Dr Annette Dexter

Senior Lecturer

School of Agriculture and Food Sciences
Faculty of Science
a.dexter@uq.edu.au
0431174874

Overview

Dr Annette Dexter is a founder and ongoing consultant to AIBN’s first start-up company, Pepfactants Pty Ltd. At the TechConnect Summit in Boston in 2006, Pepfactants received an Emerging Technology Award. Pepfactants also won the Queensland Government’s Best Technology Award and the UQ Business School Enterprize Competition in the same year. Dr Dexter is sole or joint inventor on three patents comprising the key intellectual property of Pepfactants. She has presented data at two National Meetings of the American Chemical Society, the seventh World Congress of Chemical Engineering and the Annual Meeting of the American Institute of Chemical Engineers. Reports in Australasian Science, New Scientist, Materials Today and The Economist have highlighted Dr Dexter’s work and a video of rapid-phase emulsion separation has been receiving hits on YouTube.

Research Impacts

Research

Design and bioproduction of helical peptides as functional surfactants and responsive gelling agents for cell growth and drug delivery. Specific ion effects in the control of self-assembling systems.

Dr Annette Dexter's work involves designing and testing peptides as green surfactants. She is a founding inventor of AIBN’s first start-up company, Pepfactants Pty Ltd, which has a focus on making and breaking foams and emulsions. To help apply the technology on a larger scale, Dr Dexter incorporates design elements in peptide sequences to facilitate their expression in bacteria, cleavage and isolation by low-cost methods and desirable final properties including solubility, surface activity and charge. There are potential applications in drug delivery; froth flotation; agrichemical formulations; and household and personal care and grooming. A sideline arising from the peptide surfactant work has been the discovery of a hydrogel potentially useful for cell growth and drug delivery.

Qualifications

  • Master of Science, University of Illinois
  • Doctor of Philosophy, University of Illinois

Publications

View all Publications

Publications

Journal Article

Conference Publication

  • Dexter, A. F. (2010). Specific ion effects in emulsion coalescence. In: ACS National Meeting Book of Abstracts. 240th ACS National Meeting and Exposition, Boston, MA United States, (). 22-26 August 2010.

  • Zhao, Chun-Xia, Miller, Erik, Cooper-White, Justin J., Dexter, Annette F. and Middelberg, Anton P. J. (2009). Interfacial elasticity affects droplet formation in microfluidic channels. In: 8th World Congress of Chemical Engineering, Montreal, Canada, (). 23 - 27 August, 2009.

  • Zhao, Chun-Xia, Rondeau, Elisabeth, Miller, Erik, Cooper-White, Justin J., Dexter, Annette F. and Middelberg, Anton P.J. (2009). The influence of interfacial viscoelasticity on droplet deformation in microchannels. In: WCCE8: 8th World Congress of Chemical Engineering, Montréal, QC, Canada, (1-2). 23-27 August 2009.

  • Dexter, Annette F. and Middelberg, Anton P. J. (2007). COLL 143-Short designed peptides as rapidly switchable surfactants. In: Abstracts of Papers of the American Chemical Society. , , (). .

  • Dexter, Annette F., Malcolm, Andrew S. and Middelberg, Anton P. J. (2007). COLL 384-Mixed systems based on a designed surfactant peptide. In: Abstracts of Papers of the American Chemical Society. , , (). .

  • Middelberg, Anton P. J., He, Lizhong, Dexter, Annette F., Shen, Hsin-hui, Holt, Stephen A. and Thomas, Robert K. (2007). Young's modulus of a switchable peptide film. In: Abstracts of Papers, 234th ACS National Meeting. Abstracts of Papers of the American Chemical Society, Boston, MA, United States, (). 19-23 August.

  • Middelberg, Anton P. J., He, Lizhong, Dexter, Annette F., Shen, Hsin-hui, Holt, Stephen A. and Thomas, Robert K. (2007). Young's modulus of a switchable peptide film. In: American Chemical Society 234th National Meeting & Exposition. American Chemical Society 234th National Meeting & Exposition, Boston, USA, (). 19-23 August, 2007.

  • Dexter, Annette F. and Middelberg, Anton P. J. (2006). COLL 545-Biocatalysis in a switchable peptide-stabilized emulsion. In: Abstracts of Papers of the American Chemical Society. , , (). .

  • Dexter, Annette F. and Middelberg, Anton P. J. (2006). ORGN 325-Self-assembly of stimuli-responsive peptide films at fluid-fluid interfaces. In: Abstracts of Papers of the American Chemical Society. , , (). .

  • Dexter, Annette F., Malcolm, Andrew S. and Middelberg, Anton P. J. (2006). PETR 159-A designed biosurfactant for reversible emulsification of crude oil. In: Abstracts of Papers of the American Chemical Society. , , (). .

  • Dexter, A. F., Malcolm, A. S. and Middelberg, A. P. J. (2006). A designed biosurfactant for reversible emulsification of crude oil. In: Proceedings of: 232nd ACS National Meeting. 232nd ACS National Meeting, San Francisco, Ca., U.S.A., (). 10-14 September 2006.

  • Dexter, A. F. and Middelberg, A. P. J. (2006). Biocatalysis in a switchable peptide-stabilized emulsion. In: Proceedings of: The 232nd ACS National Meeting. The 232nd ACS National Meeting, San Francisco, CA, U.S.A., (). 10-14 September 2006.

  • Malcolm, Andrew S., Dexter, Annette F. and Middelberg, Anton P. J. (2006). Characterisation of self-assembled protein films at the air-water interface using the cambridge interfacial tensiometer. In: 2006 AIChE Annual Meeting : conference proceedings. 2006 AIChE Annual Meeting, San Francisco, California, (). 12-17 November 2006.

  • Malcolm, A. S., Dexter, A. F. and Middelberg, A. P. J. (2006). Designed peptide surfactants form a stimuli-responsive film at the fluid-fluid interface. In: 2006 AIChE Annual Meeting : conference proceedings. 2006 AIChE Annual Meeting, San Francisco, California, (). 12-17 November 2006.

  • Dexter, A. F., He, L. Z., Middelberg, A. P. J. and Niebert, M. (2006). Engineering biomolecules into functional nanostructures. In: Symposium B: Bio-Nanotechnology, Nano-Medicine and Nanobionics. 2006 International Conference On Nanoscience and Nanotechnology (ICONN 2006), Brisbane, QLD, Australia, (). 3-7 July 2006.

  • Meetze, K., Middelberg, A. P. J. and Dexter, A. (2006). Pepfactants. In: Proceedings of: TechConnect Summit 2006. TechConnect Summit 2006, Boston, MA, U.S.A., (). 8-9 May 2006.

  • Malcolm, Andrew S., Dexter, Annette F. and Middelberg, Anton P. J. (2006). Peptide surfactants (Pepfactants) for switchable foams and emulsions. In: Asia-Pacific Journal of Chemical Engineering: CHEMECA 2006 Knowledge and Innovation. CHEMECA 2006 Knowledge and Innovation, Auckland, New Zealand, (362-367). 17-20 September 2006. doi:10.1002/apj.66

  • Malcolm, A. S., Dexter, A. F. and Middelberg, A. P. J. (2006). Peptide surfactants (Pepfactants®) for switchable control of foam and emulsion stability. In: 2006 AIChE Annual Meeting : conference proceedings. 2006 AIChE Annual Meeting, San Francisco, California, (). 12-17 November 2006.

  • Dexter, Annette F. and Middelberg, A.P.J. (2006). Peptide surfactants for switchable emulsions and foams. In: Proceedings of: Australia Brazil Bio Nano Technology Conference 2006. Australia Brazil Bio Nano Technology Conference 2006, Brisbane, Australia, (). 27-28 March 2006.

  • Dexter, A. F. and Middelberg, A. P. J. (2006). Self-assembly of stimuli-responsive peptide films at fluid-fluid interfaces. In: Proceedings of: The 232nd ACS National Meeting. The 232nd ACS National Meeting, San Francisco, CA, U.S.A., (). 10-14 September 2006.

  • Malcolm, Andrew S., Dexter, Annette F. and Middelberg, Anton P. J. (2006). Using nano-structured interfacial peptide films to create stimuli-responsive foams and emulsions. In: 2006 International Conference On Nanoscience and Nanotechnology, Vols 1 and 2. International Conference on Nanoscience and Nanotechnology, Brisbane Australia, (4-6). Jul 03-07, 2006.

  • Malcolm, Andrew S., Dexter, Annette F. and Middelberg, Anton P. J. (2006). Using nano-structured interfacial peptide films to create stimuli-responsive foams and emulsions. In: C. Jagadish and G. Q. Max Lu, Proceedings of the 2006 International Conference on Nanoscience and Nanotechnology (ICONN 2006). 2006 International Conference on Nanoscience and Nanotechnology (ICONN 2006), Brisbane, Qld., Australia, (239-241). 3-7 July 2006. doi:10.1109/ICONN.2006.340596

  • Dexter, A. F. and Middelberg, A. P. J. (2005). Force transmission by designed peptide ensembles at interfaces. In: 7th World Congress of Chemical Engineering incorporating the 5th European Congress of Chemical Engineering. 7th World Congress of Chemical Engineering incorporating the g, Glasgow, Scotland, (1-5). 10-14 July 2005.

  • Dexter, A. F. and Middelberg, A. P. J. (2005). Interfacial networks of amphipathic peptides. In: Dr M Hardin, 33rd Australasian Chemical Engineering Conference. CHEMECA 2005, Brisbane, Queensland, Australia, (1-4). 25-28 September 2005.

  • Dexter, A. F. and Middelberg, A. P. J. (2005). Reversible switching of a designed peptide film at fluid-fluid interfaces. In: Proceedings of: 2005 Sir Mark Oliphant Conference: BioNano: The Next Frontier. 2005 Sir Mark Oliphant Conference: BioNano: The Next Frontier, Brisbane, Australia, (). 4-7 December 2005.

  • Middelberg, Anton and Dexter, Annette (2005). Stimuli-responsive biomolecular interfacial architectures for emulsion technology. In: Proceeding of: 13th Foresight Conference on Advanced Nanotechnology. Advancing Beneficial Nanotechnology: Focusing on the Cutting Edge: 13th Foresight Conference on Advanced Nanotechnology, San Francisco, U.S., (). 22-27 October, 2005.

  • Dexter, AF, Xia, YM, Debrunner, G and Hager, LP (1995). Electron-Paramagnetic-Resonance of Allylbenzene-Inactivated Chloroperoxidase and a Possible Intermediate in Reactivation. In: Faseb Journal. , , (A1326-A1326). .

Grants (Administered at UQ)

PhD and MPhil Supervision

Completed Supervision