以油茶籽饼为原料,优化脂肪酶-蜗牛酶提取茶籽多糖的条件,探讨酶提茶籽多糖的抗氧化作用。通过单因素试验和正交试验分析酶解温度和p H、酶解时间、酶添加量、脂肪酶和蜗牛酶质量比对茶籽多糖得率的影响;测定和比较酶提茶籽多糖与水提茶籽多糖对O2-·、DPPH·、·OH、ABTS^(+)·4种自由基的清除率;采用Schaal烘箱法研究酶提茶籽多糖对油脂的抗氧化作用。结果表明:脂肪酶-蜗牛酶提取茶籽多糖的最佳工艺条件为酶解温度35℃、p H 7.0、酶解时间2.5 h、酶添加量2.0%、脂肪酶和蜗牛酶质量比2∶3,在此条件下茶籽多糖得率可达5.83%;酶提茶籽多糖的抗氧化作用强于水提茶籽多糖。酶提茶籽多糖具有作为油脂抗氧化剂的潜质。
The rare ginsenoside Compound K （C-K） is attracting more attention because of its good physiological activity and urgent need. There are many pathways to obtain ginsenoside C-K, including chemical and biological methods. Among these, the conversion of PPD-type ginsenosides by enzymatic hydrolysis is a trend due to its high efficiency and mild conditions. For effectively extracting from the other panaxadiol saponins, the conversion process for ginsenoside C-K was investigated using snailases in this study. The univariate experimental design and response surface methodology were used to determine the optimal hydrolysis conditions for the conversion of ginsenoside Rbl into ginsenoside C-K by snailases. The optimum conditions were as follows： pH 5,12, temperature 51 ℃, ratio of snailase/substrate 0.21, and reaction time 48 h. On the basis of these parameters, the addition of 1.0 mmol· L- 1 ferric ion was found to significantly improve the enzymolysis ofsnailases for the first time. With the above conditions, the maximum conversion rate reached 89.7%, suggesting that the process can obviously increase the yield of ginsenoside C-K. The bioassay tests indicated that the ginsenoside C-K showed anti-tumor activity in a series of tumor cell lines. Based on these results, we can conclude that the process of rare ginsenoside C- K production by enzymolysis with snailase is feasible, efficient, and suitable for the industrial production and application.
Zhiguang DuanChenhui ZhuJingjing ShiDaidi FanJianjun DengRongzhan FuRong HuangCuiying Fan
