Antioxidant and antimicrobial characteristics of red and brown algae extracts
Abstract: Red algae (Asparagopsis taxiformis) and brown algae (Sargassum vulgare) are belonging to the Seaweeds. Both algae are traditionally consumed in the Eastern Countries as a part of daily diet. Human consumption of red algae represent 33%, while brown algae represent 66.5% mainly in Japan, China and Korea. However, demand for seaweed as food has now also extended to North America, South America and Europe. The seaweeds are known also to contain bioactive products that display antimicrobial and antioxidant properties. In this study, different solvents, hexane, chloroform, ethanol and methanol have been used to obtain extracts from both algae under investigation. All the extracts were evaluated for antimicrobial activity by disc diffusion method. Best results were shown by hexane extracts of both algae against gram-negative and positive strains such as Escherichia coli, Pseudomonas aeruginosa, Escherichia coli O157:H7, Bacillus cereus, Staphylococcus aureus, Salmonella typhimurium. Water extraction solution was prepared from the two algae and the phenolic content and their antioxidant properties were studied. The phenolic compounds were found to be 9 and 13 mg catechin equivalent/g dry sample for A. taxiformis, and S. vulgare respectively,. Biological evaluation was also carried out by using male rats (185-195g) to examine the antioxidant activity of the water extracts by using stomach tube. Nine groups of rats each containing 6 rats were fed with different tested diets for 10 weeks. G1 fed with basal diet, G2 fed with high fat diet containing 1% cholesterol. G3, G4 and G5 fed with (high fat diet) HFD+chol, and water extraction from Asparagopsis daily containing 1, 1.5, 2 mg polyphenol/200g rat/day respectively. G6, G7andG8 fed with HFD+chol and water extraction from Sargassum containing 1, 1.5, 2 mg polyphenol/200g rat/day respectively. G9 fed with HFD+chol and had a BHT 4mg/200 g/day. Serum cholesterol for G6, G7 and G8 had the lowest concentration of total cholesterol. LDL concentration in rat serum reflected the effectiveness of water extract from Sargassum as antioxidant specially G8 which lowered LDL. The natural antioxidant polyphenols from both algae were affected as positive action for reducing the activity of AST or ALT. Meanwhile, synthetic antioxidant showed negative action for these enzymes.
Publication year 2009
Organization Name
City cairo
serial title Egyptian jornalist of biotechnology
Author(s) from ARC
External authors (outside ARC)
    مني محمد عبد المجيد * قسم الصناعات الغذائية ، كلية الزراعة ، جامعة القاهرة ، الجيزة ، مصر
    ، نادية عبد الرحمن سلامة * قسم الصناعات الغذائية ، كلية الزراعة ، جامعة القاهرة ، الجيزة ، مصر
Publication Type Journal
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