Abstract: To fully understand nutritional value,different parts (fruits,branches,leaves,seeds) of Yushu Hippophae (YH) in five different regions were selected to analysis the nutrient composition and nutritional quality evaluation,it give important evidence for the development and utilization of reprocessed products.The crude fat and flavonoids components were extracted with sub-critical fluid n-butane and 1,1,1,2-tetrafluoroethane (R134a),respectively.An accelerated solvent extraction (ASE) method was developed for extraction of sugar.Then,the contents of fat,flavonoids components,total sugars,polysaccharides,carotenoids,total acid,vitamin C and oligomeric proantho cyanidins in YH different parts,the content of fatty acids in YH seed were detected respectively.The contents of routine nutrients,amino acid and various mineral elements in YH different parts were also detected.The results indicated that YH fruits were good sources of amino acids (dry weight,6.89%),soluble sugar (7.56%),carotenoids (34.1 mg/100 g),Vitamin C (1430 mg/100 g) and total mineral elements (226.4 mg/100 g),YH leaves were good sources of protein (17.5%),total flavonoids (2.10%),amino acids (dry weight,15.41%) and total mineral elements (748.1 mg/100 g),YH branches were rich in protein (13.5%),crude fiber (21.1%),ursolic acid (144.1 mg/100 g),amino acids (dry weight,11.62%) and total mineral elements (376.9 mg/100 g),YH seeds were rich in protein (21.4%),Oligomeric proantho cyanidins (3.27%),amino acids (dry weight,18.63%) and unsaturated fatty acid (548.6 mg/g).These figures indicate that YH have good nutrients and practical applications,which to justify security controls.

Key words: Yushu Hippophae, different parts, routine nutrients, amino acids, various mineral elements, nutritional quality evaluation