Gas Chromatography-mass Spectrometry for Analyzing TXIB Migration in Plastics in Contact with Chinese Baijiu
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Abstract:
Liquid-liquid extraction and gas chromatography-mass spectrometry (GC-MS) was used to establish a quantitative method for measuring the leaching of 2,2,4-trimethyl-1,3-pentanediol diisobutyrate (TXIB) in plastics in contact with Chinese Baijiu. Food simulants were used to prepare a simulated soaking solution for measuring the leaching of common plastic materials. N-Hexane was used as an extraction solvent. The volume of extraction solvent was 2 mL, and the shaking extraction time was 1 min. The extract was separated by HP-5 ms (30 m×0.25 mm×0.25 μm) capillary chromatography, analyzed by GC-MS with selective ion monitoring, and quantified using an external standard. The results show that this method can be used to rapidly measure the quantity of TXIB leached from plastic materials into Baijiu, which is reflected by the regression line correlation coefficient (r=0.9975), limit of quantification (0.02 mg/kg), recovery (106.60%~119.90%), and relative standard deviations (2.30%~6.50%). This method is rapid, sensitive, and accurate, and is suitable for evaluating TXIB leaching from plastics in contact with Baijiu.
