Selective Solid-Phase Extraction of Sudan I in Chilli Sauce by Single-Hole Hollow Molecularly Imprinted Polymers

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• 作者：Zhong Zhang ; Shoufang Xu ; Jinhua Li ; Hua Xiong ; Hailong Peng ; Lingxin Chen
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2012
• 出版时间：January 11, 2012
• 年：2012
• 卷：60
• 期：1
• 页码：180-187
• 全文大小：390K
• 年卷期：v.60,no.1(January 11, 2012)
• ISSN：1520-5118

文摘

A new single-hole hollow molecularly imprinted polymer (SHH-MIP) was prepared by multistep seed swelling polymerization using Sudan I as template molecule and successfully applied to selective solid-phase extraction (SPE) of Sudan dyes in chilli sauce samples. The polymers possessed high specific surface area obtained by nitrogen adsorption and good thermal stability without decomposition lower than 380 掳C by thermogravimetry analysis. Much higher binding capacity was exhibited than with irregular solid MIP prepared by bulk polymerization, because most of the binding sites were located in the surface of the polymers, facilitating template removal and mass transfer. Accordingly, the SHH-MIP was employed as SPE adsorbent for chilli sauce analysis and offered high recoveries for Sudan I in the range of 87.5鈥?03.4% with the precision of 1.94鈥?.33% at three spiked levels. The SHH-MIP with high selectivity and high stability was demonstrated to be potentially applicable for high selective preconcentration and determination of trace Sudan dyes in complicated samples.

Keywords:

Sudan dyes; molecularly imprinted polymers; solid-phase extraction; emulsifier-free emulsion polymerization; chilli sauce