Abstract: In order to study the antioxidant properties of chestnut Astragalus drinks prepared from different raw materials, chestnut and Astragalus as raw materials, drinks were prepared through pulp, enzylysis, deployment, boiling pulp and sterilization to determine and compare the active ingredients and antioxidant ability among them. The results showed that the crude polysaccharide content of Tsuchestnut Astragalus was（163.43±0.5）mg/mL, total flavonoids content was（23±0.02）mg/100mL, total saponin（7.89±0.05）mg/mL; the crude polysaccharide content of Mengshan chestnut Astragalus beverage was（152.05±0.65）mg/mL, total flavonoids content was（36±0.02）mg/100mL, total saponin（9.67±0.06）mg/mL; both kinds of chestnut Astragalus drinks had strong antioxidant ability, total antioxidant resistance of two dilution were both above 0.18, reduction force above 0.2 and DPPH radical clearance above 40%, hydroxy free radical clearance capacity over 50% and O^2-clearance capacity above 38%. DPPH radical clearance rate, hydroxy free radical clearance ability and O^2-clearance capacity of the chestnut Astragalus beverage with Tsuchestnut were higher than that with Mengshan chestnut, but the total antioxidant capacity and reduction forces were on the contrary. Different contents of crude polysaccharide, total saponin and total flavonoids caused different antioxidant properties of the two drinks.

Key words: Chinese chestnut, Astragalus, beverage, antioxidant