设为首页 联系我们 加入收藏

当前位置: 网站首页 期刊分类目录 2012第2期 正文

聚乙二醇修饰纤维素酶的性能研究

作者:时间:2014-06-24点击数:

全文下载:2012020131

谢娟, 李露*, 苏忠亮, 于世涛

(青岛科技大学 化工学院,山东 青岛 266042)

 摘要: 以单甲氧基聚乙二醇丙醛(mPEG-ALD 5KD)为修饰剂,对纤维素酶进行化学修饰,得到修饰纤维素酶(mPEG-Cell)。用mPEG-Cell降解微晶纤维素,以所得还原糖量为标准(DNS比色法测定),考察各种因素对其催化性能的影响,确定最佳修饰条件。结果表明:在0.1 mol·L-1 pH=4.8的柠檬酸-柠檬酸钠的缓冲溶液中,纤维素酶质量浓度为5 mg·mL-1 ,m(mPEG-ALD)∶m(酶)=1∶1,35 ℃修饰24 h,所得到的mPEG-Cell具有最佳的催化性能,在50 ℃下降解微晶纤维素,24 h后可得还原糖量达到2.58 mg·mL-1,比同条件下天然酶降解微晶纤维素得到的还原糖量多0.53 mg·mL-1,即多26%。

 关键词: 纤维素酶; 聚乙二醇丙醛; 化学修饰

 中图分类号: Q 556文献标志码: A

 Chemical Modification of Cellulase with Polyethylene Glycol-aldehyde XIE Juan, LI Lu, SU Zhong-liang, YU Shi-tao

 (CollegeofChemical Engineering,QingdaoUniversityof Science and Technology,Qingdao266042,China)

 Abstract:The modified cellulase(mPEG-Cell)was obtained by using polyethylene glycol-aldehyde (mPEG-ALD) as modifier. The mPEG-Cell was used to degrade microcrystalline cellulose and the effects of various factors on its catalytic properties were investigated based on the amount of obtained reducing sugar (by DNS colorimetric analysis). The obtained optimum conditions were using 0.1M citric acid-sodium citrate as buffer (pH=4.8), concentration of cellulase 5 mg·mL-1, m(mPEG-ALD)∶ m(Cellulase)=1∶1, temperature 35 ℃ and time 24 h. The mPEG-Cell obtained under above conditions was used to degrade microcrystalline cellulose at 50 ℃ for 24 h, the amount of reducing sugar could reach 2.58 mg·mL-1, which was 0.53 mg·mL-1(26%) more than that obtained by using natural cellulase.

 Key words: cellulase; polyethylene glycol-aldehyde; chemical modification

 收稿日期:2011-10-17

基金项目:国家自然科学基金项目(31070520);山东省高等学校科技计划项目(J09LG16);华南理工大学制浆造纸工程国家重点实验室项目(200912)。

作者简介:谢娟(1986—),女,硕士研究生.*通信联系人.

Copyright © 2011-2017 青岛科技大学学报 (自然科学版)