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Rapid measuring method for carbon acetate stable isotope in table vinegar

A stable isotope, rapid determination technology, applied in measuring devices, instruments, scientific instruments, etc., can solve the problems of time-consuming and laborious operation, affecting the accuracy of results, etc., and achieve the effect of less sample consumption, simple method, and promotion of technological progress.

Active Publication Date: 2013-03-13
CHINA NAT RES INST OF FOOD & FERMENTATION IND CO LTD
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Problems solved by technology

The first method adopts distillation and purification to avoid the isotope fractionation of acetic acid in the pretreatment, and requires a special distillation device to ensure the extraction effect of acetic acid, and the operation is time-consuming and laborious; the second method uses solid-phase microextraction technology to extract acetic acid in vinegar. The efficiency of the extraction head will cause different degrees of acetic acid isotope fractionation, which will affect the accuracy of the results

Method used

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  • Rapid measuring method for carbon acetate stable isotope in table vinegar
  • Rapid measuring method for carbon acetate stable isotope in table vinegar
  • Rapid measuring method for carbon acetate stable isotope in table vinegar

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Embodiment 1

[0027] 1 Material method

[0028] 1.1 Instrument

[0029] Triplus autosampler (Thermofisher Company), gas chromatograph (Trace GC, Thermofisher Company), combustion conversion device (IsoLink, Thermofisher Company), stable isotope ratio mass spectrometer (DeltaV Advantage, Thermofisher Company), etc.

[0030] 1.2 Reagents

[0031] Ethanol (domestic chromatographically pure), glacial acetic acid (domestic analytically pure, EA-IRMS calibrated δ 13 C VPDB =-26.41±0.15‰), fruit vinegar (the second round of international comparison samples of FIT-PTS in 2011).

[0032] 1.3 Chromatographic conditions

[0033] Wax capillary column (30m×0.25mm×0.25μm); the carrier gas is helium; the column flow rate is 1.2mL / min; the inlet temperature is 300°C; The temperature was raised to 200°C and kept for 2 minutes; the injection volume was 1 μL; the split ratio was 20:1.

[0034] 1.4 Acetic acid conversion conditions

[0035] Ceramic (Al 2 o 3 ) oxidation tube (fillers are CuO, NiO and ...

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Abstract

The invention relates to a rapid measuring method for carbon acetate stable isotope in table vinegar. The rapid measuring method uses a gas chromatography-combustion-isotope ratio mass spectrography (GC-C-IRMS) to measure, and comprises a step of adopting alcohol to dilute a table vinegar sample, and a step of using gas chromatograph (GC) to separate acetic acid in the diluted sample. The rapid measuring method disclosed by the invention uses GC-C-IRMS to achieve rapid measurement for carbon acetate stable isotope in table vinegar, thus solving a technical difficulty that a series of pre-treatments are needed for purifying acetic acid before measuring the carbon acetate stable isotope in the table vinegar, improving the carbon acetate stable isotope measuring technology, and providing a technical method for identifying whether cereals vinegar and fruit vinegar products are true or false.

Description

technical field [0001] The invention belongs to the technical field of stable isotope analysis, and relates to a rapid determination method for the stable carbon isotope of acetic acid in vinegar, specifically the technical research of separating and purifying acetic acid by gas chromatography and measuring its stable carbon isotope, which can be used in vinegar (grain vinegar and Fruit vinegar) quality identification analysis. Background technique [0002] Vinegar is one of the important drinks in daily life. According to the different processes, it can be divided into brewed vinegar and formulated vinegar[1,2]. Brewed vinegar can be divided into grain vinegar and fruit vinegar according to the different fermentation raw materials. Fruit vinegar drink is popular in developed countries in the world because of its unique flavor and health care function, and is called "the fourth generation golden drink". Due to price differences among different products, it is unavoidable th...

Claims

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Application Information

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IPC IPC(8): G01N30/02G01N30/06
Inventor 钟其顶王道兵熊正河
Owner CHINA NAT RES INST OF FOOD & FERMENTATION IND CO LTD
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