T/SXITS 0002-2023 The analysis method for the brewing starter of light aroma Baijiu

Scope

Scope: This document specifies the general analysis methods for aromatic-type liquor brewing starter products, including sensory testing and physical and chemical analysis. This document is applicable to the analysis of aromatic-type liquor brewing starter products; Main technical content: 2. 2.1 Sampling The sampling of the working samples was conducted by experienced starter technicians. The technicians made basic judgments based on the sensory characteristics of the starter and sampled the products according to their types and grades. They also conducted detailed sensory evaluation descriptions of each sample to determine the representativeness of the samples. 2.2 Establishment of the esterification force method The esterification force method specified in QB/T 4257-2011 "General Analysis Methods for Brewing Starters" is as follows: - Extract 1.5 mL of acetic acid into a 250 mL conical flask, add 25 mL of anhydrous ethanol, shake slightly, and then add 75 mL of distilled water. Mix well. - Weigh out 25 g of dry sample, accurate to 0.01 g, and add it to the conical flask. Shake well, seal with a stopper, and place in a 35 °C incubator for 7 days of esterification. Conduct a blank test simultaneously. - Transfer all the sample solutions after 7 days of esterification into a 250 mL distillation flask. Measure 50 mL of 30% ethanol solution and rinse the conical flask several times with the rinsing solution, which is also poured into the distillation flask. Collect the distillate using a 50 mL volumetric flask (cooled with ice water). Gradually heat and distill until the collected distillate approaches the marking line. Remove the volumetric flask, adjust the temperature to 20 °C, and mix well. - Saponify and titrate. Pour the distillate into a 250 mL conical flask with two drops of phenolphthalein. Neutralize with sodium hydroxide standard solution (0.1 mol/L) and record the volume of sodium hydroxide consumed. Then add 25 mL of sodium hydroxide stand

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