Journal
NATURAL PRODUCT RESEARCH
Volume 27, Issue 13, Pages 1179-1185Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/14786419.2012.718771
Keywords
Callistemon viminalis; Myrtaceae; pyrroline; triterpenes; sterols; tannins; antioxidant
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One new compound: 3,4-dihydro-2-(hydroxymethyl)-4-methyl-2H-pyrrol-2-ol (5) was isolated from the fruits and bark of Callistemon viminalis along with the known compounds lupeol (1), octacosanol (2), -sitosterol (3), betulin (4), betulinic acid (6), ursolic acid (7), corosolic acid (8), -sitosterol-3-O--D-glucoside (9), methyl gallate (10), gallic acid (11), catechin (12), ellagic acid (13) and 3-O-acetylursolic acid (14) (compound 14 was isolated from the bark and not detected in the fruits). Structures of these compounds were elucidated on the basis of their spectroscopic data (NMR, MS, IR spectra and COSY and HR-MS for 5a). The antioxidant activity of the total extracts, petroleum ether, CH2Cl2 and EtOAc fractions together with the compounds 6, 7, 9, 10, 11, 12 and 13 was comparable with that of the standard antioxidant, ascorbic acid.
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