Abstract:

Polyamides, D101 macroporous resin, powdered activated carbon and granular activated carbon were separately adopted to decolorize the crude polysaccharide from Ginkgo biloba pollen. Granular activated carbon had the best decolorization efficiency in terms of weighed score for retention rate of polysaccharide and decolorization rate. One-factor-at-a-time method was adopted to investigate the effects of three crucial factors (namely, decolorization duration, temperature and decolorant quantity) on decolorization of the crude polysaccharide. Subsequently, the three factors were optimized using orthogonal array design. The optimal decolorization duration, temperature and decolorant quantity were 50 ℃, 4 h and 0.15 g/ml, respectively. Under these conditions, the decolorization rate was over 72.84% and 88.19% of polysaccharide was recovered.

Key words: Ginkgo biloba pollen, decolorization, granular activated carbon