基于灵敏光学纳米传感器检测含假冒藏红花产品中的柠檬黄。
Detection of tartrazine in fake saffron containing products by a sensitive optical nanosensor.
机构信息
Analytical Chemistry Department, Center of Excellence in Electrochemistry, School of Chemistry, College of Science, University of Tehran, Tehran, Iran.
Analytical Chemistry Department, Center of Excellence in Electrochemistry, School of Chemistry, College of Science, University of Tehran, Tehran, Iran.
出版信息
Food Chem. 2021 Jul 15;350:129197. doi: 10.1016/j.foodchem.2021.129197. Epub 2021 Feb 5.
A fluorescent assay for the selective analysis of tartrazine was developed. Tartrazine is a health-threatening food additive commonly used as fake saffron. An optical nanosensor was fabricated based on molecular imprinting technique in which carbon dots (CDs) as fluorophores and tartrazine as a template molecule were embedded in molecularly imprinted polymer (MIP) matrix. The synthesized CDs embedded in MIP (CDs-MIP) was characterized by various methods. The fluorescence intensity of (CDs-MIP) was selectively quenched in the presence of tartrazine in comparison with other similar food color additives. The correlation between the quenching of CD-MIP and the concentration of tartrazine was used as an optical sensing for rapid detection of tartrazine in the range of 3.3-20.0 nM (1.8-10.7 μg L) with detection limit of 1.3 nM (0.70 μg L). Eventually, the designed nanosensor was successfully applied for tartrazine detection in foodstuffs such as fake saffron, saffron tea and saffron ice cream samples.
开发了一种用于选择性分析柠檬黄的荧光分析方法。柠檬黄是一种对健康有威胁的食品添加剂，常被用作假冒藏红花。基于分子印迹技术，制备了一种光学纳米传感器，其中碳点 (CDs) 作为荧光团，柠檬黄作为模板分子被嵌入分子印迹聚合物 (MIP) 基质中。合成的嵌入 MIP 的 CDs (CDs-MIP) 通过各种方法进行了表征。与其他类似的食品着色剂相比，在存在柠檬黄的情况下，(CDs-MIP) 的荧光强度被选择性猝灭。CD-MIP 的猝灭与柠檬黄浓度之间的相关性被用作光学传感，用于快速检测柠檬黄，检测范围为 3.3-20.0 nM（1.8-10.7 μg L），检测限为 1.3 nM（0.70 μg L）。最终，该设计的纳米传感器成功应用于假冒藏红花、藏红花茶和藏红花冰淇淋等食品中柠檬黄的检测。
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