Special Centre for Nanoscience, Jawaharlal Nehru University, New Delhi 110067, India.
Special Centre for Nanoscience, Jawaharlal Nehru University, New Delhi 110067, India.
Food Chem. 2021 Mar 15;340:127835. doi: 10.1016/j.foodchem.2020.127835. Epub 2020 Aug 19.
A simple, sensitive and rapid fluorometric system has been developed for the detection of aldicarb (ALD) based on inner filter effect (IFE) of gold nanoparticles (AuNPs) on fluorescence (FL) intensity of carbon quantum dots (CQDs). Addition of CQDs into AuNPs, gets them aggregated due to electrostatic interaction resulting in quenching the FL intensity of CQDs. With addition of ALD into AuNPs, an intercalated layer was formed between them through Au-N and Au-S bond which reduced IFE of AuNPs. Hence, CQDs FL intensity recovered along with ALD concentration varying between 3.8 and 76 µg L with lower detection limit of 3.02 µg L. The spiked real samples study in fruits, vegetables and soft drinks revealed that this sensing platform was repeatable and effective for real samples. The validation of proposed method indicates that the ALD sensor is promising and adaptable for everyday on spot environment and food safety monitoring.
一种简单、灵敏、快速的荧光体系已被开发出来，用于基于金纳米粒子（AuNPs）对内滤效应（IFE）对碳量子点（CQDs）荧光（FL）强度的检测，以检测涕灭威（ALD）。向 AuNPs 中加入 CQDs ，由于静电相互作用使它们聚集，导致 CQDs 的 FL 强度猝灭。随着 ALD 加入到 AuNPs 中，通过 Au-N 和 Au-S 键在它们之间形成一个夹层，从而降低了 AuNPs 的 IFE。因此，随着 ALD 浓度在 3.8 到 76 µg/L 之间变化，CQDs 的 FL 强度恢复，检测限低至 3.02 µg/L。在水果、蔬菜和软饮料中的实际样品加标研究表明，该传感平台对于实际样品具有可重复性和有效性。该方法的验证表明，ALD 传感器具有在日常现场环境和食品安全监测中的应用潜力。
