AppIication of the δ13C of EthanoI in Vinegar for Distinguishing the FaIse from the Genuine
The determination method of the δ13C of ethanol in vinegar is built by LC-IRMS;the operational process of the instruments is introduced, through the selection of chromatography column,the effect of other components (sugar,acid)on the δ13C of ethanol in vinegar is detected from the perspective of peak time.The δ13C of pure CO2 reference gas is calibrated via international standard substance-sugar and the determination accuracy and stability in the linear range are investigated.16 batches of representative samples are determined;the relationship of theδ13C among ethanol in vinegar,vinegar,vinegar sediment is analyzed.Theδ13C of ethanol in vinegar is -28‰~-31‰,it is different from others,less than theδ13C of vinegar,it is stated that the loss happens in the process of transformation ofδ13C.Use the analysis method to test theδ13C of a variety of alcohol which is common in market,the δ13C is-10‰ ~ -17‰ of industrial alcohol,corn edible alcohol, starch alcohol,theδ13C is -29.1‰±1.2‰ of rice alcohol,theδ13C is -17.6‰±1.3‰ of sorghum alcohol,only the rice alcohol intervals coincide with the δ13C of ethanol in vinegar,others can be easily distinguished,the determination of the δ13C of ethanol in vinegar can play the role in distinguishing the false from the genuine.
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