A silver nanorod resonance rayleigh scattering-energy transfer analytical platform for trace tea polyphenols.
A silver nanorod resonance rayleigh scattering-energy transfer analytical platform for trace tea polyphenols.
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DOI：
10.1016/j.foodchem.2015.10.137
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发表时间：
2016-04
期刊：
影响因子：
8.8
通讯作者：
Aihui Liang;Yaohui Wang;G. Wen;Xinghui Zhang;Yanghe Luo;Zhiliang Jiang
中科院分区：
文献类型：
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作者：
Aihui Liang;Yaohui Wang;G. Wen;Xinghui Zhang;Yanghe Luo;Zhiliang Jiang
采用NaBH 4-H2 O2和柠檬酸盐热还原两步法制备了稳定的红色银纳米棒（AgNR）溶胶，其在346 nm处具有较强的共振瑞利散射（RRS）峰。在pH3.8的HAc-NaAc缓冲溶液中，茶多酚（TP）与铵态氮（AM）反应生成黄色有机物（OM）作为受体，与AgNR供体作用较近，由于AgNR RRS光谱与OM吸收光谱的重叠，发生了RRS能量转移（RRS-ET）。随着TP浓度的增加，RRS强度降低，这是由于RRS-ET增加。因此，构建了一个简单、灵敏的AgNR表面等离子体共振吸收光谱分析平台，可检测0.05-0.85 μg/mL的痕量TP，检测限为0.03 μg/mL。利用该RRS-ET分析平台对茶叶样品中的TP进行了分析，结果令人满意。
The stable silver nanorod (AgNR) sol in red was prepared by the two-step procedure of NaBH4–H2O2and citrate heating reduction, and it exhibited a strong resonance Rayleigh scattering (RRS) peak at 346 nm. In pH 3.8 HAc–NaAc buffer solution, tea polyphenols (TP) reacted with ammonium molybdate (AM) to form yellow organic molybdate (OM) as receptor that was closed to the donor of AgNR, the RRS energy transfer (RRS-ET) takes place, owing to the overlapping between the AgNR RRS spectra and OM absorption spectra. When TP concentration increased, the RRS intensity decreased due to the RRS-ET increasing. So, a simple and sensitive AgNR surface plasmon RRS-ET analytical platform was fabricated to detect trace TP in the range of 0.05–0.85 μg/mL, with a detection limit of 0.03 μg/mL TP. The TP in tea samples was analyzed by this RRS-ET analysis platform, with satisfactory results.