Polarographic Determination of Glycyrrhizic Acid Based on Double Enhancement Action of Surfactant and Dissolved Oxygen
Polarographic Determination of Glycyrrhizic Acid Based on Double Enhancement Action of Surfactant and Dissolved Oxygen
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DOI：
10.1080/00032719908542974
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发表时间：
1999
影响因子：
2
通讯作者：
G. Wei;Kang Xiao-feng;Song Jun-feng
中科院分区：
文献类型：
--
作者：
G. Wei;Kang Xiao-feng;Song Jun-feng
本文研究了阳离子表面活性剂十六烷基三甲基溴化铵（CTMAB）和溶解氧（包括氧衍生物）对甘草酸（GA）极谱电流的双重增敏作用。GA的双增强电流包括两个附加电流。一种是CTMAB引起的吸附GA还原电流的增加。另一种是由溶解氧分子及其衍生物引起的GA催化电流。在0.1 M NaAc-Hac（pH4.7±0.1）× 10 −5 M CTMAB支持电解质中，GA的增强电流与其浓度在4 × 10 −7 M × 4.0 × 10 −6 M范围内呈线性关系。检测限为1.8x10−7 M。在相同的醋酸盐缓冲溶液中，GA的双增敏电流比其还原波高15倍左右。
ABSTRACT A method for the determination of glycyrrhizic acid (GA) is described based on polarographic current of GA enhanced doubly by both cation surfactant (cetyl trimethyl ammonium bromide (CTMAB)), and dissolved oxygen (including oxygen-derived species). The doubly enhanced current of GA includes two additional currents. One is the increased reduction current of adsorbed GA induced by CTMAB. The other is the catalytic current of GA caused by the dissolved oxygen molecule and its derived species. In 0.1 M NaAc-Hac (pH4.7±0.1) ∼ 1x10−5 M CTMAB supporting electrolyte without deoxygenation, the enhanced current of GA is linearly proportional to its concentration in the range of 4x10−7 M ∼ 4.0x10−6 M. The detection limit is 1.8x10−7 M. The double enhanced current of GA in sensitivity is about 15 times higher than its reduction wave in the same acetate buffer solution.