Determination of Melamine in Dairy Products and Melamine Tableware by Inhibition Electrochemiluminescent Method

An electrochemiluminescent （ECL） method has been developed for the determination of melamine based on the inhibition of luminol ECL. A significant luminol ECL can be found at 1.47 V in the phosphate buffer solution at high pHs and low potential scan rates, this ECL signal can be inhibited obviously...

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Bibliographic Details
Published in:Chinese journal of chemistry 2011-08, Vol.29 (8), p.1601-1605
Main Author: 井伟 吕水源 李小晶 江晓芬 陈旻实 梁鸣 唐熙 许才明 陈锦权
Format: Article
Language:English
Subjects:
analytical method
ECL
electrochemiluminescent
inhibitor
luminol
melamine
三聚氰胺
乳制品
测定
电化学发光法
磷酸盐缓冲溶液
餐具
鲁米诺
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Summary:An electrochemiluminescent （ECL） method has been developed for the determination of melamine based on the inhibition of luminol ECL. A significant luminol ECL can be found at 1.47 V in the phosphate buffer solution at high pHs and low potential scan rates, this ECL signal can be inhibited obviously by melamine. The decrease of ECL intensity was linearly proportional to the logarithm of melamine concentration in the range of 1--100 ng/mL （R2~0.9911） and with the detection limit of 0.1 ng/mL. The method has been applied successfully to determine melamine in dairy products and melamine tableware, the recoveries were in the range of 98.5%--103.7% and 95.5%--106.0%, respectively. The mechanism of the inhibition effect was also proposed, the active oxygen （O2- ） generated from the electrooxidation of OH- reacted with luminol anion （L~-） to generate light emission, and the present of melamine can eliminate the active oxygen, which cause the decrease of the ECL intensity.
ISSN:1001-604X
1614-7065
DOI:10.1002/cjoc.201180287