Zuo Ying, Zhao Hua Wen, Huang Cheng Zhi, Zhang Qing
College of Chemistry and Chemical Engineering, MOE Key Laboratory for Luminescence and Real-Time Analysis, Southwest University, Chongqing 400718, PR China.
J Nanosci Nanotechnol. 2011 Jun;11(6):5007-11. doi: 10.1166/jnn.2011.4123.
In this contribution, we present a simple and sensitive method for detecting Cu2+ based on the Cu(2+)-induced aggregation of silver nanoparticle (AgNPs) capped with chitosan. Chitosan could be adsorbed on the surface of AgNPs, and keep AgNPs against aggregation. However, in the presence of Cu2+, AgNPs aggregate again, the absorption decreases, and the color changes from yellow to colorless, which is due to the coordination of Cu2+ and chitosan. The depressed intensity (deltaA) is in proportion to the concentration of Cu2+ over the range of 3.33-40.0 microM with the limit of detection (3sigma) of 10.25 nM, the recovery of 92.60-104.20% and R.S.D. of 0.94-4.62%. The advantages of this method are simple, sensitive and low cost.
在本论文中，我们提出了一种基于壳聚糖包覆的银纳米颗粒（AgNPs）在Cu(2+)诱导下发生聚集来检测Cu2+的简单且灵敏的方法。壳聚糖能够吸附在AgNPs表面，防止AgNPs聚集。然而，在Cu2+存在的情况下，AgNPs再次聚集，吸光度降低，颜色从黄色变为无色，这是由于Cu2+与壳聚糖发生了配位作用。在3.33 - 40.0 microM范围内，吸光度降低值（deltaA）与Cu2+浓度成正比，检测限（3sigma）为10.25 nM，回收率为92.60 - 104.20%，相对标准偏差为0.94 - 4.62%。该方法具有简单、灵敏且成本低的优点。
