Abstract
Characteristic volatile profiles of quinoas were analyzed by gas chromatography–ion mobility spectrometry (GC-IMS) and principal component analysis (PCA). A total of 28 characteristic volatile compounds were detected in quinoas of WQ (white quinoa), RQ (red quinoa) and BQ (black quinoa), and aldehydes (23.99%~36.81%), alcohols (22.65%~26.50%), ketones (12.30%~19.97%), acids (9.69%~10.10%) and esters (13.30%~30.99%) were common in quinoas. Hexanal (5.47%~16.86%), acroleine (9.13%~12.68%), ethanol (9.17%~11.89%), 2-propanol (4.99%~6.19%), 2-propanone (9.72%~12.96%), propanoic acid (5.56%~6.30%), and propyl butanoate (9.02%~21.14%) were dominant in quinoas, and significant different (p < 0.05) content of these volatile compounds were presented in different quinoas. For the highest content of volatile compounds in different quinoa sample, WQ was characterized by hexanal, pentanal, phenylacetaldehyde, 1-hexanol, 2-pentanol and 1-pentanol, RQ was characterized by 2,3-butanedione, 2-butanone, 2-propanone, butyrolactone, 2-methylpropanol, 2-methylbutanol, acroleine, propanal and butanal, BQ could be characterized by heptanal, 2-propanol, butyl acetate, ethanol, ethyl acetate, butyl propanoate, propyl butanoate and ethyl hexanoate, respectively according to PCA. In conclusion, visual plots of GC-IMS well agreed with PCA, and their combination was excellent for the characterization of aroma profiles of different quinoas.
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