Production of laccase by Coriolus versicolor and its application in decolorization of dyestuffs : (Ⅰ) Production of laccase by batch and repeated-batch processes

The production of laccase by Coriolus versicolor was studied.The effect of cultivation on laccase production by Coriolus versicolor was examined to obtain optimal medium and cultivation conditions.Both batch and repeated-batch processes were performed for laccase production.In repeated-batch fermentation with self-immobilized mycelia, total of 14 cycles were performed with laccase activity in the range between 3.4 and 14.8U/ml.     

Production of laccase by Coriolus versicolor and its application in decolorization of dyestuffs: (Ⅱ) Decolorization of dyes by laccase containing fermentation broth with or without self-immobilized mycelia

ＩｎｔｒｏｄｕｃｔｉｏｎＷａｓｔｅｗａｔｅｒｆｒｏｍｔｅｘｔｉｌｅｐｒｉｎｔｉｎｇａｎｄｄｙｅｉｎｇｉｎｄｕｓｔｒｙｉｓｏｎｅｏｆｔｈｅｍａｉｎｐｏｌｌｕｔｉｏｎｓｏｕｒｃｅｓｉｎＥａｓｔｅｒｎＣｈｉｎａ,ｗｈｅｒｅｔｈｅｃｏｕｎｔｒｙ’ｓｍｏｓｔｔｅｘｔｉｌｅｉｎｄｕｓｔｒｙａｒｅｓｔａｔｉｏｎｅｄ .Ｔｈｏｕｓａｎｄｓｋｉｎｄｓｏｆｄｙｅｓｗｉｔｈｄｉｆｆｅｒｅｎｔｓｔｒｕｃｔｕｒｅｓａｒｅｂｅｉｎｇｃｏｎｓｕｍｅｄａｎｄｌａｒｇｅａｍｏｕｎｔｏｆｃｏｌｏｒｆｕｌｗａｓｔｅｗａｔｅｒｃｏｎｔａ…     

Production of laccase by Coriolus versicolor and its application in decolorization of dyestuffs: (Ⅰ) Production of laccase by batch and repeated-batch processes

ＩｎｔｒｏｄｕｃｔｉｏｎＮｏｎ ｓｐｅｃｉｆｉｃｏｘｉｄａｔｉｏｎｏｆｐｏｌｙａｒｏｍａｔｉｃｃｏｍｐｏｕｎｄｓｂｙｌｉｇｎｉｎｏｌｙｔｉｃｅｎｚｙｍｅｓｆｒｏｍｌｉｇｎｉｎ ｄｅｇｒａｄｉｎｇｗｈｉｔｅ ｒｏｔｆｕｎｇｉｈａｓｉｎｃｒｅａｓｉｎｇｌｙａｔｔｒａｃｔｅｄａｔｔｅｎｔｉｏｎｓｂｅｃａｕｓｅｏｆｉｔｓａｂｉｌｉｔｙｔｏｍｅｔａｂｏｌｉｚｅａｗｉｄｅｒａｎｇｅｏｆｏｒｇａｎｉｃｃｏｎｔａｍｉｎａｎｔｓ(Ｋａｃｓｔｎｅｒ,2 0 0 0 ) .Ａｍｏｎｇｔｈｅｍ ,ｌａｃｃａｓｅ ,ａｌｓｏｃａｌｌｅｄｐｈ…     

Trametes sp.LS-10C产漆酶发酵培养基优化及其漆酶对偶氮染料的脱色性能

为了提高菌株Trametes sp.LS-10C的漆酶产量并初步研究该酶对偶氮染料的脱色性能,本文通过单因素实验及均匀设计对菌株Trametes sp.LS-10C产漆酶培养基进行了优化,获得最优培养基配方为:葡萄糖14.4 g·L~(-1)、豆渣10.1 g·L~(-1)、麸皮100 g·L~(-1)、NH_4Cl_3g·L~(-1)、KH2PO41.4g·L~(-1)、CuSO_4’5H2O 1 g·L~(-1)、NaCl 1 g·L~(-1)、MgSO_40.8 g·L~(-1)、CaCl_20.5 g·L~(-1).菌株发酵至8 d时漆酶产量为595.15 U·m L~(-1),约是优化前的35.66倍.进一步研究表明,该漆酶-介体系统对酸性红GR、酸性蓝40和酸性铬蓝K等3种偶氮染料脱色10 h后脱色率分别高达96.86%、91.28%和86.31%.相比公开发表的文献,本研究所报道的Trametes sp.LS-10C利用优化培养基发酵产漆酶达到了较高水平,具有酶活力高和发酵时间短等特征,且该漆酶在处理偶氮染料废水脱色领域中具有进一步研发和应用价值.     

Decolorization of reactive dyes by laccase immobilized in alginate/gelatin blent with PEG

To achieve effective decolorization of reactive dyes,laccase immobilization was investigated.Laccase 0.2%(m/V)(Denilite IIS) was trapped in beads of alginate/gelatin blent with polyethylene glycol(PEG),and then the supporters were activated by cross-linking with glutaraldehyde.The results of repeated batch decolorization showed that gelatin and appropriate concentration of glutaraldehyde accelerated the decolorization of Reactive Red B-3BF(RRB);PEG had a positive effect on enzyme stability and led to an inc...     

Myrothecium verrucaria NF-08产漆酶条件的响应面法优化及粗酶染料脱色研究

以半知菌属疣孢漆斑菌Myrothecium verrucaria NF-08为供试菌,采用响应面方法优化菌株产漆酶条件,并以其漆酶粗酶进行3种结构类型6种染料的脱色试验,考察了粗酶浓度、温度和p H值对脱色率的影响.两水平析因设计、中心组合设计和验证试验结果表明:葡萄糖浓度为15.4 g·L~(-1)、蛋白胨浓度为43.3 g·L~(-1)和培养基初始p H值为6.68时,漆酶活性达到最大值(25.58±1.60)U·m L~(-1),是单因素试验(16.82 U·m L~(-1))的1.52倍,提高了52.1%.以上述发酵条件获得的M.verrucaria NF-08漆酶粗酶对3种结构类型染料均有脱色效果,排序为偶氮类优于芳甲烷类优于蒽醌类.脱色率随粗酶浓度增大(2~8 U·m L~(-1))、反应温度升高(15~35℃)而上升,随p H值上升(4~10)而下降.粗酶浓度为5 U·m L~(-1),反应温度为25℃,p H值为4时,偶氮类染料铬黑T和芳甲烷类染料碱性品红即可几乎完全脱色,脱色率分别为99.2%和94.6%.     

Aureobasidium pullulans UVMU3-1产耐热性胞外漆酶活性物质培养基优化及其对染料脱色作用

对出芽短梗霉无色素突变株Aureobasidium pullulans UVMU3-1产耐热性胞外漆酶活性物质培养基进行优化,并研究其分子量大小、热稳定性及对三苯甲烷类染料孔雀石绿和结晶紫的脱色作用.结果表明:蔗糖、NaNO_3为UVMU3-1产耐热性胞外漆酶活性物质的最佳碳源和氮源,产酶优化培养基配方为:蔗糖66.5 g·L~(-1),NaNO_338.4 g·L~(-1),NaCl 1.08 g·L~(-1),酵母浸粉0.2 g·L~(-1),KH_2PO_41 g·L~(-1),pH=6.0.影响UVMU3-1产耐热性胞外漆酶活性物质的因素依次为:起始pH蔗糖NaClNaNO_3,培养7 d时产生最大酶活(94.81 U·L~(-1)),比对照提高3.85倍.其分子量小于1000 D,具有良好的热稳定性,煮沸30 min后高温酶活仍残留72.50%.粗酶液(7.5 U·L~(-1))与三苯甲烷类代表性染料孔雀石绿和结晶紫75℃反应5 min后,脱色率分别为76.3%、77.5%,反应35 min后脱色率分别达到96.3%、95.3%.