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Analysis of Nitrogen-Containing Compounds of Guojing Sesame-flavour Liquor by Liquid-liquid Extraction Coupled with GC-MS and GC-NPD

WANG Bo-wen1,2, LI He-he1,2, ZHANG Feng-guo3, XIN Chun-hui3, SUN Jin-yuan1,2,*, HUANG Ming-quan1,2, SUN Bao-guo1,2   

  1. 1. Beijing Key Laboratory of Flavor Chemistry, Beijing Technology and Business University, Beijing 100048, China;
    2. Beijing Laboratory for Food Quality and Safety, Beijing Technology and Business University, Beijing 100048, China;
    3. Technology Center of Bandaojing Co. Ltd., Gaoqing 256300, China
  • Online:2014-05-25 Published:2014-05-29
  • Contact: SUN Jin-yuan

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Abstract:

In the present study, the nitrogen-containing compounds of Guojing sesame-flavor liquor were analyzed by liquidliquid
extraction coupled with gas chromatography-mass spectrometry (GC-MS) and GC-nitrogen phosphorus detection (GC-NPD).
Using a simulated liquor sample, the optimum experimental conditions were determined as follows: the sample was adjusted
with 4 mol/L HCl to a H+ concentration of 1 mol/L, concentrated, and extracted with freshly distilled diethyl ether to remove
acidic and neutral components; the aqueous phase was adjusted to pH 9 and its alkaline components were extracted into freshly
distilled diethyl ether. After concentration, the analysis by GC-MS and GC-NPD was carried out. A total of 31 nitrogen-containing
compounds were detected in Guojing sesame-flavor liquor, of which, 23 compounds were identified by comparing them with
authentic standards, including 14 pyrazines, 1 pyrrole, 4 pyridines, 1 thiazole, 1 oxazole and 2 other compounds.

Key words: liquid-liquid extraction, gas chromatography-mass spectrometry (GC-MS), gas chromatography-nitrogen phosphorus detector (GC-NPD), sesame-flavor liquor, nitrogen-containing compounds

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