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固定化黄孢原毛平革菌生产木素过氧化物酶及其对染料脱色降解的研究
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摘要
本文研究了多孔材料—聚氨脂泡沫固定化黄孢原毛平革菌合成木素过氧化物酶的产酶条件。在此基础上,研究了酶系的分离、固定化条件及固定化酶对染料的脱色降解。
     经研究发现:使用聚氨脂泡沫固定黄孢原毛平革菌生产木素过氧化物酶的效果很好。本文研究了五种不同类型的聚氨酯泡沫的固定化效果,经发酵试验证明聚氨脂载体3固定化菌丝的产酶较高,且发酵液澄清,对后处理有利。聚氨脂泡沫价格便宜,是比较好的固定化载体。
     用正交实验法对三种影响产酶较大的因素(载体量、酒石酸铵和转速)进行了优化,得到优化后的培养条件:载体量4g/L,酒石酸铵量2g/L和转速190r/min。优化后木素过氧化物酶活力可达200U/L,通过实验证明接种量对产酶影响不大。
     固定化菌丝重复间歇培养生产木素过氧化物酶的试验表明:重复加入与原始培养基组分相同的培养基、碳源减半或氮源减半的培养基时,均可以较早的产酶。固定化菌丝重复产酶,可以省去菌种的生长阶段,并且重复过程中碳氮源减半也节省了成本。
     用硫酸铵沉淀法对木素过氧化物酶进行了初步分离与纯化,结果表明:45%浓度硫酸铵对沉淀木素过氧化物酶的效果最好,沉淀后酶的回收率最高。用正交实验确立了木素过氧化物酶固定化的最佳条件:海藻酸钠浓度为3%,戊二醛浓度为0.4%,氯化钙浓度为0.2mol/L,在此条件下木素过氧化物能够被很好的固定。固定化后,酶的稳定性增强,对温度和pH的抗性增加。
     以红玉为对象研究了游离酶对其的脱色条件:游离酶脱色低浓度红玉时效果较好,而对高浓度的红玉脱色率较差,在脱色过程中过氧化氢的最适浓度为100μmol/L,最适pH值为4.0,最适温度为35℃。
     在研究固定化酶对红玉脱色时发现:固定化酶对红玉的脱色速率比游离酶要差,并且达到平衡的时间要较长。但是固定化酶可以重复使用7次,在重复使用时发现固定化酶对染料的脱色效率下降,这主要是在脱色过程中有过氧化氢的参与,而过氧化氢对酶液有失活作用,导致在重复使用过程中酶液的不断失活而导致对红玉的脱色效率下降。
In this thesis ,we first study lignin peroxidase production by Phanerochaete chrysosporiun on porous polyurethane foams . On the basis of this , we studied crude separation and purification of lignin peroxidase , immobilization of the lignin peroxidase and the degradation of the dyes by the immobilized lignin peroxidase.
    From our investigation , we found that effection of lignin peroxidase production by the Phanerochaete chrysosporiun immobilized porous polyurethane foams are good . Among the five kind of on porous polyurethane are tested , the third is the most effective in the fermentation experiment.The mycelium immobilized stablely in the foam of the following and fermentation liquor was clear, which is beneficial on the post-treatment, Polyurethane foam is a suitable carrier for its cheap price and effectiveness.
    We optimize three parameters which are the most effective in the lignin peroxidase production through orthogonal method : the amount of the carrier , the amount of ammonium tartrate and the the rotation. The optimal value of the three parameters are 4g/L, 2g/L and 190r/min respectively. Under which the production was increased and the activities of the lignin peroxidase can reach 200U/L Additionally , inoculation amount test show that it influence little in the fermentation.
    Repeated batch fermentation of the immobilized Phanerochaete chrysosporiun indicated that we can get the lignin peroxidase if we adding initial fermentation medium or adding medium which is lower in glucose or ammonium tartrate, We can reused the immobilized mycelium and bypass the incubation period after immobilization. Furthermore , reducing glucose or ammonium tartrate is an economic way in reducing production cost.
    We did some crude separation and purification of the lignin peroxidase.In the research we found that the concentration of 45% ammonium
    
    
    sulfate is the best when precipitation of the lignin peroxidase, the acquirement rate of which is 86% , We optimize three parameters that are the most effective in the activity of immobilized lignin peroxidase production through orthogonal method : The optimal value of the three parameters are 3% sodium alginate, 0.4% glutaraldehyde and 0.2mol/L Calcium Chloridere respectively, under which the spectrums of the optional pH and optional temperature were expand and had a better stability.
    When the four kind of dyes were degraded directively by the enzyme solution. They all had different extents of the degradation . In the test of using immobilized lignin peroxidase degrade dyes , We chose disperse Rubine as the object and investigated the potential of our immobilization system. In the comparison of the decolorization results of the three concentrations of the disperse Rubine we tested , we could conclude that the decolorization rate of the higher concentration are lower than those of the lower concentration..The result indicated that the immobilized lignin peroxidase could be reused at least of 7 times. In the test of the decolorization we found the colorization rate is declined gradully which due to the reducement of the concentration of H2O2.
引文
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