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Successive detection of benzoic acid and total parabens in foodstuffs using mercaptosuccinic acid capped cadmium telluride quantum dots
Food Control ( IF 6 ) Pub Date : 2019-02-01 , DOI: 10.1016/j.foodcont.2018.10.009
Kanlaya Prapainop , Wid Mekseriwattana , Weena Siangproh , Orawon Chailapakul , Kriangsak Songsrirote

Abstract An approach for the determination of benzoic acid (BA) and total paraben content using mercaptosuccinic acid capped CdTe quantum dots (MSA-CdTe QDs) as an optical probe is presented. The levels of these preservatives in the samples of liquid foodstuff could be determined by both visible and fluorescent detection methods. For the analysis of paraben content, sample hydrolysis under alkaline conditions was required in order to obtain p-hydroxybenzoic acid (PHBA) prior to the addition of MSA-CdTe QDs. Both BA and PHBA could be quantified by their quenching of QD fluorescence, owing to the formation of hydrogen bonds between the carboxylic acid groups of the MSA-CdTe QDs and the analytes. Reverse-phase C18 solid phase extraction cartridge was exploited to reduce sample loss and organic solvent consumption in the sample preparation steps. The developed approach was successfully applied for the determination of the BA and total paraben content found in orange juice, soft drink, energy drink, beer, coconut milk, and fish sauce, giving a limit of detection of 0.3 mg/L for BA analysis, and 0.1 mg/L for PHBA (hydrolyzed form of parabens) analysis, with a linearity range from 1.0 mg/L to 500.0 mg/L. Since the concentrations of most preservatives added to products are controlled and regulated by raw, therefore, quality control is necessary to monitor the levels of these agents in products to better ensure the safety of customers.

中文翻译:

使用巯基琥珀酸封端的碲化镉量子点连续检测食品中的苯甲酸和总对羟基苯甲酸酯

摘要 提出了一种使用巯基琥珀酸封端的 CdTe 量子点 (MSA-CdTe QD) 作为光学探针测定苯甲酸 (BA) 和对羟基苯甲酸酯总含量的方法。液态食品样品中这些防腐剂的含量可以通过可见光和荧光检测方法来确定。对于对羟基苯甲酸酯含量的分析,需要在碱性条件下水解样品,以便在添加 MSA-CdTe QD 之前获得对羟基苯甲酸 (PHBA)。由于 MSA-CdTe QD 的羧酸基团与分析物之间形成氢键,BA 和 PHBA 都可以通过 QD 荧光的猝灭来量化。反相 C18 固相萃取柱用于减少样品制备步骤中的样品损失和有机溶剂消耗。所开发的方法已成功应用于橙汁、软饮料、能量饮料、啤酒、椰奶和鱼露中 BA 和对羟基苯甲酸酯总含量的测定,BA 分析的检出限为 0.3 mg/L, PHBA(对羟基苯甲酸酯的水解形式)分析为 0.1 mg/L,线性范围为 1.0 mg/L 至 500.0 mg/L。由于大部分添加到产品中的防腐剂的浓度是由原料控制和调节的,因此需要通过质量控制来监控产品中这些防腐剂的含量,以更好地确保客户的安全。PHBA(对羟基苯甲酸酯的水解形式)分析为 1 mg/L,线性范围为 1.0 mg/L 至 500.0 mg/L。由于大部分添加到产品中的防腐剂的浓度是由原料控制和调节的,因此需要通过质量控制来监控产品中这些防腐剂的含量,以更好地确保客户的安全。PHBA(对羟基苯甲酸酯的水解形式)分析为 1 mg/L,线性范围为 1.0 mg/L 至 500.0 mg/L。由于大部分添加到产品中的防腐剂的浓度是由原料控制和调节的,因此需要通过质量控制来监控产品中这些防腐剂的含量,以更好地确保客户的安全。
更新日期:2019-02-01
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