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中国农学通报 ›› 2017, Vol. 33 ›› Issue (17): 12-18.doi: 10.11924/j.issn.1000-6850.casb16100089

所属专题: 生物技术

• 生物技术科学 • 上一篇    下一篇

一株碱性木聚糖酶产生菌的筛选及发酵条件的优化

易旭东1,潘 虎2,田 云1,刘博伦1,林元山1   

  1. (1湖南农业大学生物科学技术学院,长沙 410128;2西藏自治区农牧科学院农业质量标准与检测研究所,拉萨 850000)
  • 收稿日期:2016-10-22 修回日期:2016-12-13 接受日期:2016-12-23 出版日期:2017-06-16 发布日期:2017-06-16
  • 通讯作者: 林元山
  • 基金资助:
    湖南省科技厅农村领域重点研发项目资助“水稻秸秆谷壳资源化利用与功能性低聚木糖的制备研究”(2016NK2114);湖南省研究生科研创新项目资助“碱性木聚糖酶的发酵制备及其相关基因的克隆”(CX2016B294);西藏自治区财政专项资金项目“拉萨河谷地区农田土壤有益微生物的研究与应用”。

Screening of a Strain Producing Alkaline Xylanase and Optimization of Fermentation Conditions

Yi Xudong1, Pan Hu2, Tian Yun1, Liu Bolun1, Lin Yuanshan1   

  1. (1College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha 410128; 2Tibet Agriculture and Animal Husbandry Institute of Agricultural Quality Standards and Testing, Lhasa 850000)
  • Received:2016-10-22 Revised:2016-12-13 Accepted:2016-12-23 Online:2017-06-16 Published:2017-06-16

摘要: 碱性木聚糖酶广泛用于造纸、纺织等领域。为筛选出高产碱性木聚糖酶的菌株,采用刚果红显色法,从山西省晋城市植物园土壤中筛选出一株碱性木聚糖酶产生菌株YH158,通过形态鉴定及16S rDNA序列分析,鉴定为甲基营养型芽孢杆菌(Bacillus methylotrophicus)。经发酵条件单因素优化及4因素3水平正交试验分析,确定了最佳的产酶培养基配方:麸皮5.0%、黄豆粕0.7%、硫酸锰0.1%。最佳培养条件:培养基初始pH 8.0,转速180 r/min,37℃发酵36 h,通过发酵条件的优化最终得到发酵液酶活为28.18 IU/mL。该菌产生的木聚糖酶具有较高的碱性适应性,水解产物富含2~5个木糖分子的低聚木糖,具有较高的工业应用前景。

关键词: 低温冻害, 低温冻害, 风险指标, 灰色关联, 区划, 冬小麦

Abstract: Alkaline xylanase widely used in paper making,textile and other fields.In screening the strains of the high-yield alkaline xylanase, a alkaline xylanase generating strain YH158 is isolated from the soil of the botanical garden in Jincheng City, Shanxi Province by congo red color reaction. Morphological test and 16S rDNA sequence analysis were employed to confirm as bacillus methylotrophicus. After one factor was used to optimize, and the orthogonal test including four factors and three levels were employed to analyze, the superior fermentation medium formulation was determined:wheat bran5.0%, soyabean extraction 0.7%, MnSO4 0.1%,The optimal culture condition: initial cultural pH 8.0;temperature 37 ℃ ;agitation 180 r/min; fermentation period 36 h. The enzyme activity in supernatant of the fermentation broth was 28.18 IU/mL. Xylanase produced by this bacterium shows preferred alkaline adaptability, and its hydrolysis products are rich in xylo-oligosaccharide with 2-5 xylose molecules, displaying higher industrialization prospect.

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