdam, The Netherlands :IOS PRESS.
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Determination of pigments of purple sweetcorn using LC-PDA-MS/MS
Hong, Hung Trieu, Netzel, Michael E., Netzel, Gabriele and O'Hare, Tim J. (2017). Determination of pigments of purple sweetcorn using LC-PDA-MS/MS. 2nd Queensland Annual Chemistry Symposium QACS 2017, Brisbane, QLD, Australia, 27 November 2017.
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Calvo, P., Shelat, K., Sultanbawa, Y. and O'Hare, T. (2017). Effect of Postharvest Cool Storage on Carotenoid Content of Zeaxanthin Biofortified and Standard Yellow Sweet Corn. TropAg2017, International Tropical Agriculture Conference, Brisbane, Qld, Australia, 20-22 November 2017. Lausanne, Switzerland :Frontiers.
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Identification of purple anthocyanin pigments from purple sweetcorn using LC-PDA-MS/MS
Hong, H. T., Netzel, M. E., Netzel, G., Giles, C. and O'Hare, T. J. (2017). Identification of purple anthocyanin pigments from purple sweetcorn using LC-PDA-MS/MS. 2nd Queensland Mass Spectrometry Symposium, Brisbane, QLD, Australia, 2-3 November 2017.
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Preliminary investigation of chemical composition of Zinggiber cassumunar. Roxb in Kon Tum Province
Hong Trieu, Hung, Netzel, Michael E., Netzel, Gabriele and O’Hare, Tim J. (2017). Preliminary investigation of chemical composition of Zinggiber cassumunar. Roxb in Kon Tum Province. Extraction efficiency and stability of anthocyanins using acidified extraction solvents and UHPLC-PDA-MS/MS, QIMR, 2 November 2017.
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The Effect of Physiological Maturity on the Anthocyanin Profile of Purple Sweet Corn
Hong, H., Netzel, M., Netzel, G. and O'Hare, T. J. (2017). The Effect of Physiological Maturity on the Anthocyanin Profile of Purple Sweet Corn. TropAg2017, International Tropical Agriculture Conference, Brisbane, Qld, Australia, 20-22 November 2017.
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Impact of Zeaxanthin Concentration On its Bioaccessibility in Biofortified Sweet Corn
Zeilmann, T., Fanning, K. J., Technische, Rychlik M., Netzel, M. E. and O'Hare, T. J. (2015). Impact of Zeaxanthin Concentration On its Bioaccessibility in Biofortified Sweet Corn.
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Benzyl isothiocyanate: maximising production in papaya tissue extracts
Williams, D. J., Pun, S., Alotaibi, N., O’Hare, T. J. and Sultanbawa, Y. (2015). Benzyl isothiocyanate: maximising production in papaya tissue extracts. International Horticultural Congress, Brisbane, QLD, Australia, 17-22 August 2014. Leuven, Belgium :International Society for Horticultural Science. doi: 10.17660/ActaHortic.2015.1106.16
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Biofortification of vegetables for the developed world
O'Hare, T. J. (2015). Biofortification of vegetables for the developed world. XXIX International Horticultural Congress on Horticulture: Sustaining Lives, Livelihoods and Landscapes (IHC2014), Brisbane, Australia, 17-22 August 2014. Leuven, Belgium :International Society for Horticultural Science. doi: 10.17660/ActaHortic.2015.1106.1
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O'Hare, T. J., McGrath, D. J., Dillon, N. L. and Walker, I. O. (2015). Colour differentiation of high-lycopene tomato fruit through the addition of the colourless-epidermis (y) mutation. XXIX International Horticultural Congress on Horticulture: Sustaining Lives, Livelihoods and Landscapes (IHC2014), Brisbane, Australia, 17-22 August 2014. Leuven, Belgium :International Society for Horticultural Science. doi: 10.17660/ActaHortic.2015.1106.2
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Freezing induces reversible colour-change in both zeaxanthin-biofortified and yellow sweet-corn
O'Hare, T. J., Calvo-Brenes, P., Fanning, K. and Pun, S. (2015). Freezing induces reversible colour-change in both zeaxanthin-biofortified and yellow sweet-corn. XXIX International Horticultural Congress on Horticulture: Sustaining Lives, Livelihoods and Landscapes (IHC2014), Brisbane, QLD, Australia, 17-22 August 2014. Leuven, Belgium :International Society for Horticultural Science. doi: 10.17660/ActaHortic.2015.1106.12
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O'Donoghue, A., O'Hare, T. J., Zhang, B. and Fanning, K. (2015). The impact of lycopene and non-lycopene-containing tomato extracts on in vitro prostate cancer cell growth. XXIX International Horticultural Congress on Horticulture: Sustaining Lives, Livelihoods and Landscapes (IHC2014), Brisbane, Australia, 17-22 August 2014. Leuven, Belgium :International Society for Horticultural Science. doi: 10.17660/ActaHortic.2015.1106.23
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Calvo, P., Fanning, K. J., Shelat, K. and O'Hare, T. J. (2015). Tweaking nature: Zeaxanthin and lutein concentration in sweet corn can be modified by genotype, physiologic maturity, and location on the cob. Macular Carotenoids Conference 2015, Cambridge, United Kingdom, July 8-10, 2015. London, United Kingdom :Sage Publications. doi: 10.5301/ejo.5000635
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New strawberry breeding lines – enhanced phytochemical composition and bioaccessibility
Zeilmann, Theresa, Netzel, Michael, Herrington, Mark, Rychlik, Michael, O'Hare, Tim and Fanning, Kent (2014). New strawberry breeding lines – enhanced phytochemical composition and bioaccessibility. 38th Annual Scientific Meeting of the Nutrition Society of Australia, Hobart, TAS Australia, 26 - 28 November 2014. Amsterdam, The Netherlands :Elseiver.
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O'Hare, T. J., Martin, I., Fanning, K. J., Kirchhoff, S., Wong, L. S., Keating, V., Pun, S. and Reid, C. (2014). Sweetcorn colour change and consumer perception associated with increasing zeaxanthin for the amelioration of age-related macular degeneration. III International Symposium on Human Health Effects of Fruits and Vegetables (FAVHEALTH 2009), Avignon, France, 18-21 October 2009. Leuven, Belgium :International Society for Horticultural Science. doi: 10.17660/ActaHortic.2014.1040.28
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Zeaxanthin-Biofortified Sweet-Corn as An Enhanced Dietary Source of Macular Pigment
O'Hare, Tim J., Fanning, Kent, Martin, Ian, Pun, Sharon, Zeppa, Aldo and Fekybelu, Solomon (2013). Zeaxanthin-Biofortified Sweet-Corn as An Enhanced Dietary Source of Macular Pigment. Macular Carotenoids Conference, Cambridge, England, 10 - 12 July 2013. Milan, Italy :Wichtig Publishing. doi: 10.5301/EJO.2013.11169
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Carotenoids as potential indicators of food quality and nutrition
Pun, Sharon, Paulo, Carl, Wong, Lung, Torrisi, Caterina, Poole, Sue, O'Hare, Tim, Martin, Ian and Fanning, Kent (2012). Carotenoids as potential indicators of food quality and nutrition. 12th Government Food Analysts Conference (GFAC), Brisbane, Australia, 22-24 February 2011.
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Microbiological assay for folate content: limitations and improvements
Houlihan, Avis, Pyke, Matthew, Graham, Glenn, Puwastien, Prapasri, Wasinee, Jongjitsin, Eaglesham, Geoffrey, O'Hare, Timothy, Wong, Lung and Scheelings, Pieter (2012). Microbiological assay for folate content: limitations and improvements. 12th Government Food Analysts Conference, Brisbane, Australia, 22-24 February 2011. Coopers Plains, QLD, Australia :Health and Food Sciences Precinct (HFSP).
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Oxidative stress: not such a bad thing for the anti-cancer properties of broccoli sprouts
Williams, David, Pun, Sharon, O'Hare, Timothy and Christley, Christa (2012). Oxidative stress: not such a bad thing for the anti-cancer properties of broccoli sprouts. 12th Government Food Analysts Conference (GFAC), Brisbane, Australia, 22-24 February 2011.
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Enhancing zeaxanthin concentration in sweetcorn for ameliorating age-related macular degeneration
Fanning, K. J., Fekybelu, S., Holton, T., Innes, D., Keating, V., Martin, I., O'Hare, T. J., Pun, S., Wong, L. S. and Zeppa, A. (2010). Enhancing zeaxanthin concentration in sweetcorn for ameliorating age-related macular degeneration. Gordon Carotenoid Conference, Ventura Beach, California, 17-22 January 2010.
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Glucosinolate composition and anti-cancer potential of daikon and radish sprouts
O'Hare, Tim J., Wong, Lung S., Force, Lesleigh E., Williams, David J., Gurung, Chandra B. and Irving, Donald E. (2008). Glucosinolate composition and anti-cancer potential of daikon and radish sprouts. 27th International Horticultural Congress on Plants as Food and Medicine, Seoul, South Korea, 13-19 August 2006. Leuven, Belgium :International Society for Horticultural Science. doi: 10.17660/ActaHortic.2008.765.29
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O'Hare, T. J., Wong, L. S., Force, L. E. and Irving, D. E. (2007). Glucosinolate composition and anti-cancer potential of seed-sprouts from horticultural members of the Brassicaceae. 1st International Symposium on Human Health Effects of Fruits and Vegetables, Quebec, Canada, 17-20 August 2005. Leuven, Belgium :International Society for Horticultural Science. doi: 10.17660/ActaHortic.2007.744.18
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Asian and western horticultural species of the brassica family with anti-cancer potential
O'Hare, T. J., Wong, L.S. and Irving, D. (2005). Asian and western horticultural species of the brassica family with anti-cancer potential. Int. Symposium on Harnessing the Potential of Horticulture in the Asian-Pacific, Coolum, Australia, 1-3 September, 2004. Belgium :International Society for Horticultural Science.
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Increasing visual appeal and health benefit of fresh-cut tomato slices using high-lycopene varieties
O'Hare, T. J., Wong, L. S. and McGrath, D. J. (2005). Increasing visual appeal and health benefit of fresh-cut tomato slices using high-lycopene varieties. International Conference on Postharvest Unlimited Downunder 2004, Sydney Australia, 09-12 November 2004. Leuven, Belgium :International Society for Horticultural Science.
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Teixeira, G. H. A, Durigan, J. F., Alves, R. E. and O'Hare, T. J. (2005). Use of Carambola (Averrhoa carambola L. 'Fwang Tung') fruit at two stages of maturity for fresh-cut products. 5th International Postharvest Symposium, Verona Italy, 06-11 June 2004. Leuven, Belgium :International Society for Horticultural Science.
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1-methylcyclopropene delays softening in tomato slices
Pangaribuan, D. H., Irving, D. and O'Hare, T. J. (2003). 1-methylcyclopropene delays softening in tomato slices. Australasian Postharvest Horticulture Conference, Brisbane, Australia, 1-3 October, 2003.
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Changes in ascorbic acid and lycopene during storage of tomato slices
Pangaribuan, D. H., Irving, D. and O'Hare, T. J. (2003). Changes in ascorbic acid and lycopene during storage of tomato slices. Food Safety, Quality Assurance & Env. Sustainability, Nusa Dua, Bali, Indonesia, 23-26 August, 2003.
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Effect of an ethylene absorbent on quality of tomato slices.
Pangaribuan, D. H., Irving, D. and O'Hare, T. J. (2003). Effect of an ethylene absorbent on quality of tomato slices.. Australasian Postharvest Horticulture Conference, Brisbane, Australia, 1-3 October, 2003.
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Pangaribuan, D. H., Irving, D. and O'Hare, T. J. (2003). Effect of fruit maturity and storage temperature on the postharvest physiology of fresh-cut tomato slices. Food Safety, Quality Assurance & Env. Sustainability, Nusa Dua, Bali, Indonesia, 23-26 August, 2003.
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Exposure of tomator fruit to 1-MCP improves quality of stored slices
Pangaribuan, D. H., Irving, D. and O'Hare, T. J. (2003). Exposure of tomator fruit to 1-MCP improves quality of stored slices. Australasian Postharvest Horticulture Conference, Brisbane, Australia, 1-3 October, 2003.
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The effect of slicing on the C2H4 and CO2 production of tomato slices.
Pangaribuan, D. H., Irving, D. and O'Hare, T. J. (2003). The effect of slicing on the C2H4 and CO2 production of tomato slices.. Food Safety, Quality Assurance & Env. Sustainability, Nusa Dua, Bali, Indonesia, 23-26 August, 2003.
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Fresh cut tomato slices: Temperature and Maturity
Pangaribuan, D. H., Porter, G. W., Irving, D. and O'Hare, T. J. (2002). Fresh cut tomato slices: Temperature and Maturity. AUSHS Conference, The University of Sydney, Australia, 29 September to 2 October, 2002. Sydney :The University of Sydney.
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The Physiology of Fresh-cut Tomato Slices
Pangaribuan, D. H., Porter, G. W., Irving, D. and O'Hare, T.J. (2002). The Physiology of Fresh-cut Tomato Slices. AuSHS Conference Sydney, Sydney, Australia, 29 September to 2 October, 2002. Sydney :The University of Sydney.
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The development of blackheart resistant pineapples through genetic engineering
Graham, M., Ko, L., Hardy, V., Robinson, S., Sawyer, B., O'Hare, T., Jobin, M., Dahler, J., Underhill, S. and Smith, M. (2000). The development of blackheart resistant pineapples through genetic engineering. 3rd International Pineapple Symposium, Pattaya Thailand, 17-20 November 1998. LEUVEN 1 :INTERNATIONAL SOCIETY HORTICULTURAL SCIENCE. doi: 10.17660/ActaHortic.2000.529.15
Edited Outputs
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Tim J. O'Hare and Michael E. Netzel ed. (2015). Acta Horticulturae 1106: Proceedings of the VI International Symposium on Human Health Effects of Fruits and Vegetables - FAVHEALTH2014. VI International Symposium on Human Health Effects of Fruits and Vegetables - FAVHEALTH2014, Brisbane Australia, 17-22 August 2014.Leuven, Belgium :ISHS.
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Postharvest handling of fresh vegetables
T. O'Hare, J. Bagshaw, Li Wu and G.I. Johnson ed. (2001). Postharvest handling of fresh vegetables. ACIAR Proceedings No. 105, Beijing, China, 9-11 May 2001.Canberra, Australia :Australian Centre for International Agricultural Research.
Grants (Administered at UQ)
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Understanding the distribution of Zn in sweetcorn kernels for improving human nutrition
(2017) Australian Synchrotron Access Program (ANSTO)
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(2016–2021) Horticulture Innovation Australia Limited
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(2015–2018) Queensland Department of Agriculture and Fisheries
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Native plant extracts for extended shelf life in corn
(2014–2016) Rural Industries Research & Development Corporation
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Optimisation of high-lycopene tomatoes for tropical conditions
(2014–2016) Horticulture Australia Limited
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Feasibility and opportunities for Peruvian purple corn in Australia
(2014–2015) Rural Industries Research & Development Corporation
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Developing 'superyellow' enhanced pigment sweetcorn for eye-health (HAL project)
(2010–2015) Queensland Department of Agriculture, Fisheries and Forestry
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Developing tropically-adapted high-lycopene tomatoes for the Australian market (HAL project)
(2010–2013) Horticulture Australia Limited
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(2010–2011) Queensland Department of Employment, Economic Development and Innovation
PhD and MPhil Supervision
Current Supervision
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Assessing the bioactivity of tomato extracts from varieties with unique carotenoid profiles on human in vitro prostate cancer cell lines
Doctor Philosophy — Principal Advisor
Other advisors:
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Endogenous fatty acid desaturation of palmitic to palmitoleic acid in macadamia kernel tissue.
Doctor Philosophy — Principal Advisor
Other advisors:
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Identification of genetic variants in orange-pigmented capsicum and chillli of the Capsicum annuum, C. chinense, and C. baccatum species.
Doctor Philosophy — Principal Advisor
Other advisors:
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Genetic factors affecting anthocyanin development in purple-pericarp sweetcorn
Doctor Philosophy — Principal Advisor
Other advisors:
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Assessment of the nutritional quality of Australian grown Plumcot
Doctor Philosophy — Associate Advisor
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Genetic and agronomic biofortification of zinc in sweetcorn
Doctor Philosophy — Associate Advisor
Other advisors:
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Determining the nutritional and wellness compounds that can be found in an Australian medicinal bush food plant
Doctor Philosophy — Associate Advisor
Other advisors:
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Evaluation of nutritional, genotypic and environmental factors affecting the yield and quality of garlic.
Doctor Philosophy — Associate Advisor
Other advisors:
Completed Supervision
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Factors affecting carotenoids in zeaxanthin-biofortified sweet-corn (Zea mays L.)
(2019) Doctor Philosophy — Principal Advisor
Other advisors:
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(2010) Doctor Philosophy — Associate Advisor
