FOOD SCIENCE ›› 2007, Vol. 28 ›› Issue (12): 82-84.

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Comparison of Deproteinization Methods for Milk Thistle Crude Polysaccharide

 DONG  Ying, ZHANG  Yan-Fang, SUN  Yan-Hui   

  1. School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China
  • Online:2007-12-15 Published:2011-11-22

Abstract: The deproteinization effects of three methods were compared by the percentage of the deproteinization, polysaccharide loss and capacity of polysaccharide solution scavenging DPPH free radical. The results showed that the effective order of these methods is HCl method, then trichloroacetic acid method, and finally Sevag method. As the pH value of polysaccharide solution is 2 as adjusted by HCl, the results are: the percentage of the deproteinization 88.9%, the percentage of losing polysaccharide 14.8% and the capacity of polysaccharide solution scavenging DPPH free radical 45.6%.

Key words: milk thistle crude polysaccharide, deproteinization, DPPH, antioxidative activity