近红外光谱法快速测定饮料酒中酒精度

Rapid Test of Alcoholicity in Alcoholic Beverages by Near Infrared Spectroscopy

摘要:

研究了近红外光谱法快速测定饮料酒中酒精度的技术方法。基于专用型近红外光谱仪，以模式葡萄酒为研究对象，确定该方法的线性范围。用该方法与数字密度计法同时测定100份葡萄酒样品，进行方法比较。并进一步研究该方法对测定其他类型饮料酒酒精度的准确性，包括发酵酒（果酒、清酒和黄酒）以及蒸馏酒（伏特加，威士忌、白兰地、朗姆酒和白酒）。该方法实际数值显示范围为0~28% vol，在0~20% vol范围内结果较准确。与密度计法测定葡萄酒中酒精度比较，经t检验（t0.05,4=2.78）和F检验（F0.05(2, 2)=19.0），两种方法结果一致，没有显著性差异。与密度计法测定其他类型饮料酒中酒精度比较，符合性判别结果也均一致。研究表明，该方法操作简便、快速、重复性好、既可满足葡萄酒的日常酒精度检测需求外，还可应用于其他饮料酒样品。

Abstract:

The rapid determination of alcoholicity content in alcoholic beverages by near infrared spectroscopy (NIR) method was studied. The alcoholicity of 100 wine samples was detected by NIR and digital density meter method and the linear measuring range of NIR method was determined. Furthermore, the accuracy of the alcoholicity in other types of alcoholic beverages, such as fermented alcoholic beverages (fruit wine, sake and Chinese rice wine) and distilled spirits (vodka, whisky, brandy, rum and Chinese spirits ) were also investigated by using NIR . The results showed that the actual digital display measuring range was 0~28%vol，and the linear range was 0~20% vol. The alcoholicity in wine samples measured by two different methods showed a good correlation and there was no significant difference through t test (t0.05,4=2.78) and F test (F0.05(2,2)=19.0) at the level of α = 0.05. The alcoholicity in other types of alcoholic beverages determined by the two methods was consistent in evaluation of conformity. NIR method verified in this study is easy and fast to operate and has good repeatability. It is appropriate for determining alcoholicity in wine samples, and other kinds of alcoholic beverages.