PMID- 9885272 OWN - NLM STAT- Publisher LR - 20191120 IS - 1095-7103 (Electronic) IS - 0021-9797 (Linking) VI - 209 IP - 2 DP - 1999 Jan 15 TI - Fabrication and Electrochemical Behavior Investigation of a Polypyrrole/4-Hydroxy-6-methyl-2-mercaptopyrimidine Comodified Gold Electrode. PG - 421-427 AB - A polypyrrole (PPy)/4-hydroxy-6-methyl-2-mercaptopyrimidine (HMMP) comodified gold electrode was prepared and characterized in the form of PPy/HMMP/Au. The polymerization mechanisms of pyrrole on a bare Au electrode, a dodecanethiol-modified gold electrode, and a HMMP/Au electrode are compared and discussed. With ascorbic acid as a probe, various factors affecting the electrochemical characteristics of the PPy/HMMP/Au electrode are investigated. The catalytic activity for the electrochemical oxidation of l-ascorbic acid was studied in 0.1 mol. L-1 NaCl and 1.0 x 10(-3) mol. L-1 HCl. Both the kinetics of oxidation and the reproducibility of the electrochemical response are enhanced at the comodified electrode compared to that of an unmodified metal electrode or the PPy/Au electrode in determination of ascorbic acid. Copyright 1999 Academic Press. FAU - Chen, M AU - Chen M AD - Department of Chemistry, Lanzhou University, Lanzhou, 730000, China FAU - Nie, MY AU - Nie MY FAU - Li, HL AU - Li HL LA - eng PT - Journal Article PL - United States TA - J Colloid Interface Sci JT - Journal of colloid and interface science JID - 0043125 EDAT- 1999/01/14 00:00 MHDA- 1999/01/14 00:00 CRDT- 1999/01/14 00:00 PHST- 1999/01/14 00:00 [pubmed] PHST- 1999/01/14 00:00 [medline] PHST- 1999/01/14 00:00 [entrez] AID - S0021-9797(98)95913-6 [pii] AID - 10.1006/jcis.1998.5913 [doi] PST - ppublish SO - J Colloid Interface Sci. 1999 Jan 15;209(2):421-427. doi: 10.1006/jcis.1998.5913.