Improvement of national standard detection method for total ester content in Baijiu
In order to improve the total ester determination method stipulated in GB/T 10345-2022"Method of analysis for Baijiu",to reduce unnec-essary chemical reagent consumption and save back titration time,using Baijiu sample as the research object,according to the volume of sodium hy-droxide required to neutralize free acid,the amount of sodium hydroxide added to the Baijiu sample to completely saponify was predicted,and the volume of sodium hydroxide for saponification was calculated using the difference formula.The results showed that the Baijiu sample could be com-pletely saponified when the volume of sodium hydroxide for saponification was 45 ml.The difference method was used to determine the total ester content in Baijiu with the formula Y=X-MOD(X,5)+15,and the volume of NaOH added to satisfy the complete saponification of the sample was calcu-lated.The relative deviation between the improved method and the national standard results was less than 2.91％.The recovery rates were 95.68％-99.65％,and the relative standard deviations(RSD)of precision tests results were 0.11％-0.76％,all of which met the detection requirements.
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