Citation:
XIAO Tian-Peng, ZHENG Xiao-Feng, LV Ji-Hong, GUO Ze-Feng, GAO Feng, LIU Chun-Feng, LI Qi. Detection of Pyrazine Compounds in Cocoa Wort by Gas Chromatography with Headspace Solid Phase Micro-Extraction[J]. Chinese Journal of Analytical Chemistry,
;2012, 40(10): 1589-1592.
doi:
10.3724/SP.J.1096.2012.20324
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A headspace solid phase microextraction (HS-SPME), followed by gas chromatographic method was established for the detection of three pyrazine compounds (2,5-dimethyl pyrazine, 2,3,5-trimethyl pyrazine and 2,3,5,6-tetramethyl pyrazine) in cocoa wort. Equilibrium temperature and equilibrium time were optimized by using different SPME heads. According to the results of the optimization experiments, the following conclusion can be drawn:The cocoa wort sample was efficiently extracted under 40℃ for 40 min with 75 μm CAR/PDMS SPME head. The method had linear response within 1-500 mg/L, and the detection limits (S/N=3) were below 0.023 μg/L. The relative standard deviations were from 3.6%-6.4% and the recoveries were from 95.4% to 102.7%. This method is characterized by rapidly, high sensitivity, good linearity and repeatability for the analysis of cocoa wort samples.
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