Rapid detection of Rosa laevigata polysaccharide content by near-infrared spectroscopy |
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Authors: | Yan Hui Han Bang-xing Wu Qiong-ying Jiang Ming-zhu Gui Zhong-zheng |
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Institution: | a School of Biological and Environmental Engineering, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu 212018, China;b State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi 214122, China |
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Abstract: | We have investigated surface-enhanced Raman spectroscopy (SERS) spectrum of Omethoate (O,O-dimethyl-S-methylcarbamoylmethylthiophosphate). It is found significant signals in the ordinary Raman spectrum for solid-state Omethoate as well as strong vibrational signals absorbed on the silver sol surface which is prepared by γ-irradiation technique at a very low concentration. Effects of pH and anions (Cl-, Br-, I-) on the adsorption orientation are investigated as well. Two different adsorption mechanisms are deduced, depending on the experimental conditions. The sulfur atom or the sulfur and two oxygen atoms are adsorbed onto the silver sol surface. Among halide ions, Br- and I- are more strongly adsorbed onto the silver sol surface. As a result, the adsorption of Omethoate is less effective due to their steric hindrance. |
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Keywords: | Rosa laevigata Polysaccharide Near-infrared spectroscopy Rapid detection Wavelength selection |
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