福瑞姆
化学
检出限
基质(水族馆)
再现性
表面增强拉曼光谱
拉曼光谱
胶体金
纤维素
分析化学(期刊)
细菌纤维素
色谱法
纳米技术
纳米颗粒
拉曼散射
光学
杀虫剂
有机化学
材料科学
海洋学
物理
农学
生物
地质学
作者
Xiao Li,Shaolong Feng,Marti Z. Hua,Xiaonan Lu
出处
期刊:Talanta
[Elsevier]
日期:2023-03-01
卷期号:254: 124128-124128
被引量:24
标识
DOI:10.1016/j.talanta.2022.124128
摘要
A flexible nanocomposite composed of bacterial cellulose (BC) and gold nanoparticles (AuNPs) was developed as a SERS substrate to determine thiram on apple surface by two collection methods namely "paste-and-peel" and "wiping". Enhancement factor of this SERS substrate for sensing thiram residues was determined to be 2.8 × 105. Compared to the benchtop Raman spectrometer, portable Raman spectroscopic device showed a lower sensitivity towards thiram residues with limit of detection at 0.98 ppm, satisfying maximum residue level of thiram on apple required by both Europe and America. A good linear correlation of SERS peak intensity at 1368 cm-1 and different concentrations of thiram (1-50 ppm) revealed a coefficient up to 0.99. This flexible BC-based SERS substrate has a great analytical performance in sensitivity, reproducibility and stability, and is suitable for rapid detection (<8 min) and quantitative analysis of pesticides on food surface.
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