1.Food Science College, Xizang Agricultural & Animal Husbandry University
2.Key Laboratory of Wildlife Resources Evaluation and Utilization in Xizang
3.The Provincial and Ministerial co-founded collaborative innovation center for R & D in Xizang Characteristic Agricultural and Animal Husbandry Resources, Linzhi, Xizang 86000
Yunnan sea buckthorn is rich in triterpene acids with hypoglycemic activity. In order to establish the extraction and purification process of hypoglycemic active ingredients in Tibetan seabuckthorn, this study used Yunnan seabuckthorn fruit as raw material to obtain triterpenoid acid by ethanol extraction and AB-8 macroporous resin purification. The results showed that the optimum extraction conditions were as follows: liquid-solid ratio 40 mL/g, ethanol concentration 65%, extraction temperature 57℃, extraction time 30 min. The optimum adsorption and desorption conditions of AB-8 macroporous resin were as follows: the sample concentration was 20 mg/mL, the pH was 6, the adsorption flow rate was 2.5 mL/min, and the ethanol concentration was 55%. After purification, the purity increased by 2.49 times. This method proved stable and feasible, and can be used for the extraction and purification of triterpene acids from Yunnan seabuckthorn.
沙棘不仅以其独特的生态适应性和经济价值受到关注,其果实更是因其丰富的营养和功能而备受瞩目。三萜类化合物类化合物是沙棘果中重要的活性成分,其中五环三萜类化合物最为丰富,以游离或苷类形式存在,主要包括熊果酸( UA )、齐墩果酸( OA )、山楂酸( MA )、科罗索酸( CA )和白桦脂酸( BA )等[6,7]。研究表明,UA不仅降低糖尿病小鼠体内血糖、甘油三酯( TG )、游离脂肪酸( FFA )和总胆固醇 ( TC )等生理生化指标,还通过增加糖原合成和葡萄糖吸收,发挥胰岛素促泌剂和模拟剂的作用[8]。Ma[9]等研究表明,UA具有抗CCl4致小鼠肝纤维化的作用,与OA类似,UA通过抑制固醇调节元件结合蛋白-1c ( SREBP-1c )的表达改善大鼠脂肪肝[10];UA降低天门冬氨酸氨基转移酶(AST)、丙氨酸转氨酶(ALT)对肝脏的损伤作用[10],改善液态果糖诱导的大鼠IR[11],链脲佐菌素(STZ)致糖尿病大鼠胰岛素敏感性及糖原合成增加[12],MA促进HepG2细胞糖原合成,抑制糖原磷酸化酶活性,对小鼠酒精性肝损伤有保护作用[12];CA减少T2DM斑马鱼模型糖原降解,增加葡萄糖消耗;BA通过激活AMP活化蛋白激酶( AMPK )磷酸化,抑制SREBP-1c表达可减轻非酒精性脂肪性肝病的发生[13]。
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