中文摘要：通过多种市售巯基型封端剂合成红光水溶性半导体量子点，在PH值为7.4的情况下，相对于其他常见的杀虫剂/除草剂，包括敌草快，这种纳米表面带有负电荷的量子点对百草枯具有更好的特异性。覆膜石英板是一种低成本、可在天然水和人尿液中对百草枯进行现场检测的便携式传感器。在对市场上不同浓度的百草枯和百草枯污染的掺假乳制品进行检测时，该方法表现出了良好的灵敏度。最后，我们还对蔬菜、水果、谷物、饲料等50多种不同的食品进行了百草枯残留标记。
外文摘要：Red-light-emitting water-soluble semiconducting quantum dots (QDs) were synthesized by using a wide variety of commercially available thiol-type capping agents. QDs with a negatively charged nanosurface showed excellent selectivity for paraquat (PQ) at pH 7.4 over other commonly encountered pesticides/herbicides, including diquat (DQ). The presence of a 4,4'-bis-pyridinium unit in PQ enabled it to initiate long-range aggregation, thereby leading to the formation of nanostructures with excellent emission-quenching behavior. Precoated quartz plates were developed as a low-cost, portable sensor for the on-site detection of PQ in both natural water and human urine. Estimation of the PQ concentration was performed in different commercial formulations and the detection of PQ contamination in adulterated dairy product was also achieved with excellent sensitivity. Finally, we screened more than 50 different food items, including vegetables, fruits, cereals, and fodders, to construct a generalized marker for any residual PQ in such specimens.
外文关键词：nanoparticles, nitrogen heterocycles, paraquat, quantum dots, sensors
作者：Dey, Nilanjan; Bhagat, Deepa; Cherukaraveedu, Durgadas; Bhattacharya, Santanu
作者单位：Indian Inst Sci, Dept Organ Chem, Bangalore 560012 1, Karnataka, India.
期刊名称：CHEMISTRY-AN ASIAN JOURNAL
期刊影响因子：4.592
出版年份：2017
出版刊次：1
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