[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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[in Japanese]

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To classify the compounds of commercially available Awamori, we analyzed 78 volatile compounds by head space solid phase micro extraction (SPME), and 6 volatile compounds by direct head space analysis. There was a significant difference in 42 volatile compounds between aged Awamori and Ippanshu. In a stepwise discriminant analysis procedure, 91 of 95 samples were rightly classified by 7 volatile compounds (diacetyl, ethyl isovalerate, isoamyl acetate, propyl caprate, ethyl crotonate, vanillin, and DMTS). Estimating the accuracy of the discriminant analysis by cross validation, the ratios of appropriate classification were 92.6%. For Awamori and the other Shochu, there was a significant difference in 59 of 84 volatile compounds. A total of 256 of 260 samples were rightly classified by 6 volatile compounds (isobutyl alcohol,1-octen-3-ol, nerolidol, 2-methylbutyl acetate, methyl salicylate, and ethyl S-methyl thioacetate). When estimating the accuracy of the discriminant analysis, the ratios of appropriate classification were 98.1%. In addition, volatile compounds changing due to aging were investigated.

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In this study, we performed an interlaboratory study of the determination of ethanol concentration by steam distillation equipment using the gravimetric method, based on the AOAC guidelines, to investigate the accuracy. Eleven laboratories participated in analyzing six representative sake samples. A statistical treatment revealed that the relative standard deviation of repeatability (RSD_r) of alcohol ranged from 0.13 % to 0.35 % in the samples. The interlaboratory relative standard deviation of reproducibility (RSD_R) of alcohol ranged from 0.20 % to 0.38 %, respectively. The HORRAT values of six representative sake samples calculated from the Horwitz equation ranged from 0.08 to 0.14 in six samples, respectively. Thus, we showed that this method yields superior results in the repeatability and interlaboratory reproducibility and has validity.

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