Antioxidant activity and characterization of volatile constituents of Taheebo (Tabebuia impetiginosa Martius ex DC).
Volatiles were isolated from the dried inner bark of Tabebuia impetiginosa using steam distillation under reduced pressure followed by continuous liquid-liquid extraction. The extract was analyzed by gas chromatography and gas chromatography-mass spectrometry. The major volatile constituents of T. impetiginosa were 4-methoxybenzaldehyde (52.84 microg/g), 4-methoxyphenol (38.91 microg/g), 5-allyl-1,2,3-trimethoxybenzene (elemicin; 34.15 microg/g), 1-methoxy-4-(1E)-1-propenylbenzene (trans-anethole; 33.75 microg/g), and 4-methoxybenzyl alcohol (30.29 microg/g). The antioxidant activity of the volatiles was evaluated using two different assays. The extract exhibited a potent inhibitory effect on the formation of conjugated diene hydroperoxides (from methyl linoleate) at a concentration of 1000 microg/mL. The extract also inhibited the oxidation of hexanal for 40 days at a level of 5 microg/mL. The antioxidative activity of T. impetiginosa volatiles was comparable with that of the well-known antioxidants, alpha-tocopherol, and butylated hydroxytoluene.
Park
Byeoung-Soo
BS
Western Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture, Albany, California 94710, USA.
Lee
Kwang-Geun
KG
Shibamoto
Takayuki
T
Lee
Sung-Eun
SE
Takeoka
Gary R
GR
D000081248:Allylbenzene Derivatives; D000840:Anisoles / Q000032:analysis / Q000494:pharmacology; D000975:Antioxidants / Q000032:analysis* / Q000494:pharmacology*; D001547:Benzaldehydes / Q000032:analysis / Q000494:pharmacology; D002849:Chromatography, Gas; D008401:Gas Chromatography-Mass Spectrometry; D019684:Magnoliopsida / Q000737:chemistry*; D010084:Oxidation-Reduction; D024301:Plant Bark / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry*; D011748:Pyrogallol / Q000031:analogs & derivatives* / Q000032:analysis / Q000494:pharmacology; D014835:Volatilization
D000081248:Allylbenzene Derivatives; D000840:Anisoles; D000975:Antioxidants; D001547:Benzaldehydes; D010936:Plant Extracts; D011748:Pyrogallol; C002135:elemicin; C009760:mequinol; C066943:anisyl alcohol; C006578:anethole