Antioxidant and Antimicrobial Properties of a Brown Alga Scytosiphon lomentaria
Xiao Juan Xu, Yu Zhang, Hong Lin, Chao Kang, Xiao Ting Fu** Author for corresponding; e-mail address: xiaotingfu@ouc.edu.cn
Volume: Vol.44 No.2 (April 2017)
Research Article
DOI:
Received: 9 March 2012, Revised: -, Accepted: 3 Febuary 2013, Published: -
Citation: Xu X.J., Zhang Y., Lin H., Kang C. and Fu X.T., Antioxidant and Antimicrobial Properties of a Brown Alga Scytosiphon lomentaria, Chiang Mai Journal of Science, 2017; 44(2): 595-604.
Abstract
The antioxidant activities and antimicrobial activities of dried Scytosiphon lomentaria, a brown alga, were studied in this research. Four isolation methods were adopted for the extraction of total phenols. The yield of total phenols was in the order of hot-water extract > ethanol extract > hot-water/ethanol extract > cold-water/ethanol extract. Antioxidant activities of extracts prepared by the above isolation methods were tested, including 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical-scavenging, ferrous ion chelating, reducing power, scavenging of hydroxyl radical, and anti-lipid peroxidation activities. A hot water extract showed strong antioxidant activities in assays including DPPH radical-scavenging, ferrous ion chelating, and reducing power. On the other hand, a cold water/ethanol extract displayed the highest hydroxyl radical scavenging activity and anti-lipid peroxidation effect, and higher than the control. The hot-water and ethanol extracts of S. lomentaria showed similar antimicrobial activity on Escherichia coli, the growth-free zone of inhibition was 11 mm, 9 mm respectively. The result indicated that S. lomentaria is an excellent resource with application potential as a healthy food.
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