College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China.
College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China.
Talanta. 2018 Aug 1;185:309-315. doi: 10.1016/j.talanta.2018.03.066. Epub 2018 Mar 23.
In this work, Lycii Fructus as raw materials for green synthesis of fluorescent carbon dots (CDs) reduce AgNO. The CDs-AgNPs were synthesized by one-step method. CDs were applied to stabilize AgNPs due to abundant functional groups on the surface of CDs. In presence of phoxim, the dispersed CDs-AgNPs get aggregated and the absorption peak with red shift from 400 nm to 525 nm, resulting in the color changed from yellow to red. Under optimized conditions, the absorbance ratio at A/A was related linearly to the concentrations of phoxim in the range of 0.1-100 μM. The detection limit was calculated to 0.04 μM, which is lower than maximum residue limits of phoxim in samples in China. The colorimetric sensor was successfully utilized to monitoring phoxim in environmental and fruit samples with good recoveries ranges from 87% to 110.0%. These results showed the sensor had a promising application prospect in real samples.
本工作以枸杞为原料，通过绿色合成法还原 AgNO ，得到了荧光碳点（CDs）。采用一步法合成了 CDs-AgNPs，由于 CDs 表面含有丰富的官能团，因此可以用来稳定 AgNPs。在毒死蜱存在的情况下，分散的 CDs-AgNPs 发生聚集，吸收峰从 400nm 红移至 525nm，导致颜色从黄色变为红色。在优化条件下，A/A 的吸光度比值与 0.1-100μM 范围内的毒死蜱浓度呈线性关系。检测限计算为 0.04μM，低于中国样品中毒死蜱的最大残留限量。该比色传感器成功用于环境和水果样品中毒死蜱的监测，回收率范围为 87%至 110.0%。这些结果表明，该传感器在实际样品中具有广阔的应用前景。
