STUDY ON THE NUTRITIONAL COMPONENTS OF RASPBERRY FRUITS AND THEIR EFFECTS ON ANTIOXIDANT ACTIVITY

Objective To analyze the nutrients contents of Xinjiang wild raspberry fruits and evaluate the antioxidant capacity. Method The nutritional components were analyzed with GB(national standards methods) and other related methods. Red raspberry fruit was extracted with 95% ethanol,defatted with petroleum ether,then partitioned with EtOAc and BuOH successively. Antioxidant activity of the extracts was evaluated with DPPH· and ·OH scavenging assay. Results Red raspberry fruit contained 17 kinds of amino acids,among which essential amino acids were up to 320 mg%,and glutamate(180%) was the highest in non-essential amino acids. Besides,raspberry fruit was rich in carbohydrates(10.62%) ,organic acid( 1.72%,mainly citric acid) ,vitamin C(28.04 mg%) ,potassium(147.32 mg%) and zinc(3.8mg%) . The content of total phenolics,total flavonoids,ellagic acid and tannin was 498%,125 mg%,2.2 mg% and 290 mg% respectivily. SOD activity reached 606.93U/ml. Compared with gallic acid and ascorbic acid,the crude extract and different soluble fractions of raspberry fruit showed good antioxidant activity,among which ethyl acetate fraction exhibited the highest activity,especially in ·OH scavenging activity. Conclusion Xinjiang wild raspberry fruits contain various nutritional components and have high antioxidant activity,showing good prospect for development and utilization.