甲醛脱氢酶的纯化,生物工程论文.docx
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1、甲醛脱氢酶的纯化,生物工程论文摘 要 甲醛是一种极具代表性的室内有机污染物,对人体危害极大。甲醛治理措施包括物理措施、化学措施及生物措施。生物措施因安全有效,不会带来再次污染,对长期延迟缓慢释放的甲醛有良好的治理效果等好处,在甲醛治理中存在明显优势。细菌是净化甲醛的主要微生物,对长期延迟缓慢释放的甲醛有良好的治理效果,并且生物手段具有高经济效益、无污染、操作简便等优点,但从霉菌中检测到FADH活性的报道较少。本课题选用经诱变处理后的甲醛抗性菌株-宛氏拟青霉菌,对其进行液体培养,进而得到菌体,依次通过超声波细胞破碎、硫酸铵沉淀、透析及柱层析,纯化得到活性高的FADH。本实验的重点是通过DEAE-
2、Sepharose、Sephadex-G100、CM-Sepharose三个柱层析条件的探寻求索,提高酶活力,便于 后期制成 商品化 产 品投入市场 ,带 来良 好的 经济和 社会 效益。 结 果 表 明 : DEAE-Sepharose层析上样量为64 m L、洗脱流速为1.5 m L/min,Sephadex-G100凝胶过滤层析上样量为5%CV、洗脱流速为0.50 m L/min,CM-Sepharose上样量为3%CV、洗脱流速为0.75 m L/min时,对甲醛脱氢酶的分离纯化效果最佳。 本文关键词语 : 宛氏拟青霉菌 甲醛脱氢酶 蛋白质纯化仪 层析柱条件优化 酶活力测定。 Abst
3、ract Formaldehyde is a representative indoor organic pollutant, which is harmful to human body. At present, three methods are uesed for Formaldehyde treatment. They are the physical method,the chemical method and the biological method, respectively. Because of its safety and efficiency,biological me
4、thod can not produce secondary pollution, and has good control effect onformaldehyde released slowly for a long time, so it has obvious advantages in formaldehydetreatment.Bacteria are the main microorganisms for the purification of formaldehyde, which hasgood control effect on formaldehyde released
5、 slowly for a long time, and has the adavantage ofhigh economic benefit, no pollution and simple operation. However, there are few reports on thedetection of FADH activity from mold.In this study, the formaldehyde-resistant strainPenicillium Wan, which was treated by mutagenesis, was cultured in liq
6、uid, and the bacteriawere purified by ultrasonic cell fragmentation, ammonium sulfate precipitation, dialysis andcolumn chromatography to obtain the highly active FADH.The key point of this experiment is toimprove the enzyme activity by exploring the three column chromatography conditions ofDEAE-sep
7、harose Sephadex-G100 CM-sepharose, so as to make the commercial products intothe market in the later stage, and bring about good economic and social benefits. The resultsshowed that the amount of sample was 64 m L in the fraction DEAE-Sepharose chromatography,the flow rate of elution was 1.0 m L / m
8、in, the amount of sample in Sephadex-G100 gel filtration chromatography was 5%CV, the elution rate was 0.50 m L / min CM-Sepharose was 3%CV, andthe elution flow rate was 0.75 m L/min, the best separation and purification effect offormaldehyde dehydrogenase was obtained. Key words : Paecilomyces vari
9、otii;formaldehyde dehydrogenase;Protein purifier;Chromatography purification condition optimization;Enzyme activity determination。 1、引言 1.1、甲醛简介。 1.1.1、甲醛的来源。 甲醛是一种极具代表性的室内有机污染物,长期存在于室内空间,是室内空气污染中主要污染物之一。室内甲醛的主要来源有两个方面,包括室内污染和室外污染。室外的甲醛污染气体在特定情况下能够进入室内,导致室内空气中含有较高的甲醛含量。室内甲醛则主要来源日化品和室内装修材料。华而不实,室内装修材
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