Publication: Hypocholesterolemic and antioxidant effects of aqueous extracts from the dried calyx of Hibiscus sabdariffa L. in hypercholesterolemic rats
Issued Date
2006-01-16
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03788741
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2-s2.0-29144478796
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Mahidol University
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SCOPUS
Bibliographic Citation
Journal of Ethnopharmacology. Vol.103, No.2 (2006), 252-260
Suggested Citation
Vilasinee Hirunpanich, Anocha Utaipat, Noppawan Phumala Morales, Nuntavan Bunyapraphatsara, Hitoshi Sato, Angkana Herunsale, Chuthamanee Suthisisang Hypocholesterolemic and antioxidant effects of aqueous extracts from the dried calyx of Hibiscus sabdariffa L. in hypercholesterolemic rats. Journal of Ethnopharmacology. Vol.103, No.2 (2006), 252-260. doi:10.1016/j.jep.2005.08.033 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/23909
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Title
Hypocholesterolemic and antioxidant effects of aqueous extracts from the dried calyx of Hibiscus sabdariffa L. in hypercholesterolemic rats
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Abstract
The present study was designed to investigate the hypolipidemic effects and antioxidant effects of Hibiscus sabdariffa L. (roselle) with regard to protection of LDL oxidation in vivo and ex vivo in rats made hypercholesterolemic by continuous cholesterol feeding. Administering the dried calyx extracts of roselle at doses of 500 and 1000 mg/kg together with continuous cholesterol feeding to hypercholesterolemic rats for 6 weeks significantly decreased serum cholesterol level by 22% and 26%, respectively (p < 0.001); serum triglycerides level by 33% and 28%, respectively (p < 0.05); serum LDL level by 22% and 32%, respectively (p < 0.05). However, serum HDL level was not affected. LDL was extracted from plasma of the hypercholesterolemic rats and the effects of the dried calyx extracts of roselle on the oxidation of LDL in vivo and ex vivo were examined. Six-week treatment with 250, 500 and 1000 mg/kg of the extracts significantly decreased thiobarbituric acid reactive substances (TBARs) formation (p < 0.05) while the formation of conjugated dienes during the oxidation of LDL induced by CuSO4was reduced, but not significantly different. These lines of evidence suggest that the aqueous extracts from the dried calyx of roselle possess both antioxidant effects against LDL oxidation and hypolipidemic effects in vivo. However, its mechanism(s) of action remains to be elucidated. © 2005 Elsevier Ireland Ltd. All rights reserved.