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Isolation, Characterization, and Antioxidant Activity of Bromophenols of the Marine Red Alga Rhodomela Confervoides

Isolation, Characterization, and Antioxidant Activity of Bromophenols of the Marine Red Alga Rhodomela Confervoides

Ke Li, Xiao-Ming Li, James B Gloer, Bin-Gui Wang

J Agric Food Chem. 2011 Sep 28;59(18):9916-21.

PMID: 21838299

Abstract:

A total of 19 naturally occurring bromophenols, with six new and 13 known structures, were isolated and identified from the methanolic extract of the marine red alga Rhodomela confervoides. The new compounds were identified by spectroscopic methods as 3,4-dibromo-5-((methylsulfonyl)methyl)benzene-1,2-diol (1), 3,4-dibromo-5-((2,3-dihydroxypropoxy)methyl)benzene-1,2-diol (2), 5-(aminomethyl)-3,4-dibromobenzene-1,2-diol (3), 2-(2,3-dibromo-4,5-dihydroxyphenyl)acetic acid (4), 2-methoxy-3-bromo-5-hydroxymethylphenol (5), and (E)-4-(2-bromo-4,5-dihydroxyphenyl)but-3-en-2-one (6). Each compound was evaluated for free radical scavenging activity against DPPH (α,α-diphenyl-β-dipicrylhydrazyl) and ABTS [2,2'-azinobis(3-ethylbenzothiazoline-6-sulfonic acid)diammonium salt] radicals. Most of them exhibited potent activities stronger than or comparable to the positive controls butylated hydroxytoluene (BHT) and ascorbic acid. The results from this study suggest that R. confervoides is an excellent source of natural antioxidants, and inclusion of these antioxidant-rich algal components would likely help prevent the oxidative deterioration of food.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP849062346	2-Bromo-4,5-difluorophenylboronic acid		849062-34-6	Price

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