The author summarized the physiological activity of carrageenan,——antioxidant, antiviral and anti coagulation.The article compared and analysed three methods of decomposing carrageenan to carrageenan oligosaccharides.And it emphatically pointed out that biological enzyme method is better than chemical method and physical method on degradation of carrageenan and its good application prospect.?In addition,the article clarified the possibility of obtaining new carrageenase from Polar microorganisms from the special biological environment,the microorganisms' special physical and chemical characteristics and so on.In order to provide reference for the search of the industrial production of carrageenan oligosaccharides by enzymatic degradation.
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