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可降解木质纤维素的双菌共生菌丝球的制备

2018-11-24国巍燕红裴蕾

哈尔滨理工大学学报 2018年4期

国巍 燕红 裴蕾

摘 要:以共固定化菌丝球的产酶能力作为指标,将木质素降解菌G13和纤维素降解菌X1012进行共固定,探讨了X1012的接入时间、接种量、pH值、摇床的转速和温度对菌丝成球和产木质纤维素酶的影响。结果表明,当G13与X1012同时接入、纤维素降解菌的接种量为20mL(100mL培养基),培养基的pH值为5、摇床转速为160r/min、温度为28℃时,锰过氧化物酶、漆酶、木质素过氧化物酶、纤维素酶和半纤维素酶的酶活达到最高,分别为31.246U/L、16.048U/L、157.528U/L、197.063U/L和215.81U/L。X1012与G13在共固定过程中,具有互补的性能,在产酶的过程中发挥了协同的作用,促进了木质素降解酶的分泌。所获得的双菌共生菌丝球的球体为白色,表面光滑,大小均匀,具有一定的机械强度,能够满足实践应用的需求。

关键词:菌丝球;木质素降解菌;纤维素降解菌;木质素酶;纤维素酶

DOI:10.15938/j.jhust.2018.04.024

中图分类号: Q939.9

文献标志码: A

文章编号: 1007-2683(2018)04-0127-06

Abstract:In our research, enzyme production ability of immobilization mycelial pellet was used as an index, the immobilization mycelial pellet was immobilized with lignindegrading fungus G13 and cellulosedegrading bacteria X1012. The influence of five factors (addition time, inoculation amount of cellulosedegrading bacteria, pH, temperature and rotational speed) to Mycelium pellet, ligninase production and cellulase production were studied. The results indicated that X1012 and G13 were added simultaneously and the inoculation amount was 20%, pH was 5, culture temperature was 28℃, rotational speed was 160 r/min, the manganese(MnP); laccase(Lac); lignin peroxidase(Lip); cellulose; hemicellulose were 31.246U/L;16.048U/L;157.528U/L;197.063U/L;215.81U/L, respectively. X1012 and G13 have the complementary advantage on the immobilization process, develope the synergy effects and promote the production of ligninase. The immobilization mycelial pellet was white, smooth surface, uniform size and good elasticity, which can satisfy practical needs.

Keywords:mycelia pellets;lignindegrading fungus; cellulosedegrading bacteria; ligninase; cellulase

0 引 言

制漿造纸工业每年要从植物中分离出大约14亿t纤维素[1],同时产生含有5000万t左右木质素的污水[2,3]。木质素的结构复杂,降解困难,近年来固定化微生物技术降解木质素在制浆造纸工业废水处理上有了越来越多的应用[4-6]。固定化微生物技术具有微生物密度高,反应迅速,微生物不易流失,产物易分离等优点,是一种低耗能高效率的新技术。菌丝球是由菌丝相互缠绕而成的球体,菌丝球具有生存能力强、沉降速度快、易于固液分离、可重复利用、多孔表面积大的特点[7]。目前国内外主要着重研究单一菌株菌丝球的成球机理[8-14],而造纸废水是一个非常复杂的混合体系,单一菌株很难达到既净化水质又降解多种废弃物的目的。……

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