Purification of KGM
10 g KGM was washed with 50 mL 50% (V/V) ethanol containing 0.1% sodium azide for three times so as to remove water-soluble impurity. After drying in air, the powder was degreased in 50 mL
mixed solvent of absolute aether/absolute ethanol [2:1(V/V)] at 40 ◦C under stirring condition for 8 h. Afterwards the degreased sample was dissolved in distilled water to be a 0.6% (W/V) hydrosol.The fibrin and other insoluble impurity were removed with overspeed freezing centrifuge at a rate of 16,000 r/min for 20 min. Then the clear solution was gotten rid of, appropriate amount of amylase was added to remove amylum at room temperature till enzymatic hydrolysis was complete. Deproteinization was carried out on the enzymatic hydrolysis liquid with sevag method for five times. The centrifugation process was carried out again and its water phase was obtained. The same volume 95% ethanol (V/V) was added to deposit sample and then washed with absolute ethanol and aether.Finally, the sample was treated by vacuum freeze drying to obtain
white flocculent KGM.