Method and system for determining stable carbon isotope of acetic acid in Maotai-flavor liquor

Abstract

The invention belongs to the technical field of measurement in liquor industry, and discloses a method and a system for determining a stable carbon isotope of acetic acid in Maotai-flavor liquor. Themethod comprises the following steps: extracting the acetic acid in a Maotai-flavor liquor sample by using a NeedlEX fatty acid type extraction needle, carrying out aging treatment and thermal desorption on filler of the Maotai-flavor liquor sample, pulling an air extracting pump, and enabling volatile substances of the acetic acid to be taken away along with helium so as to be pumped out by the pump and flow through a needle type extraction head; absorbing organic acid of the acetic acid with multi-molecular polymer particles having specificity for acids; injecting nitrogen into the extraction needle and blowing the nitrogen into a gas chromatography (GC) sample injector; adopting a gas chromatography-combustion-stable isotope ratio mass spectrometry (GC-C-IRMS) to determine the delta 13Cvalue in CO2 produced by combustion of the acetic acid; controlling the temperature of a sample inlet to be 250 DEG C. The invention establishes a solid-phase micro-extraction technology for extracting the acetic acid from the Maotai-flavor liquor and provides an analytical method for determining the acetic acid in the Maotai-flavor liquor after separation by a gas chromatographic column, thus providing a detection means for filling the gap of the determination of the stable carbon isotope of the acetic acid in the Maotai-flavor liquor.

Description

technical field [0001] The invention belongs to the technical field of wine industry measurement, and in particular relates to a method and system for measuring the carbon stable isotope of acetic acid in Maotai-flavor liquor. Background technique [0002] Maotai-flavored liquor is one of the five business cards that Guizhou Province is currently striving to create, and the creation of business cards cannot do without the traceability of the brand. The traceability work can establish a traceability technical system for high-quality liquor, which helps to highlight the brand, protect the business card liquor industry, and prevent counterfeiting and shoddy. At present, the commonly used traceability methods include laser labeling and fluorescent anti-counterfeiting technologies. At the same time, the traceability of the trace component map and the carbon isotope traceability of the major component (ethanol) are also being explored. These studies have led a new direction of li...

AI Technical Summary

Problems solved by technology

[0004] To sum up, the existing problems in the prior art are: the prior art does not use the NeedlEX fatty acid type extraction needle combined with solid-phase microextraction technology to extract acetic acid in Maotai-flavored liquor, and determine the amount of acetic acid in Maotai-flavored liquor after separation by gas chromatography column. acetic acid, resulting in poor accuracy in the determination of acetic acid carbon stable isotope in Maotai-flavor liquor

Images