期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
用海藻酸钙包埋法固定化蓝色梨头霉菌生产氢化可的松的初步研究 被引量:2
1
作者 范志华 孙爱友 +1 位作者 郝建东 许春英 《天津轻工业学院学报》 2003年第4期1-4,共4页
初步研究了海藻酸钙包埋法固定化技术在氢化可的松生产中的应用。确定了底物R.S.A的最佳投料时间为32h、最适的固定化梨头霉菌孢子液浓度为5×106个/mL,选择洗衣粉作为表面活性剂的最适添加量为0.04%。确定了固定化霉菌培养基的最... 初步研究了海藻酸钙包埋法固定化技术在氢化可的松生产中的应用。确定了底物R.S.A的最佳投料时间为32h、最适的固定化梨头霉菌孢子液浓度为5×106个/mL,选择洗衣粉作为表面活性剂的最适添加量为0.04%。确定了固定化霉菌培养基的最优组成。结果表明,固定化的梨头霉菌重复使用5次以后,其羟基化酶的转化能力没有明显下降。 展开更多
关键词 海藻酸钙包埋法固定化技术 氢化可的松 梨头霉菌 培养基 药物 转化率 底物投料浓度
下载PDF
单宁酶的固定化及其性质的研究 被引量:12
2
作者 刘如石 谢达平 +2 位作者 王革生 邱义兰 王征 《湖南农业大学学报(自然科学版)》 CAS CSCD 2000年第5期386-388,共3页
采用海藻酸钙凝胶对单宁酶进行固定化 ,酶活力回收率高达 6 0 .6 % .对固定化单宁酶性质研究结果表明 ,以没食子酸丙酯为底物时 ,固定化单宁酶酶促反应的最适 p H为 6 .0 ,最适温度为 5 0℃ .在 p H5 .0 ,5 0℃ ,保温 1h或 p H6 .0 ,2 ... 采用海藻酸钙凝胶对单宁酶进行固定化 ,酶活力回收率高达 6 0 .6 % .对固定化单宁酶性质研究结果表明 ,以没食子酸丙酯为底物时 ,固定化单宁酶酶促反应的最适 p H为 6 .0 ,最适温度为 5 0℃ .在 p H5 .0 ,5 0℃ ,保温 1h或 p H6 .0 ,2 5℃时 1个月内保持稳定 ,或 p H4.0~ 7.0 ,2 5℃保温 6 h仍有 10 0 %的酶活 .固定化单宁酶处理没食子酸丙酯 2 0 m in,经 18个循环后 ,酶仍不失活 。 展开更多
关键词 单宁醇 固定化单宁醇 性质 海藻酸钙包埋
下载PDF
Synthesis of phosphate-embedded calcium alginate beads for Pb(Ⅱ) and Cd(Ⅱ) sorption and immobilization in aqueous solutions 被引量:8
3
作者 Yun-yan WANG Wen-bin YAO +3 位作者 Qing-wei WANG Zhi-hui YANG Li-fen LIANG Li-yuan CHAI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第8期2230-2237,共8页
The phosphate-embedded calcium alginate beads were successfully synthesized based on sodium alginate, calcium dihydrogen phosphate and sodium hydrogen carbonate. Scanning electron microscopy, Fourier transformed infra... The phosphate-embedded calcium alginate beads were successfully synthesized based on sodium alginate, calcium dihydrogen phosphate and sodium hydrogen carbonate. Scanning electron microscopy, Fourier transformed infrared (FTIR) spectroscopy and X-ray diffraction (XRD) were conducted to characterize the morphology and structure of the phosphate-embedded calcium alginate beads. The effects of pH and the initial concentration of the metal ions on Pb(II) and Cd(II) sorption by the beads were investigated. The optimal pH values for Pb(II) and Cd(II) sorption are 4.0 and 5.5, respectively. The optimal initial concentrations of Pb(II) and Cd(II) are 200 mg/L and 25 mg/L, correspondingly, and the removal efficiencies are 94.2% and 80%,respectively. The sorption mechanism is that the heavy metal ions accessed the beads firstly due to the large surface area, combinedwith OH?, and then precipitated with phosphate radical, which was proven by FTIR and XRD. The sorption of Pb(II) and Cd(II) isfitted to Langmuir isotherm model with R2 values of 0.9957 and 0.988, respectively. The sorption capacities of Pb(II) and Cd(II) are263.16 mg/g and 82.64 mg/g, respectively. The results indicate that the phosphate-embedded calcium alginate beads could be appliedto treating Pb(II)/Cd(II)-containing wastewater and it could be implied that the synthesized beads also could be used as a kind of soil ameliorant for remediation of the heavy metal contaminated paddy soil. 展开更多
关键词 adsorption IMMOBILIZATION lead CADMIUM phosphate-embedded calcium alginate beads
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部