Chemical Constituents of Supercritical Extracts from Alpinia officinarum and the Feeding Deterrent Activity against Tribolium castaneum.

has been confirmed to possess bioactivities against some pests. In this work, a sample was obtained from rhizomes by supercritical fluid CO₂ extraction (SFE). According to GC-MS analysis, the main chemical components for SFE-sample included benzylacetone (26.77%), 1,7-diphenyl-5-hydroxy-3-heptanone (17.78%), guaiacylacetone (10.03%) and benzenepropanal (7.42%). The essential oil of rhizomes (LD = 20.71 μg/adult) exhibited more contact toxicity than SFE extract (LD = 82.72 μg/adult) against . From SFE extracts, one new compound, 1-phenyl-4-(16,17-dimethyl-9,13-octadiene)-5-isopentenyl-7-(4"-methoxyl-3"-hydroxyl-phenyl)-3-heptanone (), together with five known compounds identified as 5-hydroxy-1,7-diphenyl-3-heptanone (), 1,7-diphenyl-4-hepten-3-one (), galangin (), galangin-3-methyl ether () and pinocembrin (), were isolated and their feeding deterrent activities against adults were assessed. It was found that compounds - had feeding deterrent activities against with feeding deterrent indices of 18.21%, 18.94%, 19.79%, 26.99%, 20.34%, and 35.81%, respectively, at the concentration of 1500 ppm. Hence, the essential oil and SFE extracts/compounds of rhizomes represent promising alternatives in the control of adults.