Detection of mixed organophosphorus pesticides in real samples using quantum dots/bi-enzyme assembly multilayers

Simple and rapid colorimetric detection of p-nitrophenyl substituent organophosphorous nerve agents

“…The LOD achieved here represents the lowest value reported so far for paraoxon detection using optical absorbance spectrometry or chemical colorimetry and is far below the oral lethal dose for humans provided by US Environmental Protection Agency and US Public Health Service for paraoxon and their derivatives [21][22][23][24]. Even though enzyme or electrochemical-based techniques may offer relatively lower LOD [25][26][27], the proposed method offers a better trade-off between simplicity, performance and cost-effectiveness. …”

Selective detection of parathion-methyl based on near-infrared CuInS2 quantum dots

“…So far, most previous reports on the PM detection were based on its corresponding antibody (Yan, Tang, et al, 2014), bi-enzymes of AChE and choline oxidase (Gao et al, 2012;Meng et al, 2013;Zheng et al, 2011), and under an electrochemical potential (Du et al, 2010;Liang, Song, & Gong, 2014). In this paper, the CuInS 2 QDs-Pb 2+ system that could be used to detect PM in aqueous solution without other costly antibodies and specific conditions.…”

“…These analytical procedures always require expensive instrumentation, complex sample preparation, purification procedures, or costly bio-molecular reagents. Therefore, some OPs sensors have been established based on the inhibition mechanism of AChE or other technologies, for example, bi-enzymes of AChE and choline oxidase (Gao, Tang, & Su, 2012;Meng, Wei, Ren, Ren, & Tang, 2013;Zheng, Li, Dai, Liu, & Tang, 2011). Du et al reported a sensor for electrochemical quantification of enzymatic inhibition for biomonitoring of OPs (Du et al, 2011).…”

Nanomaterials for Sensing and Destroying Pesticides

“…50 The authors discuss the possible surface etching of the QDs by H 2 O 2 , leading to production of more surface defects and a gradual decrease of QD sizes with the consequent decrease on the fluorescence.…”