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Antioxidative Properties of Brown Algae Polyphenolics and Their Perspectives as Chemopreventive Agents Against Vascular Risk Factors  

Kang, Keejung (Laboratory of Aging and Degenerative Diseases, Hanbat National University)
Park, Yongju (Laboratory of Aging and Degenerative Diseases, Hanbat National University)
Hwang, Hye-Jeong (Laboratory of Aging and Degenerative Diseases, Hanbat National University)
Kim, Seong-Ho (Laboratory of Aging and Degenerative Diseases, Hanbat National University)
Lee, Jeong-Gu (Department of Urology, Korea University, Anam Hospital)
Shin, Hyeon-Cheol (Laboratory of Aging and Degenerative Diseases, Hanbat National University)
Publication Information
Archives of Pharmacal Research / v.26, no.4, 2003 , pp. 286-293 More about this Journal
Abstract
Several polyphenolic compounds and complex mixtures were isolated from brown algae species. The 1,1-diphenyl-2-picryhydarzyl (DPPH) radical scavenging activity and ferric reducing antioxidant power (FRAP) of these compounds were evaluated to determine their physiological usefulness as antioxidants for vascular protection. The antioxidative protection of low-density lipoprotein (LDL) was also evaluated and compared with that of catechin, because the generation of oxidized LDL is one of the most active and specific risk factors contributing to atherogenesis. Oral administration to rats of a commercially available sample ($VNP^{TM}$) containing 30% of these polyphenolic compounds and 70% dietary fiber revealed that the serum reducing capacity measured in terms of FRAP value was significantly elevated 30 min after the treatment, but declined rather quickly thereafter, indicating the good oral absorption of the compounds and their fast binding to the lumenal surface of the blood vessels. An eight-week, human, clinical trial (n=31) of $VNP^{TM}$ showed significant improvement in erectile function measured by IIEF (international index of erectile function) score. These results collectively demonstrated the usefulness of these polyphenolic compounds as fundamental chemopreventive agents against vascular risk factors originating from oxidative stress.
Keywords
Brown algae polyphenolics; Antioxidative; Oxidized LDL; Endothelial; Vascular protection; Erectile function;
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