Ferreira, V. S.Melios, C. B.Zanoni, Maria Valnice Boldrin [UNESP]Stradiotto, Nelson Ramos [UNESP]2014-05-202014-05-201996-02-01Analyst. Cambridge: Royal Soc Chemistry, v. 121, n. 2, p. 263-267, 1996.0003-2654http://hdl.handle.net/11449/39030The differential pulse polarographic behaviour of cinnamic acid was studied in acetate and phosphate buffer solutions (pH 3.5-7.5). The reduction mechanism is discussed. The drug can be determined at pH 5.0 over the concentration range 5 X 10(-5)-1 X 10(-3) mol l(-1). The effect of tetraalkylammonium salts on the electroanalytical determination of cinnamic acid was investigated, the direct determination of the drug (0.7-5.5 mu g ml(-1)) in urine samples diluted with acetate buffer (pH 5.0) can be effected in the presence of 1 x 10(-3) mol l(-1) cetyldimethylethylammonium bromide solution. The detection limit was found to be 0.1 mu g ml(-1). The relative standard deviation from six determinations at the 5.5 mu g ml(-1) level was 1%.263-267engcinnamic acidpolarographic determinationdifferential-pulse polarographyurineArtigo10.1039/an9962100263WOS:A1996TX37500028Acesso restrito00721730180057120000-0002-2296-1393