Discrete charge carrier transfer sites on proteins? A D.C. conductivity study on ultrathin protein films |
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| Authors: | B Karvaly J Jankun S Trivedi B Mallik G Kemeny |
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| Institution: | 1. Department of Chemistry, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh;2. Department of Chemistry, Jashore University of Science and Technology, Jashore 7408, Bangladesh;3. Department of Food Science and Nutrition, College of Food and Agricultural Sciences, King Saud University, Riyadh 11451, Saudi Arabia;4. Laboratory for Chemical Computation and Modeling, Institute for Computational Science and Artificial Intelligence, Van Lang University, Ho Chi Minh City, Viet Nam;5. Faculty of Applied Technology, School of Technology, Van Lang University, Ho Chi Minh City, Viet Nam;6. Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia;7. Department of Biological and Physical Sciences, South Carolina State University, Orangeburg, SC 29117, USA;8. Department of Chemistry, Jagannath University, Dhaka 1100, Bangladesh |
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| Abstract: | D.C. electrical conduction in thin protein films (200 mg/cm2; approximately 2 mu in thickness) of bovine serum albumin and its dinitrophenylated derivatives with different stoichiometric composition was investigated at 17, 20 and 23% relative humidities and at room temperature. Statistically significant decrease in conductivity due to derivatization was observed even at protein-2,4-dinitrophenol stoichiometry as low as 1:2. A charge injection mechanism based upon discrete charge carrier transfer sites could account for the observations. Analogous events may operate in cellular signaling and coding. |
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