Influences of cultural medium component on the production of poly(γ-glutamic acid) byBacillus sp. RKY3

  • Duk-Yeon Jung
  • Sunok Jung
  • Jong-Sun Yun
  • Jin-Nam Kim
  • Young-Jung Wee
  • Hong-Gi Jang
  • Hwa-Won RyuEmail author


In this study, the cultural medium used for the efficient production of γ-PGA with a newly isolatedBacillus sp. RKY3 was optimized. It was necessary to supplement the culture medium withl-glutamic acid and an additional carbon source in order to induce the effective production of γ-PGA. The amount of γ-PGA increased with the addition ofl-glutamic acid to the medium. The addition of 90 g/Ll-glutamic acid to the medium resulted in the maximal yield of γ-PGA (83.2 g/L). The optimum nitrogen source was determined to be peptone, but corn steep liquor, a cheap nutrient, was also found to be effective for γ-PGA production. Both the γ-PGA production and cell growth increased rapidly with the addition of small amounts of K2HPO4 and MgSO4·7H2O.Bacillus sp. RKY3 appears to require Mg2+, rather than Mn2+, for γ-PGA production, which is distinct from the production protocols associated with other, previously reported bacteria.Bacillus sp. RKY3 may also have contributed some minor γ-PGA depolymerase activity, resulting in the reduction of the molecular weight of the produced γ-PGA at the end of fermentation.


Bacillus biodegradable polymer culture medium glutamic acid poly(γ-glutamic acid) 


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Copyright information

© The Korean Society for Biotechnology and Bioengineering 2005

Authors and Affiliations

  • Duk-Yeon Jung
    • 1
  • Sunok Jung
    • 2
  • Jong-Sun Yun
    • 3
  • Jin-Nam Kim
    • 1
  • Young-Jung Wee
    • 1
  • Hong-Gi Jang
    • 4
  • Hwa-Won Ryu
    • 5
    Email author
  1. 1.Department of Material Chemical and Biochemical EngineeringChonnam National UniversityGwangjuKorea
  2. 2.BioNanotechnology Research CenterKorea Research Institute of Bioscience and BiotechnologyDaejeonKorea
  3. 3.BioHelixNajuKorea
  4. 4.Korean Institute of Natural Science Inc.NajuKorea
  5. 5.School of Biological Sciences and TechnologyChonnam National UniversityGwangjuKorea

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