Comparison of LLE and SPME Methods for Screening the Aroma Compounds in Rum.

Liquid–liquid extraction (LLE) and solid-phase microextraction (SPME) methods were applied to extract the aroma compounds of rum. Aroma compounds were separated and analyzed with gas chromatography–mass spectrometry of DB-WAXetr capillary columns. One hundred and twelve compounds, including alcohols, esters, aldehydes, ketones, phenols, acids, and other compounds, were identified by two extraction methods. Among them, 88 and 74 compounds were identified by SPME and LLE, respectively. SPME and LLE methods were suitable for the qualitative and semi-quantitative analysis of rum, respectively. Principal component analysis results showed that the first principal component (PC1) and the second principal component (PC2) explained 80.9% of the difference in variable samples (PC1 = 52.7%, PC2 = 28.2%), which can represent the variable characteristics of the samples. The extraction effects of LLE and SPME on the aroma compounds of rum obviously differed, however, the aroma compounds obtained by the two extraction methods can complement each other. Supplemental data for this article is available online at at [publisher's weblink]. [ABSTRACT FROM AUTHOR]