Awamori is a traditional distilled alcohol beverage unique to Okinawa, Japan. This study evaluated the potential of ultraviolet–visible (UV–VIS) spectroscopy in the assessment and differentiation of different Awamori samples. Thirty-one Awamori samples that could be classified differently based on attributes such as their distillation methods (atmospheric distillation and vacuum distillation), aging periods (0–18 years), batches (years 2017 and 2014), and distilleries of origin were investigated by UV–VIS spectroscopy and chromatographic analysis. Principal component analysis (PCA) of UV–VIS spectra showed that Awamori of atmospheric distillation and vacuum distillation could be clearly distinguished based on low and high PC1 scores, respectively; both young Awamori (aged less than 3 years) and Awamori from the 2017 batch exhibited low PC1 scores and high PC2 scores. Wavelength ranges with high loading values that correspond to the volatile compounds which have high correlations with PC scores, such as furfural, phenethyl alcohol, vanillin, and benzaldehyde, were observed in the UV–VIS spectral profiles. These volatile compounds with unique aroma characteristics can characterize Awamori attributes. Therefore, UV–VIS spectroscopy with the aid of chemometric analysis was demonstrated as a high potential technique for the rapid and low-cost evaluation and characterization of Awamori samples.

中文翻译：

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用UV-VIS光谱法评估日本泡盛烈酒

泡盛是日本冲绳特有的传统蒸馏酒精饮料。这项研究评估了紫外线-可见（UV-VIS）光谱在评估和区分不同泡盛样品中的潜力。对31个泡盛样品进行了分类，根据其蒸馏方法（常压蒸馏和真空蒸馏），陈化时间（0-18年），批次（2017年和2014年）和原产蒸馏酒等属性进行了分类紫外可见光谱和色谱分析。UV-VIS光谱的主成分分析（PCA）表明，泡盛分别基于低和高PC1分数可以清楚地区分常压蒸馏和真空蒸馏的方法；年轻的泡盛（年龄小于3岁）和2017年批次的泡盛均表现出低PC1分数和高PC2分数。在UV-VIS光谱图谱中观察到了高负载值的波长范围，该波长范围对应于与​​PC评分具有高度相关性的挥发性化合物，例如糠醛，苯乙醇，香兰素和苯甲醛。这些具有独特香气特征的挥发性化合物可以表征泡盛的特性。因此，在化学计量学分析的帮助下，UV-VIS光谱被证明是一种快速，低成本评估和表征甲酚的高潜力技术。泡盛样品。