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首页> 外文期刊>Talanta: The International Journal of Pure and Applied Analytical Chemistry >Aflatoxins screening in non-dairy beverages by Mn-doped ZnS quantum dots - Molecularly imprinted polymer fluorescent probe
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Aflatoxins screening in non-dairy beverages by Mn-doped ZnS quantum dots - Molecularly imprinted polymer fluorescent probe

机译：通过MN掺杂ZnS量子点筛选非乳制品饮料的黄曲霉毒素 - 分子印迹聚合物荧光探针

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摘要

Synthesized molecularly imprinted polymer (MIP) materials have been anchored on the surface of PEG-Mn-doped ZnS quantum dots (QDs) to develop a fluorescence probe for aflatoxins (AFs) recognition/determination in non-dairy beverages. MIP synthesis used 5,7-dimethoxycoumarin (DMC) as a dummy template molecule, and methacrylic acid (MAA) as a functional monomer. Under optimized conditions (1.25 mL of 5 mg L-1 MIP-PEG-ZnS QDs solution, pH 5.0, and 12 min delay time before scanning), the prepared MIP-QDs composite was found to offer high affinity and selectivity for AFs (AFB1, AFB2, AFG1 and AFG2). A fast fluorimetric screening method (total AFs assessment) was therefore feasible. The limits of detection (LOD) and quantification (LOQ) were 0.016 and 0.053 mg L-1, respectively. Analytical recoveries (inter- and intra-day assays) were from 99 +/- 4% to 107 +/- 5%, with RSD (intra-day assay) lower than 13, and RSD (inter-day) lower than 7%. The optimized method was applied for total AFs assessment in several non-dairy beverage samples.
机译：合成的分子印迹聚合物（MIP）材料已经锚固在PEG-MN掺杂ZnS量子点（QDS）的表面上，以在非乳制品饮料中为黄曲霉毒素（AFS）识别/测定产生荧光探针。 MIP合成使用5,7-二甲氧基苏马林（DMC）作为伪模板分子，以及作为官能单体的甲基丙烯酸（MAA）。在扫描前的优化条件下（1.25ml 5mg L-1 MIP-PEG-ZnS，pH 5.0和12分钟延迟时间），发现制备的MIP-QDS复合材料为AFS提供高亲和力和选择性（AFB1 ，afb2，afg1和afg2）。因此，快速荧光筛选方法（全部AFS评估）是可行的。检测限（LOD）和定量（LOQ）分别为0.016和0.053mg L-1。分析回收率（跨越和体内测定）为99 +/- 4％至107 +/- 5％，RSD（日期测定）低于13，RSD（日内）低于7％ 。在几种非乳制品饮料样品中施加了优化的方法。

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