Analysis of Aroma Compounds in Two Kinds of Grapefruit Juice by Solid Phase Microextraction and GC-Olfactometry

A total of 45 and 41 compounds were detected in white grapefruit juice and red grapefruit juice with total relative contents of 84.43% and 89.16% by solid phase microextraction coupled with gas chromatography-mass spectrometry,respectively.Meanwhile,20 and 21 aromatic compounds were also identified in both kinds of juice by GC-Olfactometry.The 3-hydroxyl ethyl butyrate,geranyl acetate and RI = 1006(piney,fresh and fruity) were the major aroma compounds in white grapefruit juice.The compounds with strong aromatic intensity were 2-methyl ethyl propionate,2-methyl ethyl butyrate,trans-2-hexene-1-ol,heptanal,1-octen-3-ol,α-terpinene,3-hydroxyl ethyl hexanoate,carvone and three unknown compounds(RI = 971,1156 and 1390) in red grapefruit juice.The odor profile showed that white grapefruit juice and red grapefruit juice mainly presented as fruity odor and wood/leaf odor,respectively.