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短短芽孢杆菌XDH的鉴定及其抗菌物质的分离、纯化与部分性质研究
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摘要
a’311菌株是本实验室从泰山土壤分离获得的一株拮抗细菌。该菌株对多种动、植物病原细菌和真菌如:大肠杆菌、鸡巴氏杆菌、金黄葡萄球菌、黑胸败血病菌、棉花枯萎病菌、黄瓜枯萎病菌、茶轮斑病菌等有较强拮抗作用,该菌株抑菌谱广,菌株发酵性状优异,发酵液性质稳定,显示了诱人的开发前景。本文通过菌体形态特征观察、生理生化指标测定和16S rDNA序列分析,对该菌株进行了鉴定。选择了适合该菌株的发酵条件,并通过硫酸铵沉淀、Sephadex G-50柱层析、高效液相色谱(HPLC)和质谱(MS)分析,对抗菌物质进行了分离纯化,并研究了其部分性质。主要内容如下:
     1通过菌体形态特征观察、生理生化指标测定、16S rDNA序列及其系统进化树分析,鉴定a’311菌株为短短芽孢杆菌(Brevibacillus brevis),命名为短短芽孢杆菌XDH。该菌株的16S rDNA序列已在美国Genbank注册,登录号为DQ279738。
     2筛选到一个适合该菌株的发酵条件。培养基配方:葡萄糖16g,可溶性淀粉2.5g,蛋白胨10g,黄豆饼粉26g,玉米浆1.0g,NaCl7.5g,(NH4)2SO4 4.0g,蒸馏水1000mL。30℃,200rpm,装液量50mL/250mL,摇瓶振荡培养48h。
     3发酵液经40%饱和度硫酸铵盐析和Sephadex G-50柱层析,可将有效物质与其他组分进行粗分离。以乙腈-0.1%TFA水溶液和甲醇-0.4%乙酸水溶液为流动相,选择合适的HPLC条件,确定最佳HPLC条件为甲醇:0.4%乙酸(28:72,v/v),色谱柱Kromasil C18柱(250×4.6mm,5μm),流速1.0mL/min,柱温30℃,270nm检测。HPLC分析结果表明,得到至少A、B两个有效组分,其保留时间分别是6.225min和10.899min,这使得抗菌物质的分离纯化更进一步。质谱分析表明,A、B两组分的分子量分别是218和392。
     4抗菌物质粗品在水、甲醇、乙醇中溶解度较大,丙酮和乙醚中次之,在氯仿和苯中不溶解;茚三酮反应为阴性;耐高温;对酸敏感;对蛋白酶和紫外线照射不敏感;在270nm和220nm附近有最大紫外吸收。
     5该菌株抑菌谱广,对多种病原细菌和真菌有拮抗作用。其中,抗菌
a’311, isolated from soil, exhibited potent growth inhibitory activities against several pathogens, such as Fusarium oxysporum f.sp. vasinfectum, Fusarium oxysporum, Phyllosticta thesefolia, Escherichia coli, Pasteurella multocida, Staphylococcus aureus and Bacillus sp. It was identified as Brevibacillus brevis XDH by 16S rDNA analysis, conformation, physiological and biochemical features. The best fermentation condition was chosen, and the antibacterial substance was isolated and extracted. The main results were as following:
     1 a’311 was identified as Brevibacillus brevis XDH by 16S rDNA analysis, conformation, physiological and biochemical features. The 16S rDNA sequence has been registered at Genbank under the accession number DQ279738.
     2 The best fermentation condition was glucose 16g,starch 2.5g,peptone 10g,bean powder 26g,corn plasm 1.0g,NaCl 7.5g,(NH4)2SO4 4.0g,distilled water1000mL,30℃, 200rpm and 48h.
     3 The antibacterial substance can be isolated from other groups by salting out with 40% (NH4)2SO4 and Sephadex G-50 analysis. The best HPLC flow phase was chosen when methanol and acetonitrile as organic phase. The HPLC condition was methanol:0.4% acetic acid(28:72,v/v), Kromasil C18 column(250×4.6mm,5μm), flow rate 1.0mL/min, column temperature 30℃and detection wavelength 270nm.The results showed that at least two groups were isolated with the retention time 6.225min and 10.899min, respectively. The preparation column was used to prepare the antibacterial substance under the condition of Kromasil C18 column (250×10mm,5μm), flow rate 3.5mL/min,column temperature 30℃and detection wavelength 270nm. Two
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