Preparation and Antioxidant Activities of Polysaccharides from Limonium bicolor

It is studied the preparation and the antioxidant capacities of polysaccharides from Limonium bicolor by the ultrasonic-microwave synergistic extraction method.The orthogonal design with water as solvent was carried out to optimize the extraction process.The antioxidant activities were evaluated by the scavenging rate of the hydroxyl free radical(.OH).The optimum technological conditions for extracting polysaccharides from Limonium bicolor were as follows:the ratio of sample to water was 1︰60,the extraction temperature was 70 ℃,the extraction time was 600 s,and the quantity of the polysaccharides was high to 46.45 mg/g.Also,the polysaccharides from Limonium bicolor had the stronger scavenging capacity with the increase of the concentration.Compared with the traditional extraction method by hot water,the ultrasonic-microwave synergistic extraction can shorten the extraction time and enhance the extraction efficiency.The polysaccharides of Limonium bicolor had the obvious antioxidative activity.