Gas chromatography-mass spectrometry(GC-MS)was used to analyze the components of white birch wood vinegar and white birch leaf extract.The experimental results showed that the main components of refined white birch wood vinegar were dimethly ether(relative content 11.33%),oxalic acid(relative content 4.07%),3-(2-chloro-5-hydroxyphenyl)-2-methyl-4(3H)-quinazolinone(relative content 1.76%),etc.The main components of white birch leaf extract are cyclobutanol(relative content 3.09%)and formic acid ethenyl ester(relative content 2.53%).The results of antioxidant experiments showed that both white birch wood vinegar and white birch leaf extract had good effects on DPPH free radical scavenging rate.The IC50 of white birch wood vinegar was(37.093±0.511)g/L,and the IC50 of white birch leaf extract was(0.193±0.002)g/L.3-(2-chloro-5-hydroxyphenyl)-2-methyl-4(3H)-quinazolinone is potential quinazolinone derivative ofwhite birch wood vinegar.
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