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
中科院分区:
文献类型:
--
作者:
Yanghe Luo;Guiqing Wen;Lu Ma;Aihui Liang;Zhiliang Jiang
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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