Analysis of Volatile Components of Non-Tobacco Flavored e-Liquids by Combining HS-SPME-GC-MS with Chemometrics
Headspace solid-phase microextraction combined with gas chromatography-mass spectrometry(HS-SPME-GC-MS)analytical method was established for the analysis of volatile components in e-liquids.The detection method has the advantages of low sample consumption,simple pre-treatment procedure and short sample analysis time.Combined with chemometric methods,the quantitative data were analyzed by principal component analysis,cluster analysis and heat map analysis.The differences in volatile components between different flavored e-liquid and the results of sample clustering can be visualized.The contents of ethyl maltol and γ-decalactone were significantly higher in three strawberry-flavored e-liquid;the contents of acetic acid and 2-hydroxypropyl acetate were relatively higher in two cherry-flavored e-liquid;ethyl butyrate with banana aroma was the highest concentration in banana-flavored samples,and the content of vanillin was especially prominent in cocoa-flavored e-liquid,which provided a strong milky aroma.A total of 17 volatile components contributing to flavor differentiation were extracted to provide reference for the identification and regulation of the detection of non-tobacco flavored e-liquids.
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