A Sensitive SERS Quantitative Analysis Method for Amino Acids Using Ruhemann’s Purple as Molecular Probe in Triangle Nanosilver Sol Substrate

A Sensitive SERS Quantitative Analysis Method for Amino Acids Using Ruhemann’s Purple as Molecular Probe in Triangle Nanosilver Sol Substrate
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以鲁赫曼紫为分子探针的三角纳米银溶胶基质中灵敏的SERS定量分析方法

DOI:
10.1007/s11468-016-0264-8
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发表时间:
2017-04
期刊:
影响因子:
3
通讯作者:
Zhiliang Jiang
Zhiliang Jiang
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Yanghe Luo;Guiqing Wen;Lu Ma;Aihui Liang;Zhiliang Jiang

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在H2 O2和柠檬酸钠存在下,用硼氢化钠还原银离子,制备了稳定的银纳米三角(AgNT)溶胶。在NaCl的作用下,AgNTs聚集到具有高表面增强拉曼散射(Sers)活性的基底上。在pH 6.0的Na 2 HPO 4-NaH 2 PO 4缓冲溶液(PBS)中,在80 °C水浴中,茚三酮与氨基酸反应形成蓝紫色络合物鲁曼紫(RP),RP分子吸附在聚集的AgNT表面上,在657 cm−1处显示出强的Sers峰。氨基酸浓度在0.7-99.8 μmol/L范围内与峰面积呈良好的线性关系,检出限为0.5 μmol/L。将Sers方法应用于样品中氨基酸的测定,结果令人满意。此外,还通过共振瑞利散射(RRS),吸收,和电子显微镜技术的分析系统进行了研究。
The stable silver nanotriangle (AgNT) sol was prepared by reduction of silver ions with sodium borohydride in the presence of H2O2 and sodium citrate. Under the action of NaCl, AgNTs were aggregated to a highly surface-enhanced Raman scattering (SERS) active substrate. In pH 6.0 Na2HPO4-NaH2PO4 buffer solution (PBS) at 80 °C water bath, ninhydrin reacted with amino acids to form blue-violet complex Ruhemann’s purple (RP), and the RP molecules adsorbed on the aggregated AgNT surfaces that exhibited a strong SERS peak at 657 cm−1. The peak was linear to amino acid concentration in the range of 0.7–99.8 μmol/L, with a detection limit (DL) of 0.5 μmol/L. This SERS method was applied to detect amino acid in samples, with satisfactory results. In addition, the analytical system was also investigated by resonance Rayleigh scattering (RRS), absorption, and electron microscope techniques.
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