Analysis of Ethanol in Liquors Using Nexis™ GC-2030

Introduction

The Japanese National Tax Agency (NTA) prescribes analytical methods for ethanol in liquors, which are official methods. Various analytical methods are included, and the prescribed GC method is isothermal gas chromatography with a column oven condition at 50 °C. However, since the water and high-boiling- point components in the liquor are not eluted from the column during isothermal analysis at 50 °C, it is not possible to perform a favorable analysis without expelling them by raising the oven temperature after the elution of ethanol and internal standard substances. In addition, since the major component of liquors is moisture, the amount and position of the wool in the insert need to be fine-tuned. In this article, the ethanol in samples of beer, liqueur and Japanese sake was quantified using a method that made it possible to perform analysis in accordance with the NTA's ethanol analysis favorably in a short time.

June 25, 2023 GMT