食品科学 ›› 2011, Vol. 32 ›› Issue (5 ): 228-233.doi: 10.7506/spkx1002-6630-201105049

• 生物工程 • 上一篇    下一篇

酸性植酸酶产生菌的筛选、鉴定及发酵条件研究

李 文,王 陶   

  1. 徐州工程学院食品(生物)工程学院
  • 收稿日期:2010-06-22 修回日期:2011-02-12 出版日期:2011-03-15 发布日期:2011-03-03
  • 通讯作者: 李文 E-mail:wenlisony@163.com
  • 基金资助:
    江苏省高校自然科学研究面上项目(10KJD180006);徐州工程学院科研基金青年课题(XKY2009122)

Screening and Identification of a Strain Capable of Producing Acid Phytase and Optimization of  Its Fermentation Conditions

LI Wen,WANG Tao   

  1. College of Food (Biological) Engineering, Xuzhou Institute of Technology, Xuzhou 221008, China
  • Received:2010-06-22 Revised:2011-02-12 Online:2011-03-15 Published:2011-03-03
  • Contact: LI Wen, E-mail:wenlisony@163.com

摘要: 从土壤中筛选到一株产酸性植酸酶酶活较高的菌株,初步鉴定为黑曲霉,菌株最优发酵条件为:麸皮3g/100mL、(NH4)2SO4 0.5g/100mL、发酵液初始pH5.5、发酵时间84h,酶活力可达12.06U/mL。对其粗酶液的酶学性质研究表明:该酶最适作用pH值为5左右,最适温度是45℃;该酶在55℃保温30min后酶活力保留在60%左右;在酸性和中性条件下有一定的稳定性;金属离子Ca2+、 Fe2+、Na+、K+、Zn2+、Cu2+对酶有一定的抑制作用,Mg2+、Ba2+对酶有一定的激活作用。

关键词: 酸性植酸酶, 筛选, 发酵, 酶学性质

Abstract: A strain with higher acid phytase activity isolated from soil was identified as Aspergillus niger. The optimal fermentation conditions for improved production of phytase by the strain were incubation in a medium composed of 3 g/100mL wheat bran and 0.5 g/100mL (NH4)2SO4, at an initial pH of 5.5 for 84 h. Under the optimal fermentation conditions, the phytase activity was up to 12.06 U/mL. The optimal reaction pH and temperature of this enzyme were 5 and 45 ℃, respectively. The relative enzyme activity remained to be 60% after heating treatment at 55 ℃ for 30 min. In addition, the enzyme was stable in acidic and neutral media. The phytase activity was inhibited by Ca2+, Fe2+, Na+, K+, Zn2+ and Cu2+, while activated by Mg2+ and Ba2+.

Key words: acid phytase, screening, fermentation, enzyme property

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