Chip-based molecularly imprinted monolithic capillary array columns coated GO/SiO2 for selective extraction and sensitive determination of rhodamine B in chili powder

卷:214

Zhai, Haiyun ; Huang, Lu ; Chen, Zuanguang ; Su, Zihao ; Yuan, Kaisong ; Liang, Guohuan ; Pan, Yufang

Guangdong Pharmaceut Univ

关键词: Rhodamine B;    Molecularly imprinted solid-phase extraction;    Micro-fluidic chip;    Monolithic array column;    Chili powder;   

DOI  :  10.1016/j.foodchem.2016.07.124

学科分类：食品科学和技术

【 摘 要 】

A novel solid-phase extraction chip embedded with array columns of molecularly imprinted polymer coated silanized graphene oxide (GO/SiO2-MISPE) was established to detect trace rhodamine B (RB) in chili powder. GO/SiO2-MISPE monolithic columns for RB detection were prepared by optimizing the supporting substrate, template, and polymerizing monomer under mild water bath conditions. Adsorption capacity and specificity, which are critical properties for the application of the GO/SiO2-MISPE monolithic column, were investigated. GO/SiO2-MIP was examined by scanning electron microscopy (SEM) and Fourier transform-infrared spectroscopy. The recovery and the intraday and interday relative standard deviations for RB ranged from 83.7% to 88.4% and 2.5% to 4.0% and the enrichment factors were higher than 110-fold. The chip-based array columns effectively eliminated impurities in chili powder, indicating that the chip-based GO/SiO2-MISPE method was reliable for RB detection in food samples using high-performance liquid chromatography. Accordingly, this method has direct applications for monitoring potentially harmful dyes in processed food. (C) 2016 Elsevier Ltd. All rights reserved.