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鲜枣中糖精的快速、无标签检测
吴昊, 邵菲, 郭小玉, 吴一萍, 杨海峰
上海师范大学 化学与材料科学学院, 上海 200234
摘要:
糖精是食品工业中最古老的人造甜味剂之一,因为没有卡路里而被广泛使用,但其滥用是非法的,食品中最大允许添加量为8.189×10-4mol·L-1.介绍了以六磷酸肌醇(IP6)为保护剂合成的银(Ag)纳米粒子(Ag NPs),即Ag NPs@IP6,并提出了一种基于表面增强拉曼散射(SERS)的快速方法.探讨了食品中糖精的测定,用最佳SERS法测定水中糖精的最低可检测浓度可达50 nmol·L-1,符合食品添加剂耐受性水平的国家食品安全标准.提出了基于便携式拉曼的AgNPs@IP6的SERS方法,可用于现场检测食品中的糖精,如新鲜枣果.
关键词:  糖精  银(Ag)纳米粒子(Ag NPs)  表面增强拉曼散射光谱(SERS)  快速检测
DOI:10.3969/J.ISSN.1000-5137.2020.02.001
分类号:O614.24
基金项目:The National Natural Science Foundation of China(21475088)
Rapid and label-free detection of saccharin in fresh jujube fruit
WU Hao, SHAO Fei, GUO Xiaoyu, WU Yiping, YANG Haifeng
College of Chemistry and Materials Science, Shanghai Normal University, Shanghai 200234, China
Abstract:
Saccharin is one of the oldest artificial sweeteners used in food industries because it has no calories. However, the abuse of saccharin is illegal.According to the National Standard of China, the maximum permitted level is 8.189×10-4 mol·L-1 in food. In this work, inositol hexakisphosphate(IP6)as protection agent was introduced to synthesize silver(Ag)nanoparticles(Ag NPs), designated as Ag NPs@IP6, and a rapid method based on surfaceenhanced Raman scattering(SERS)was explored for the determination of saccharin in food products.The minimal detectable concentration for saccharin in water by using the optimal SERS assay was 50 nmol·L-1, which meets the requirement of National Food Safety Standard for tolerance level of food additives.This proposed Ag NPs@IP6- based SERS method with the portable Raman system could be implemented for on- site detection of saccharin in food such as fresh jujube fruit, a kind of Chinese date product.
Key words:  saccharin  silver (Ag)nanoparticles (Ag NPs)  surface-enhanced Raman scattering(SERS)  rapid detection