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http://dx.doi.org/10.5352/JLS.2013.23.7.913

Phenolic Content, DPPH Radical Scavenging, and Tyrosinase Inhibitory Activities of Ecklonia cava Extracted with the Ultrasonic Wave Method  

Kim, So Jung (Kyeongbuk Institute for Marine Bio-Industry)
Kim, Donggiun (Department of Biological Science, Silla University)
Park, Jongbum (Department of Biological Science, Silla University)
Lee, Taek-Kyun (South Sea Environment Research Department, Korea Institute of Ocean Science and Technology)
Publication Information
Journal of Life Science / v.23, no.7, 2013 , pp. 913-918 More about this Journal
Abstract
The applicability of the ultrasonic wave method to the extraction of useful components from seaweeds was investigated. Extracts from freeze-dried Ecklonia cava powder were prepared with hot water ($65^{\circ}C$), water ($24^{\circ}C$), 50% ethanol, and 100% ethanol, and ultrasonic extraction was also performed. The content of phenolic compounds and the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity and tyrosinase inhibitory activity of the extracts were analyzed, and differences in the data obtained by the ultrasonic extraction and the traditional extraction methods were compared. The phenolic content in the E. cava extract by ultrasonic extraction (142.80 mg/g) was approximately 14 times higher than the phenolic content in the hot water extract (10.03 mg/g). The DPPH radical scavenging and the tyrosinase inhibitory activities of the ultrasonic extract were approximately 4 times and 14 times higher than the hot water extracts, respectively. The correlation between the phenolic content and the DPPH radical scavenging activity ($R^2$=99.47) and between the phenolic content and the tyrosinase inhibitory activity ($R^2$=99.99) was very high. These results indicate that ultrasonic extraction is more suitable than traditional extraction for the extraction of useful components from E. cava.
Keywords
Ultrasonic extraction; Ecklonia cava; phenolics; DPPH assay; tyrosinase inhibitory activity;
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