Quaternized chitosan/silver nanoparticles composite as a SERS substrate for detecting tricyclazole and Sudan I
Quaternized chitosan/silver nanoparticles composite as a SERS substrate for detecting tricyclazole and Sudan I
复制标题
季铵化壳聚糖/银纳米粒子复合物作为SERS底物用于检测三环唑和苏丹I
DOI：
10.1016/j.apsusc.2015.05.149
复制
发表时间：
2015-10-01
影响因子：
6.7
通讯作者：
Sun, Runcang
中科院分区：
文献类型：
--
作者：
Chen, Kaihang;Shen, Zuguang;Sun, Runcang
There is an urgent need to develop a highly sensitive detection system for detecting trace amounts of food contaminants. In this study, optimal synthesis of silver nanoparticles (Ag NPs) with stable and narrow size distribution in the range of 15-25 nm was performed under microwave irradiation, using quaternized chitosan (QCS) as reducing and stabilizing agent. The results showed that the ratio of QCS to [Ag(NH3)(2)](+), reaction temperature, irradiation time, the degree of substitution (DS) and molecular weight (Mw) of QCS had obvious effects on the formation, particle size and size distribution of Ag NPs. In addition, utilizing QCS/Ag NPs composite as SERS substrate, tricyclazole and Sudan I could be rapidly and sensitively detected with the limit of detection (LOD) as low as 50 ppb and 10 ppm, respectively. Compared with previously reported works, our detection system are of great stability and operability. The QCS was coated on the surface of Ag core, avoiding aggregation of Ag NPs and creating hot spots, in turn, providing superior amplification of SERS. Thus, it is believed that the QCS/Ag NPs composite could be considered as an ideal SERS-active substrate for detection of food contaminants. (C) 2015 Elsevier B.V. All rights reserved.
