利用相转移催化技术制备中间产物京尼平及栀子蓝色素反萃制备毕业论文
2022-06-26 23:19:35
论文总字数:20641字
摘 要
本实验以栀子苷为底物,β-葡萄糖苷酶为催化剂,从10种有机溶剂中选择酶能稳定存在的水-有机体系,测定了β-葡萄糖苷酶稳定性以及栀子苷在正辛醇-水和正己醇-水体系中的分配系数,分别在水、正辛醇-水和正己醇-水体系中进行栀子苷水解制备京尼平的反应,并研究栀子蓝色素反萃制备的条件。
研究结果表明:β-葡萄糖苷酶在正辛醇-水和正己醇-水体系中能够更好地保持酶活(均为88.2%左右),且热稳定性较好,确定了制备京尼平的体系为正辛醇-水体系,反应温度为55℃;栀子蓝反萃制备实验中,甘氨酸和精氨酸最佳pH分别为5.0和9.0。
关键词:栀子苷 京尼平 β-葡萄糖苷酶 相转移催化 反萃
Improving the Genipin preparation with Phase Transfer Catalysis and Gardenia Blue Pigment prepared with stripping preparation
Abstract
In this experiment, we use gardenoside as substrate and β-glucosidase enzyme as catalyst, Selecting 10 kinds of organic solvents to formulate water - organic system, and determined the stability of β-glucosidase in the two-phase system respectively. The partition coefficients of gardenoside in the systems of octanol-water and hexanol-water were probed. In addition, the preparation of genipin was carried out in the system of water, octanol-water and hexanol-water respectively. We also studied the conditions of stripping preparation to get gardenia blue pigment.
The result has showed that the β-glucosidase enzyme is more active in octanol-water and hexanol-water systems (for about 88.2%) and has better thermo stability. Therefore, the reaction of preparing genipin is performed in octanol-water system, and the temperature was 55℃. In the stripping preparation of gardenia blue pigment, the optimal pH of glycine and arginine were 5 and 9 respectively.
Key Words: Gardenoside; Genipin; β-glucosidase enzyme; Phase Transfer Catalysis; Stripping
目 录
摘 要 I
Abstract II
前 言 1
第一章 文献综述 2
1.1 栀子蓝色素 2
1.2 京尼平 3
1.3 京尼平的制备方法 3
1.3.1直接提取法 3
1.3.2 生物发酵法 3
1.4 相转移催化技术 4
1.5 研究的目的和意义 5
第二章 实验材料与方法 6
2.1 主要实验试剂 6
2.2 主要实验设备 7
2.3 HPLC分析条件的确定 7
2.4 京尼平标准曲线的绘制 7
2.5 栀子苷标准曲线的绘制 8
2.6 相转移催化生物制备京尼平 8
2.6.1 β-葡萄糖苷酶酶活测定方法 8
2.6.2 京尼平对栀子苷水解反应的影响 9
2.6.3 有机相-水相体系的选择 9
2.6.4 两相体系中β-葡萄糖苷酶催化制备京尼平 9
2.6.5 底物浓度对京尼平得率的影响 10
第三章 实验结果与讨论 12
3.1 京尼平和栀子苷检测波长的确定 12
3.2 京尼平标准曲线 12
3.3 栀子苷标准曲线 14
3.4 β-葡萄糖苷酶酶活测定 15
3.4.1 pNP标准曲线绘制 15
3.5 京尼平对栀子苷水解反应的影响 16
3.6 有机相-水相体系的选择 17
3.7 两相体系中β-葡萄糖苷酶催化制备京尼平 19
3.8 底物浓度对相转移催化的影响 22
3.9 栀子蓝色素的反萃制备 23
3.9.1 栀子蓝反萃pH的选择 23
3.9.2 栀子蓝反萃底物浓度的选择 24
3.9.3 栀子蓝反萃温度优化 25
第四章 结论与展望 26
4.1 结论 26
4.2 展望 26
参考文献 27
致 谢 29
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