Omowunmi A. Sadik

Dr. Omowunmi A. Sadik

Professor of Bioanalytical and Environmental Chemistry

  • Ph.D., University of Wollongong, Australia
Science 2 Bldg - Room 708
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Research Interests:

A core objective of my research program is to understand the mechanism of the transduction of chemical information at interfaces, and to use this knowledge in the pursuit of innovative biosensing technologies, functional materials and devices. A sensor is a device that responds to physical, chemical or biological quantity, and converts that quantity into a signal or an output. The driving force behind my biosensor research is the need to build sensor systems that quantitatively measure target species in a complex system. I have developed innovative biosensors for ultrasensitive detection of Staphylococci Enterotoxin B (SEB), biofilm, DNA mismatch, pain biomarkers, oral proteins, E. coli, Bacillus globigii, chromium VI, polychlorinated biphenyls, environmental pollutants and toxic metals.

Aside from biosensors, I have also established a world-class research in functional materials. Examples include polyphenols, polyamic acid nanomembranes, polyoxy-dianilines, and sequestered metal nanoparticles within electroconducting polypyrrole. I have been recognized for my research and development of nano-bioanalytical detection platforms for environmental and biological monitoring. Our current sensors incorporate transducers and sustainable membranes utilizing complementary physical, chemical, and biological phenomena to measure orthogonal characteristics of chemical or biological species of interest.

Selected Publications:

Idris Yazgan, Naumih M. Noah, Ousmane Toure, Siyi Zhang and Omowunmi A. Sadik, Biosensor for selective detection of E. coli in spinach using the strong affinity of derivatized mannose with fimbrial lectin, Biosensors & Bioelectronics, 61, 266-273, 2014

Sadik O. A., Du N., Kariuki V., Okello V., & Bushlyar V., Current and Emerging Technologies for the Characterization of Nanomaterials, ACS Sustainable Chemistry & Engineering, 2014 (In Press)

H. Hess, T.W. Omowunmi A. Sadik, E.I. Iwuoha, P.G.L. Baker, Constitution of novel polyamic acid/polypyrrole composite films by in-situ electropolymerization, Electrochimica Acta 128, 439-447, 2014

Veronica A. Okello, Samuel Gass, Georgios Pyrgiotakis, Nian Du, Andrew Lake, Victor Kariuki, Philip Demokritou & Omowunmi A. Sadik, Capture, Isolation and Electrochemical Detection of Industrially-relevant Engineered Aerosol Nanoparticles using Poly (amic) acid, Phase-inverted, Nano-membranes, Journal of Hazardous Materials, 2014 (accepted).

Idris Yazgan, Nian Du, Robert Congdon, Veronica Okello, Omowunmi A. Sadik , Biofunctionalized Poly (amic) Acid Membranes for Absolute Disinfection of Drinking Water, Journal of Membrane Science, 2014 (In Press).

Sadik, Omowunmi; Noah, Naumih, Catalytic reduction of hexavalent chromium using palladium nanoparticles: an undergraduate nanotechnology laboratory, Journal of Chemical Education,  91(2), 269-273, 2014

Robert Congdon Alexander Feldberg, Natalie Ben-Yakar, Dennis McGee, Omowunmi Sadik, Christopher Ober, Bahgat Sammakia, Early Detection of C. Albicans Biofilms at porous electrodes, Analytical Biochemistry, 433, 192-201, 2013

S. Tong, M. Tong, C. Twigg, Y. Chen, and O. Sadik, "Energy Efficient Control for Smart Wastewater Treatment Plants using Self-Powered Wireless Sensor Networks," Sensor Letters, 11 (9), 1689-1694, 2013

William Ford, Kun Xiang, Walker Land, Robert Congdon, Yinglei Li, Omowunmi Sadik, A Multi-class Probabilistic Neural Network for Pathogen Classification, Procedia Computer Science, 20, 348-353, 2013.

Zheng, L.Y.; Congdon, R.B.; Sadik, O.A.; Marques, C.N.H.; Davies, D.G.; Sammakia, B.G.; Lesperance, L.M.; Turner, J.N. Electrochemical Measurements of Biofilm Development using Polypyrrole-enhanced Flexible Sensors, Sensors & Actuators: B. Chemical, vol. 182 June, 725-732, 2013.

Veronica A. Okello, Ailing Zhou, Jane Chong, Michael T. Knipfing, David Doetschman & Omowunmi A. Sadik, Reduction of Hexavalent Chromium using Naturally-derived Flavonoids, Environmental Science & Technology, 46 (19), 10743–10751, 2012.

Marcells Omole, Veronica Okello, Vincent Lee, Lisa Zhou and Omowunmi Sadik, Catalytic Reduction of Hexavalent Chromium using Nanostructured Polyamic Acid, ACS Catalysis, 1, 139-146, 2011.

Kikandi S. K., Wong Q., Okello V., Sadik O. A., Varner V. E., Burns S., Size-exclusive Nanosensor for Quantitative Analysis of Fullerene Nanomaterials, Environmental Science & Technology, 45(2), 5294-5300, 2011.

Du N., Wong C., Feurstein, M., Sadik O., Umbach C., Sammakia B., Flexible Conducting Polymers: Effects of Chemical Composition on Structural, Electrochemical and Mechanical Properties, Langmuir, 26, 14194-14202, 2010.

Samuel K. Mwilu, Austin O. Aluoch, Seth Miller, Paula Wong & Omowunmi A. Sadik, Alim Fatah, Richard Arcilesi, Identification and Quantitation of Bacillus globigii using Metal-enhanced electrochemical detection and capillary biosensor, Analytical Chemistry, 81, 7561-7570, 2009.

Sadik O. A., Zhou Ailing, Aluoch A., Status of Biomolecular Recognition using Electrochemical Techniques,  Biosensors & Bioelectronics, 24, 2749-2765, 2009.

Breimer M., Yevgheny E., Sadik O. A., “Incorporation of Metal Particles in Polymerized Organic Conducting Polymers - A Mechanistic Insight,” Nano Letters, 1 (6), 305, 2001.

Zhou, S. Kikandi, O. A. Sadik, “Electrochemical Degradation of Quercetin: Isolation and Structural Elucidation of the Degradation Products”, Electrochemistry Communications, 9, 2247–2256, 2007.

Last Updated: 7/7/14