光谱学与光谱分析, 2020, 40 (7): 2143, 网络出版: 2020-12-04   

基于绝对拉曼差谱技术的白酒乙醇浓度测量

Ethanol Concentration in Chinese Liquors by Absolute Raman Difference Spectra
作者单位
1 西安电子科技大学物理与光学工程学院, 陕西 西安 710071
2 西安电子科技大学智能传感交叉研究中心, 陕西 西安 710071
摘要
随着拉曼光谱技术的快速发展, 尤其是便携式拉曼光谱仪的普及, 拉曼光谱在食品安全快速分析领域显得极为重要。 目前拉曼光谱用于白酒质量的定量分析还较少。 因为在不同乙醇浓度下, 乙醇水溶液微观结构不同, 所以其拉曼光谱会有区别。 提出一种绝对拉曼差谱分析新方法来定量分析这些光谱区别, 并用于定量获取乙醇的浓度。 把拉曼光谱进行强度归一化, 然后把待测样品的光谱减去纯乙醇的光谱, 再取绝对值就获得了绝对拉曼差谱。 绝对拉曼差谱的强度和浓度有很好的相关性。 利用这种关联测量了一系列瓶装白酒的乙醇含量。 测量值与白酒标识的度数吻合得非常好, 这也证明了绝对拉曼差谱的可靠性。 基于该方法, 系统地测量了西安市一系列散酒的拉曼光谱。 绝对拉曼差谱分析显示散酒的乙醇浓度普遍比其标识值偏低几度, 这也凸显了散装白酒需要加强监管。 实验证明利用绝对拉曼差谱技术可为白酒乙醇浓度测量提供一种快速检测方法。
Abstract
Because of the rapid development of Raman spectroscopy, especially the popularization of portable Raman spectrometer, Raman spectroscopy is particularly important in the rapid analysis of food safety. However, Raman spectroscopy is still less used to analyze the quality of liquor. Because the microstructures of aqueous ethanol solution are different at different concentrations, the Raman spectra are different at different concentrations. Here we proposed an absolute Raman difference spectra to quantify these spectral differences and the concentration of aqueous ethanol. The absolute Raman difference spectra are obtained through subtracting the normalized spectra of pure ethanol from the normalized spectra of solution. The intensity of the absolute Raman difference spectra related to the concentration of ethanol. Using the relationship, we measured the ethanol concentration of a series of bottled Chinese liquors. The measured values agree well with those marked on the bottle, which confirms the reliability of the absolute Raman difference spectra. Based on this method, we also measured the spectra of a series of bulk liquors in Xi’an. The results show that the ethanol concentration of bulk liquor is generally a few degrees lower than its identification value, which highlights the need for supervision of bulk liquors. Our results show significantly that the absolute Raman difference spectrum is a good method to detect the ethanol concentration of liquors rapidly.

于岚, 孟森森, 林珂, 段司琪, 王志强, 张睿挺. 基于绝对拉曼差谱技术的白酒乙醇浓度测量[J]. 光谱学与光谱分析, 2020, 40(7): 2143. YU Lan, MENG Sen-sen, LIN Ke, DUAN Si-qi, WANG Zhi-qiang, ZHANG Rui-ting. Ethanol Concentration in Chinese Liquors by Absolute Raman Difference Spectra[J]. Spectroscopy and Spectral Analysis, 2020, 40(7): 2143.

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