Abstract:

Hot water extraction technology for crude polysaccharide in pineapple peel and pineapple polysaccharide’s ability to eliminating the activity of hydroxyl radicals were studied. Effects of different factors such as material-liquid ratio, temperature and time on the yield of polysaccharide were studied. Results show that the order of the factors which affect the yield of polysaccharide was like this: temperature > time> material-liquid ratio. The optimal conditions for the water extraction technology were: 100℃ and 3 hours with the material-liquid ratio of 1:20. The yield of polysaccharide reached 5.2% under the optimal condition. Salicylic acid colorimetric was used to research the effect of pineapple polysaccharide to eliminate the hydroxyl radicals. Research show that crude pineapple polysaccharide has the ability to eliminating hydroxyl radicals. The eliminating rate was up to 50% when the concentration of crude pineapple polysaccharide was 19mg ml-1.