Sensitive determination of Sudan dyes in foodstuffs by Mn-ZnS quantum dots
详细信息 查看全文
- 作者：Min Zhou ; Xiaofeng Chen ; Yinyin Xu ; Jichun Qu ; Lixin Jiao ; Huige Zhang ; Hongli Chen ; Xingguo Chen
- 关键词：Mn&ndash ; ZnS quantum dots ; Sudan dyes ; Fluorescence ; Quenching ; Sensitive detection ; Foodstuffs
- 刊名：Dyes and Pigments
- 出版年：2013
- 出版时间：October, 2013
- 年：2013
- 卷：99
- 期：1
- 页码：120-126
- 全文大小：1642 K
文摘
A novel luminescence sensing system has been designed for Sudan dyes detection based on the quenched fluorescence (FL) of oleic acid-functionalized Mn-ZnS quantum dots (QDs). The Sudan dyes could quench the fluorescence signal of Mn-ZnS QDs due to the so-called inner filter effect. Herein, it was demonstrated that this facile methodology could offer a rapid, reliable and selective detection of Sudan dyes, and the detection limits of Sudan I, II, III, and IV were 24.6, 32.7, 2.1, and 3.2?ng/mL, respectively. In this work, Sudan dyes were mainly detected in hot chili sauce, sausage, egg and tomato sauce, and Sudan I was chosen as spiked substance owning to its wide use as a coloring matter among Sudan dyes in many industrial and daily products. Furthermore, the recoveries of Sudan I from the standard fortified blank samples were in a range of 93.0-107.0 % , and the relative standard deviations (RSDs) were lower than 2.8 % (n?=?3).