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Comparison of relative contents of some volatile components of Rhizoma Alpiniae Officinarum by hydrodistillation, HS-SPME and diethyl ether extraction. 1: α-farnesene; 2: γ-muurolene; 3: p-menth-1-en-8-ol; 4: eucalyptol; 5: 2,6-dimethyl-6-(4-methyl-3-pentenyl) bicyclo[3.1.1]hept-2-ene; 6: isocaryophillene; 7: cadinol; 8: cadina-1(10),4-diene; 9: caryophyllene; 10: (Z,Z,Z)-1,5,9,9-tetramethyl-1,4,7-cycloundecatriene; 11: benzyl acetone 12: benzenepropanal.
