β-poly(L-malic acid) production by fed-batch culture of Aureobasidium pullulans ipe-1 with mixed sugars

Weifeng Cao, Jianquan Luo, Benkun Qi, Juan Zhao, Changsheng Qiao, Luhui Ding, Yi Su, Yinhua Wan

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

β-poly(l-malic acid) (PMLA) is a biopolyester, which has attracted growing attention due to its potential applications in medicine and other industries. In this study, the biosynthetic pathway of PMLA and the fermentation strategies with mixed sugars were both investigated to enhance PMLA production by Aureobasidium pullulans ipe-1. Metabolic intermediates and inhibitors were used to study the biosynthetic
pathway of PMLA. It showed that exogenous addition of l-malic acid, succinic acid, TFA, and avidin had negligible effect on PMLA production, while pyruvic acid and biotin were the inhibitors, indicating that PMLA biosynthesis was probably related to phosphoenolpyruvate via oxaloacetate catalyzed by phosphoenolpyruvate carboxylase. Sucrose was suitable for achieving the highest PMLA concentration, while fructose generated a higher yield of PMLA (PMLA produced per biomass). Furthermore, the fed-batch culture using fed solution with different sugar mixture for PMLA production was implemented. During the fed-batch culture with mixed solution, fructose could increase PMLA production. Compared with the batch culture, the feeding with mixed sugar (sucrose and glucose) increased PMLA concentration by 23.9%, up to 63.2 g/L, and the final volume of the broth was increased by 25%. These results provide a good reference for process development and optimization of PMLA production.
Original languageEnglish
JournalEngineering in Life Sciences (Online)
Pages (from-to)180-189
ISSN1618-2863
Publication statusAccepted/In press - 2014
Externally publishedYes

Keywords

  • Aureobasidium pullulans
  • β-poly (malic acid)
  • Carbon source
  • Fed-batch culture
  • Mixed sugars

Cite this

Cao, W., Luo, J., Qi, B., Zhao, J., Qiao, C., Ding, L., Su, Y., & Wan, Y. (Accepted/In press). β-poly(L-malic acid) production by fed-batch culture of Aureobasidium pullulans ipe-1 with mixed sugars. Engineering in Life Sciences (Online), 180-189.