Spontaneous formation of an electroactive co-polymeric film derived from nordihydroguaiaretic acid and 4,4′-diaminobibenzyl |
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| Institution: | 1. State Key Lab of Separation Membrane and Membrane Process, Tiangong University, No. 399, Binshuixi Road, Tianjin, 300387, China;2. School of Chemistry and Chemical Engineering, Tiangong University, No. 399, Binshuixi Road, Tianjin, 300387, China;3. School of Environmental Science and Engineering, Tiangong University, No. 399, Binshuixi Road, Tianjin, 300387, China;1. Ministry of Agriculture – Laboratory of Quality & Safety Risk Assessment for Dairy Products (Beijing), Beijing, China;2. College of Food Science and Engineering, Qingdao Agricultural University, Qingdao, Shandong, China;3. Ministry of Agriculture – Milk and Dairy Product Inspection Center (Beijing), Beijing, China;4. State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China;1. JNU-UPM International Joint Laboratory on Plant Oil Processing and Safety, Department of Food Science and Engineering, Jinan University, Guangzhou, Guangdong 510632, China;2. National R&D Center for Freshwater Fish Processing, Jiangxi Normal University, Nanchang, Jiangxi 330022, China;1. Science Research Center, Organization for Research Initiatives, Yamaguchi University, Yoshida 1677-1, Yamaguchi 753-8515, Japan;2. Graduate School of Sciences and Technologies for Innovation, Yamaguchi University, Yoshida 1677-1, Yamaguchi 753-8515, Japan;3. Faculty of Agriculture, Yamaguchi University, Yoshida 1677-1, Yamaguchi 753-8515, Japan;4. Faculty of Science, Yamaguchi University, Yoshida 1677-1, Yamaguchi 753-8512, Japan |
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| Abstract: | Binary solution of nordihydroguaiaretic acid (NDGA) and 4,4′-diaminobibenzyl (DABB) undergoes rapid oxidation by ambient oxygen to form a thin film of poly-NDGA-co-DABB on the surface of the reaction chamber and on immersed substrates. Electrochemistry of thus formed films was studied in 0.1 M sulfuric acid and in phosphate buffer (pH 7.4). Electrochemical behavior of the co-polymeric film is characterized by two redox couples, the predominant one being observed at more negative potentials comparing to parent NDGA i.e. 0.28 vs. 0.49 V (vs. Ag/AgCl) in 0.5 M H2SO4. The peak potentials were shifted toward lower values with solution pH at the rate of 59 mV/pH unit indicating a 2e/2H+ transition as expected for quinone-containing films. The poly-NDGA-co-DABB film exhibits catalytic activity toward electroreduction of nitrite to nitric oxide in acidic electrolytes. This reaction can be used to quantify nitrite in a broad concentration range with low detection limit (0.3 μM, S/N = 3). |
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