Properties of Brown Pigment from Chestnut Shell of Xiuyan Area

The natural brown pigment was extracted from chestnut shells produced in Xiuyan area by ultrasound-method.The light stability,heat stability and p H stability were studied.The antioxidant activities in vitro of brown pigment was investigated by phenanthroline-Fe2+and pyrogallol autoxidation method.The results showed that brown pigment was good at light,heat and p H resistance.In the setting concentration range,the antioxidant activities of brown pigment increased with the elevation of concentration and were lower than that of VC.The clearance rates of hydroxyl free radical and superoxide anion of 2.0 mg·m L-1brown pigment were 55.9% and65.2%.