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Anti-oxidation of agar oligosaccharides produced by agarase from a marine bacterium

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Abstract

In order to prepare the active agar oligosaccharide, agarase extracted from a strain of unidentified marine bacterium from the South China Sea coast was selected for the agar depolymerization. The optimum decomposing conditions were determined to be pH 7.0, 35 °C and halophilic properties 2%. Three main degraded products, AOS-1, AOS-2 and AOS-3, were separated by ethanol fractionation and anion exchange chromatography. The molecular mass was analyzed by MALDI-TOF-MS. The agar oligosaccharides exhibited antioxidative activities in scavenging hydroxyl free radical, scavenging superoxide anion radical and inhibiting lipid peroxidation. The fragment with the sulfate group showed stronger antioxidative activities than that without the sulfate group. Higher antioxidative activities were found when the molecular mass was increased. The results indicated that the antioxidative activities were closely related to the molecular mass of the agar oligosaccharides and the substitute groups binding the carbohydrate ring.

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Authors and Affiliations

  1. Department of Food Science and Technology, Ocean University of China, No. 5 Yushan Road, Qingdao, 266003, Shandong Province, People's Republic of China.

    Jingxue Wang, Xiaolu Jiang, Haijin Mou & Huashi Guan

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  1. Jingxue Wang
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  2. Xiaolu Jiang
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  3. Haijin Mou
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  4. Huashi Guan
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Wang, J., Jiang, X., Mou, H. et al. Anti-oxidation of agar oligosaccharides produced by agarase from a marine bacterium. Journal of Applied Phycology 16, 333–340 (2004). https://doi.org/10.1023/B:JAPH.0000047944.40463.e6

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  • DOI: https://doi.org/10.1023/B:JAPH.0000047944.40463.e6

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