本文以去茶多酚茶叶残渣为原料,制备茶叶蛋白质。通过试验优化碱提取条件为:固-液比为1:40,提取时间为40min,提取温度为90℃,碱液浓度为0.06mol/L,在此条件下,茶叶蛋白的提取率为56.4%。所得蛋白提取液经过活性炭脱色,pH4.5沉淀,得到茶叶粗蛋白。脱色前后蛋白提取液的清除羟自由基(HFR)的能力分别为IC_(50)=5.89mg/ml和11.5mg/ml
通过Shodex PROTEIN KW-802.5确定茶叶蛋白的分子量5000~1000,000Da;通过Sephedex G-200凝胶柱和DEAE(FF)离子交换柱对茶叶蛋白进行分离纯化,获得了具有清除HFR能力的茶叶蛋白TP-3-2,其IC50为20.3mg/ml。电泳实验结果表明该蛋白的纯度达到了电泳纯,蛋白分子量28800Da左右。
对添加茶渣进行灵芝发酵的可行性进行了研究,并确定了茶渣的适宜添加量为1.0%,适宜发酵时间为105~110h,多糖含量达到4.46g/L发酵液,氨基酸分析表明其氨基酸组成基本没有发生变化。以上分析表明添加1.0%的茶渣对灵芝生长没有影响。对添加了茶渣的灵芝发酵液...
【英文摘要】
Tea protein(TP) was extracted from depolyphenols tea residues with a mixed solutionsystem which was optimized as: the NaOH concentration 0.06mol/L, the extractiontemperature 90℃, the extraction time 40 min. and tea :water ratio 1:40. Under this conditionthe maximum extracting rate of TP was 56.4%. After the solution was decolored with activecarbon and adjusted to pH4.5 the crude TP was prepared. The trial of HFR clearanceindicated that the IC50 value of raw and decolored TP solution was 5.89mg/ml and 11.5mg...