Antioxidant activities of ethanolic extracts from the twigs of Cinnamomum osmophloeum

Cinnamomum osmophloeum Kaneh. is an indigenous tree species in Taiwan. In this study, phytochemical characteristics and antioxidant activities of ethanolic extracts from the twigs of C. osmophloeum were investigated for the first time. The extracts were obtained successively using liquid–liquid part...

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Bibliographic Details
Published in:Bioresource technology 2008-04, Vol.99 (6), p.1918-1925
Main Authors: Chua, Meng-Thong, Tung, Yu-Tang, Chang, Shang-Tzen
Format: Article
Language:English
Subjects:
Animals
Antioxidant activity
Antioxidants - chemistry
Antioxidants - metabolism
Biological and medical sciences
Biphenyl Compounds - chemistry
Brain - metabolism
Cinnamomum
Cinnamomum - metabolism
Cinnamomum osmophloeum
Ethanol - chemistry
Extracts
Free Radicals
Fundamental and applied biological sciences. Psychology
Hydrazines - chemistry
Light
Lipid Peroxidation
Luminescence
Mice
Phenol - chemistry
Photochemiluminescence assay
Picrates
Plant Extracts - metabolism
Superoxides - chemistry
Trees
Twigs
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Summary:Cinnamomum osmophloeum Kaneh. is an indigenous tree species in Taiwan. In this study, phytochemical characteristics and antioxidant activities of ethanolic extracts from the twigs of C. osmophloeum were investigated for the first time. The extracts were obtained successively using liquid–liquid partition to yield n-hexane (Hex), ethyl acetate (EtOAc), n-butanol (BuOH) and water fractions. The antioxidant activities of C. osmophloeum twig extracts were examined using various antioxidant assays, such as DPPH, NBT, reducing power, lipid peroxidation using mouse brain homogenates, metal chelating ability, and photochemiluminescence (PCL). In addition, total phenolic contents were also determined. Results revealed that the BuOH fraction exhibited the best performance in DPPH assay, NBT assay, reducing power assay and lipid peroxidation using mouse brain homogenates assay. Furthermore, the BuOH fraction has the highest total phenolic contents (496.7 mg of GAE/g). Consequently, kaempferol-7- O-rhamnoside was also isolated from the antioxidative BuOH fraction and its activity was also confirmed. These results demonstrated that ethanolic extracts of C. osmophloeum twigs have excellent antioxidant activities and thus it has great potential as a source for natural health products.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2007.03.020