Comparison of Volatile Compounds in Michelia figo Tepals under Different Weather Conditions
[Objective]In order to further explore the differences in volatile components of Michelia figo under different weather conditions.[Method]In this study,we used Michelia figo as the experimental material,headspace solid phase microextraction combined with gas chromatography-mass spectrometry was used to determine the difference of volatile substances on sunny and cloudy days,and the aroma intensity(OAV)was analyzed.[Result]A total of 45 volatile compounds were detected in the tepals of Michelia figo,mainly including sesquiterpenes(18 types)and esters(11 types).Among them,37 and 33 volatile compounds were detected on sunny and cloudy days,respectively,and the volatile content on sunny days(106.07 μg/kg)was significantly higher than that on cloudy days(53.50 μg/kg).There were 19 main components in these volatiles,and the content of β-elemene was the highest on sunny and cloudy days(35.52 and 26.62 μg/kg,respectively).The contents of isobutyl acetate,ethyl isobutyrate,ethyl hexanoate and isobutyl caproate on sunny days were significantly higher than those on cloudy days.Isobutanol,Isobutanol,Selina-3,7(11)-diene,γ-Carotene,ethyl acetate,and Ethyl-2-Methylbutyrate were detected on cloudy days.OAV analysis showed that there were six characteristic aroma components in the tepals of Michelia figo.The OAV of isobutyl acetate and ethyl isobutyrate on sunny days were as high as 646.00 and 69.60,respectively,which were significantly higher than those on cloudy days,while the OAV of β-elemene was highest on cloudy days.[Conclusion]There were significant differences in the number,content and aroma intensity of volatile components in Michelia figo on sunny and cloudy days.Differences in the content of compounds such asβ-elemene,isobutyl acetate,and ethyl isobutyrate were the main reasons for the difference in the floral aroma of the two types of weather.
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