Direct detection of Pb2+ and Cd2+ in juice and beverage samples using PDMS modified nanochannels electrochemical sensors
Direct detection of Pb2+ and Cd2+ in juice and beverage samples using PDMS modified nanochannels electrochemical sensors
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DOI：
10.1016/j.foodchem.2021.129632
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发表时间：
2021-04-05
期刊：
影响因子：
8.8
通讯作者：
Lin, Xingyu
中科院分区：
文献类型：
--
作者：
Li, Gangfeng;Belwal, Tarun;Lin, Xingyu
由于大量干扰成分的污染和干扰，直接电化学检测在实际食品样品中仍然具有挑战性。在此，我们报道了一种基于二氧化硅纳米通道和聚二甲基硅氧烷的二元组装的电化学传感平台，该平台能够在不进行复杂的前处理的情况下检测真实食品样品中的Pb2+和Cd2+。利用微分脉冲阳极溶出伏安法，电化学检测包括金属物种在修饰后的二氧化硅纳米通道中的电沉积和随后的阳极溶出。在优化的条件下，铅的线性范围为4~1500mgPb2+，镉的线性范围为30~900mgL-1。300mgL-1中铅、镉的相对标准偏差分别为2.9%和3.6%。在没有繁琐的前处理的情况下，成功地对实际果汁和饮料样品中的Pb2+和Cd2+进行了定量检测，表明所研制的传感器对未加工食品具有良好的抗干扰性和实用性。
Direct electrochemical detection in real food samples remains challenging due to the fouling and interference by abundant interference components. Herein, we report an electrochemical sensing platform based on binary assembly of silica nanochannels and polydimethylsiloxane that is able to detect Pb2+ and Cd2+ in real food samples without complex pretreatments. Using differential pulse anodic stripping voltammetry, the electrochemical detection consists of electro-deposition of metal species and subsequent anodic stripping in the modified silica-nanochannels. Under the optimized conditions, the linear ranges were obtained from 4 to 1500 mu g L-1 for Pb2+ and 30 to 900 mu g L-1 for Cd2+. The relative standard deviations were 2.9% and 3.6% for Pb2+ and Cd2+ of 300 mu g L-1. Without tedious pretreatments, the quantitative detection of Pb2+ and Cd2+ in real juice and beverage samples was successfully performed, revealing that the developed sensor possesses excellent anti-interference and practicability properties for unprocessed food.