南瓜提取物对糖尿病大鼠降糖效果研究

STUDY ON THE HYPOGLYCEMIC ACTION OF PUMPKIN EXTRACT IN DIABETIC RAT

目的 : 研究南瓜多糖 (A)、南瓜种子发芽后分子量大于 60 ku的蛋白组分 (B)、分子量 3～ 60 ku的蛋白组分 (C)、分子量小于 3 ku的蛋白组分 (D)、精氨酸 (E)和南瓜籽油 (F)对糖尿病大鼠的降血糖作用。方法 : 雄性大鼠 1 60只 ,随机抽取 1 0只作空白对照 ,余下 1 5 0只 ,禁食后于次日晨腹腔注射四氧嘧啶 1 70 mg/kg,72 h后禁食 ,眼眶取血 ,测定血糖值。取血糖值在 7.2 8mmol/L以上者随机分层分组 ,共 1 5组 :模型组、A大小剂量组 (1 0 0 0、5 0 0 mg/kg)、B大小剂量组(3 0 0、1 5 0 mg/kg)、C大小剂量组 (3 0 0、1 5 0 mg/kg)、D大小剂量组 (3 0 0、 1 5 0 mg/kg)、E大小剂量组 (1 0 0、5 0 mg/kg)、F大小剂量组 (3 0 0、1 5 0 mg/kg)、优降糖 (2 0 mg/kg)。连续灌胃给药 1 0 d后 ,禁食 ,次日晨眼眶取血 ,测定血糖及胰岛素含量。随后灌胃给予葡萄糖 2 .5 g/kg,并测定糖耐量值。结果 : 南瓜多糖、分子量大于 60 ku和分子量小于 3 ku的蛋白组分 ,可以显著提高糖尿病大鼠胰岛素水平 ;南瓜籽油、3～ 60 ku的蛋白质组分和精氨酸可以改善糖尿病大鼠的糖耐量。结论 : 3～ 60 ku的蛋白质组分的降血糖效果最佳 ,不但可以显著降低糖尿病大鼠空腹血糖值 。

Objective: To study the hypoglycemic action in diabetic rats by soluble polysaccharides (A), protein components with molecular weights above 60 ku (B),3-60 ku(C) ,and below 3 ku(D) of some pumpkin seeds,arginine(E)and pumpkin seed oil(F). Methods: Ten rats were selected randomly as control ,while the other 150 rats were injected with alloxan 170 mg/kg to induce diabetes.The diabetic rats were divided into 15 groups:the model,A(1000,500 mg/kg),B(300,150 mg/kg),C(300,150 mg/kg),D(300,150 mg/kg),E(100,50 mg/kg),F(300,150 mg/kg),Gilbenclamide(20 mg/kg).The above components were given intragastrically for 10 d and then blood samples were taken to determine serum glucose and insulin, and also to test the glucose tolerance. Results: It was indicated in diabetic rat that the blood insulin level was obviously increased by the soluble polysaccharides , the protein components with molecular weight over 60 ku and below 3 ku after 4 d germination. The blood glucose tolerance was improved by seed oil, protein components with molecular weights 3-60 ku and arginine. Conclusion: The protein components with molecular weights about 3-60 ku have the best hypoglycemic action, in terms of improving the blood glucose tolerance and decreasing the blood glucose level of diabetic rats.