Key Laboratory of Optoelectronic Chemical Materials and Devices, Jianghan University, Wuhan, China.
College of Science, Huazhong Agricultural University, Wuhan, China.
J Fluoresc. 2017 Nov;27(6):2195-2200. doi: 10.1007/s10895-017-2160-9. Epub 2017 Sep 11.
The wide use of pesticide p-fluorophenoxyacetic acid has caused the serious environmental contaminant. A novel fluorescent probe for sensitive detection of p-fluorophenoxyacetic acid in aqueous solutions based on 3.0G quaternary ammonium polyamidoamine (PAMAM) dendrimer modified quantum dots (QDs) (PAMAM@QDs) was reported. Through the solvent-evaporation method, quaternary ammonium PAMAM was employed to modify the QDs. Poloxamer 188 was used to improve the solubility and stability. The resultant PAMAM@QDs dispersed well in water. Fluorescence (FL) spectroscopic study showed that the FL intensity of the PAMAM@QDs was enhanced in the presence of p-fluorophenoxyacetic acid. Under optimal conditions, the enhanced FL intensity as a function of concentration matched very well in the range of 1 ~ 200 µg/mL of p-fluorophenoxyacetic acid, while the lower limits of detection were found to be 0.16 µg/mL. These results show that PAMAM@QDs is a promising luminescent probe for the detection of pesticides.
农药对氟苯氧乙酸的广泛使用造成了严重的环境污染。本研究报道了一种基于 3.0G 代四价铵聚酰胺-胺（PAMAM）树枝状大分子修饰的量子点（QDs）（PAMAM@QDs）的新型荧光探针，用于在水溶液中灵敏检测对氟苯氧乙酸。通过溶剂挥发法，采用四价铵 PAMAM 对 QDs 进行修饰。聚氧乙烯-聚氧丙烯共聚物 188 被用来提高其溶解度和稳定性。所得的 PAMAM@QDs 在水中分散良好。荧光（FL）光谱研究表明，在存在对氟苯氧乙酸的情况下，PAMAM@QDs 的 FL 强度增强。在最佳条件下，增强的 FL 强度与浓度呈函数关系，在 1 ～ 200 μg/mL 的对氟苯氧乙酸范围内匹配得非常好，而检测下限被发现为 0.16 μg/mL。这些结果表明，PAMAM@QDs 是一种很有前途的用于检测农药的发光探针。
