Abstract
Chinese liquor Moutai is the “National alcoholic drink” in China and plays a very important role of social activities in Chinese people’s life. In pursuit of high profits, some illegal counterfeit Moutai liquors have begun to appear in the market. Therefore, it is an urgent need for new techniques to discriminate the genuine and counterfeit Moutai liquor. In this work, the conventional Ultraviolet-Visible (UV-Vis) spectroscopy and two-dimensional correlation UV-Vis spectroscopy are applied to obtain the UV-Vis characteristic of Moutai liquor and counterfeit one, respectively. The experimental results reveal that the conventional UV-Vis spectra of the genuine and counterfeit Moutai liquor are similar. However, the two-dimensional correlation UV-Vis spectra of them are different and this method would be applied to differentiate the counterfeit Moutai liquor from the genuine Moutai liquor. Compared with conventional methods, this novel method has the advantages of easy operation, simple instrumentation and direct recognition, which make it a potential tool in the fields of food safety.
Highlights
Chinese liquor is one of the oldest distilled spirits in the world and plays a significant role in Chinese people’sHow to cite this paper: Zhang, Z.Y., Jiang, J.Y., Wang, G.X., Wang, H., Liu, J. and Wang, H.Y. (2015) Application of Two-Dimensional Correlation UV-Vis Spectroscopy in Chinese Liquor Moutai Discrimination
UV-Vis Spectroscopy 2 mL liquor sample was added into a glass of bottle, 400 μL sodium hydroxide solution (1.75 mol/L) was added to the liquor, and the mixture solution was left to react in an oven at 70 ̊C, the UV-Vis spectrum of the reaction solution was collected once by a UV-Vis spectrometer every 30 min for 4 h or 5 min for 1 h
Further studies reveal that the complexity of Chinese liquor Moutai in the chemical classes is mainly including alcohols, esters, acids, aldehydes, ketones, phenols and nitrogen-heterocyclic and so on [29] [30]
Summary
Chinese liquor is one of the oldest distilled spirits in the world and plays a significant role in Chinese people’sHow to cite this paper: Zhang, Z.Y., Jiang, J.Y., Wang, G.X., Wang, H., Liu, J. and Wang, H.Y. (2015) Application of Two-Dimensional Correlation UV-Vis Spectroscopy in Chinese Liquor Moutai Discrimination. The Chinese liquor Moutai (or Maotai) is the most well-known Chinese liquor, owing to its long history of distillation, excellent and unique qualities and complex production processes [2]. Based on the unique geographical environment of Moutai town in China, the Moutai liquor owns the unusual fragrance [6], and it has ever won the gold medal at Panama Pan-world Fair in 1915 [7]. The most common detection strategy for analysis of Chinese liquors is integrity by component approach, such as gas chromatography, mass spectrometry and gas chromatograph-mass spectrometry [11]-[14] These techniques enable identification and quantification of hundreds of compounds of Chinese liquors, but the experimental processes are time-consuming and the instruments are expensive and large-scale, which limit their practical applications [15]-[17]. Counterfeit liquors, which may be produced by mixing industrial alcohol with water, are not suitable for tasting and discriminating by oenophiles [19]
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