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http://dx.doi.org/10.3746/jfn.2005.10.2.134

Screening for Angiotensin 1-Converting Enzyme Inhibitory Activity of Ecklonia cava  

Athukorala Yasantha (Faculty of Applied Marine Science, Cheju National University)
Jeon, You-Jin (Faculty of Applied Marine Science, Cheju National University)
Publication Information
Preventive Nutrition and Food Science / v.10, no.2, 2005 , pp. 134-139 More about this Journal
Abstract
Seven brown algal species (Ecklonia cava, Ishige okamurae, Sargassum fulvellum, Sargassum horneri, Sargassum coreanum, Sargassum thunbergii and Scytosiphon lomentaria) were hydrolyzed using five proteases (Protamex, Kojizyme, Neutrase, Flavourzyme and Alcalase) and screened for angiotensin 1-converting enzyme (ACE) inhibitory activities. Most algal species examined showed good ACE inhibitory activities after the enzymatic hydrolysis. However, E. cava was the most potent ACE inhibitor of the seven species. Flavourzyme digest of E. cava exhibited an $IC_{50}$ of around $0.3\;{\mu}g/mL$ for ACE; captopril has an $IC_{50}$ of $\~0.05\;{\mu}g/mL$. The Flavourzyme digest was separated to three fractions by an ultrafiltration membrane (5, 10, 30 kDa MWCO) system according to the molecular weights. The active components were mainly concentrated in >30 kD fraction which are composed of the highest protein content $(27\%)$ and phenolic content (261 mg/100 mL) compared to the other two smaller molecular weight fractions. Therefore, the active compounds appear to be relatively high molecular weight complex molecules associated with protein (glycoprotein) and polyphenols. Therefore, E. cave is a potential source of antihypertensive compound.
Keywords
brown algae; Ecklonia cava; ACE inhibition; enzymatic hydrolysis; Flavourzyme;
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