Abstract:

Modified attapulgite clay as an adsorbent was used to explore the adsorption properties of the total flavonoids from Ginkgo biloba leaves. Four different kinds of modified attapulgite clay were investigated for their adsorption capacities towards the total flavonoids, and chitosan-modified attapulgite clay was found to have the largest adsorption capacity, which was up to 112.70 mg/g. The adsorption properties of the total flavonoids on chitosan-modified attapulgite clay were explored, and the curves showing the respective effects of sample concentration and pH on the adsorption capacity of the total flavonoids on chitosanmodified attapulgite clay and the adsorption isothermal curves and kinetic curves were plotted. The optimal desoprtion solvent for achieving both high desorption rate (91%) and total flavonoid purity (56%) was composed of 70% ethanol and 1% acetic acid.

Key words: modified attapulgite clay, total flavonoids from Ginkgo biloba leaves, adsorption properties