Paper Title:
Effects of Yeast Extract on Poly-ε-Lysine Production in Batch Culture of Streptomyces Albulus
  Abstract

Yeast extract (YE) is a sole organic nitrogen source in a commonly medium 3G for Streptomyces albulus to produce poly-ε-lysine (ε-PL). In this study, five YEs from five commercial suppliers were used to evaluate their effects on the growth of Streptomyces albulus 213 and ε-PL production. YE from bakers’ yeast with the highest total nitrogen content (TN), α-amino nitrogen content (AN) or the ratio of AN/TN produced the highest yield of ε-PL, while YE from brewers’ yeast with the highest RNA content got the most dry cell weight (DCW). However, there was little correlation between TN, AN or AN/TN in YE and the yield of ε-PL. There was also weak correlation between RNA in YE and DCW. When 60% baker YE was mixed with 40% brewer YE, the yield of ε-PL reached 1.89 g/l and increased by 16% and 37% than those of baker YE and brewer YE, respectively. Furthermore, five kinds of vitamins and nine kinds of amino acids were screened to supplement baker YE. When 6 mg/l biotin, 5mg/l pantothenic acid, 0.7 g/l L-glutamine and 0.5 g/l L-arginine were mixed with baker YE in M3G, ε-PL reached maximum production respondent to 3.05 g/l that was 61.4% higher than control.

  Info
Periodical
Advanced Materials Research (Volumes 343-344)
Chapter
Session 3: Biology-Related Materials Research in Environmental Protection
Edited by
David Wang
Pages
1023-1028
DOI
10.4028/www.scientific.net/AMR.343-344.1023
Citation
X. Chen, Z. Wang, Y. Z. Wang, F. T. Jiang, D. S. Li, J. H. Wang, "Effects of Yeast Extract on Poly-ε-Lysine Production in Batch Culture of Streptomyces Albulus", Advanced Materials Research, Vols. 343-344, pp. 1023-1028, 2012
Online since
September 2011
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$32.00
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