Abstract:

Chemical composition of supercritical CO2 extracts of seed ginger and fresh ginger were analyzed by using GC-MS. Results indicated that the oleoresin yields of seed ginger and fresh ginger are 5.15% ± 0.12% and 4.67% ± 0.15%，respectively. No differences exist on chemical compositions between the two extracts, which mainly contain α-zingiberene, β-sesquiphellandrene, β-bisobolene, α-farnesene, α-curcumene, 6-gingerol, 6-shogaol and zingerone. However, the contents of these compounds are different significantly. The seed ginger extract contains less terpenoids than the fresh ginger extract, namely 1,8-cineole, β-citronellal, citral, geraniol, geranyl acetate, α-zingiberene and the other two terpenoids of γ-selinene, germacrene D are only detected in fresh ginger extract. The relative content of α-curcumene in seed ginger extract is higher than that in fresh ginger extract. Seed ginger extract also possesses more gingerols than fresh ginger by 7.86%, especially 6-shogaol and 10-shogaol, whose relative contents are higher 15.49% and 30.51% than those in fresh ginger extract.

Key words: seed ginger, fresh ginger, chemical composition, GC-MS