3.1.5 Molecular weight distribution analysis
The average weight molecular weight (Mw) of GP mainly distributed in the range of 10-320 kDa by HPGPC and special GPC software (Fig. 1E). It was revealed that the polysaccharides have four main peaks with molecular weights of 26, 56, 152, and 275 kDa, with distribution percentages of 26.6%, 55%, 13.7%, and 4.8%, respectively. In addition, the average difference in Mw between the peaks was 63 kDa, indicating that GP is a mixture of a series of hetero-polysaccharides.