Au@SiO2核壳结构-表面增强拉曼光谱原位检测食品中的酸性橙II

doi:10.6023/A12050196

化学学报 ›› 2012, Vol. 70 ›› Issue (16): 1686-1689.DOI: 10.6023/A12050196 上一篇下一篇

研究通讯

Au@SiO₂核壳结构-表面增强拉曼光谱原位检测食品中的酸性橙II

张宗绵^a, 刘睿^a, 徐敦明^b, 刘景富^a

a 中国科学院生态环境研究中心环境化学与生态毒理学国家重点实验室北京 100085;
b 中华人民共和国厦门出入境检验检疫局厦门 361026

投稿日期:2012-05-14 发布日期:2012-08-06
通讯作者: 刘景富 E-mail:jfliu@rcees.ac.cn
基金资助:
项目受国家杰出青年科学基金(No. 21025729)和国家质检总局科技项目(No. 2012IK193)资助.

In Situ Detection of Acid Orange II in Food Based on Shell-Isolated Au@SiO₂ Nanoparticle-Enhanced Raman Spectroscopy

Zhang Zongmian^a, Liu Rui^a, Xu Dunming^b, Liu Jingfu^a

a State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environment Sciences, Chinese Academy of Sciences, Beijing 100085;
b Xiamen Entry-Exit Inspection and Quarantine Bureau, Xiamen 361026

Received:2012-05-14 Published:2012-08-06
Supported by:
Project supported by the National Science Fund for Distinguished Young Scholars (No. 21025729) and the General Administration of Quality Supervision, Inspection and Quarantine of China (No. 2012IK193).

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1. Au@SiO₂核壳结构-表面增强拉曼光谱原位检测食品中的酸性橙II.PDF(443KB)

摘要/Abstract

以具有核壳结构的Au@SiO₂纳米颗粒为基底, 建立了一种以表面增强拉曼(SERS)原位、快速检测食品中非法添加剂酸性橙II的新方法. 研究了活性硅加入量对所形成的Au@SiO₂纳米颗粒的SERS活性的影响, 制备了具有最佳SERS活性的Au@SiO₂, 并以此为SERS基底建立了酸性橙II的分析方法, 可实现0.17 mg/L酸性橙II的SERS检测. 将合成的Au@SiO₂滴加到瓜子表面后, 可以实现对瓜子表面酸性橙II浓度为0.01 mg/g时的SERS检测, 能够满足食品中酸性橙II的测定要求, 有望用于瓜子及其它可能被非法添加该物质的食品的现场、快速检测.

关键词: 金胶体, 核壳结构, 表面增强拉曼光谱, 酸性橙II, 食品安全

As a strong carcinogen to humans, acid orange II is forbidden to be added as an additive into foodstuff. Because the foods colored with acid orange II showed stable and colorful appearance, acid orange II is broadly utilized by illegally producers for their low costing. Currently available analytical methods for acid orange II are mainly based on fluorescence and liquid chromatography, which are time-consuming and tedious as acid orange II has to be extracted from the samples before determination. For efficient detection and insurance of food safety, it is urgent to develop fast and low-cost in situ assay methods for field detection of acid orange II on foods. In this study, shell-isolated Au@SiO₂ nanoparticles is prepared for detecting acid orange II on food. Gold colloidal solution with good size distribution (50 nm) is prepared using the standard sodium citrate reduction method, followed by coating a thin layer of SiO₂ on Au nanoparticle surface. This shell-isolated Au@SiO₂ is obtained by the addition of active silica to the gold colloidal solution, with the (3-aminopropyl)trimethoxysilane (APTMS) as the coupling agent at pH 8.5. By regulating the amount of the active silica, the Au@SiO₂ with different silica shell thickness is synthesized. Ultraviolet-visible spectroscopy (UV-Vis) and transmission electron microscope (TEM) are employed to characterize the optical property and morphology of the as-synthesized Au@SiO₂ nanoparticles. The amount of the active silica added in preparation of the Au@SiO₂ is optimized through comparing the surface enhanced Raman scattering (SERS) intensity of acid orange II, using the synthetic Au@SiO₂ structure as the SERS substrate. Under the optimized experimental conditions, acid orange II on the Si wafer can be detected at concentrations below 0.17 mg/L. The feasibility of the proposed method for detecting acid orange II in real samples is verified by spreading the Au@SiO₂ nanoparticles on the surface of the watermelon seeds stained with acid orange II. Results showed that this novel method is capable of detecting 0.01 mg/g acid orange II stained on the watermelon seeds. This proposed method was applied to assay sunflower seeds and watermelon seeds purchased from local stores. It is expected that this proposed method is applicable for in situ detection of acid orange II on the surface of other food samples.

Key words: gold sol, shell-isolated, surface enhanced Raman scattering, acid orange II, food safety

引用此文

张宗绵, 刘睿, 徐敦明, 刘景富. Au@SiO₂核壳结构-表面增强拉曼光谱原位检测食品中的酸性橙II[J]. 化学学报, 2012, 70(16): 1686-1689.

Zhang Zongmian, Liu Rui, Xu Dunming, Liu Jingfu. In Situ Detection of Acid Orange II in Food Based on Shell-Isolated Au@SiO₂ Nanoparticle-Enhanced Raman Spectroscopy[J]. Acta Chimica Sinica, 2012, 70(16): 1686-1689.

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Au@SiO₂核壳结构-表面增强拉曼光谱原位检测食品中的酸性橙II

In Situ Detection of Acid Orange II in Food Based on Shell-Isolated Au@SiO₂ Nanoparticle-Enhanced Raman Spectroscopy

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