Quantitative response of cell growth and Tuber polysaccharides biosynthesis by medicinal mushroom Chinese truffle Tuber sinense to metal ion in culture medium.
During the submerged fermentation of medicinal mushroom Chinese truffle Tuber sinense, there was no significant effect of metal ion on the cell growth and the production of intracellular polysaccharides, while metal ion and its concentration significantly affected the production of extracellular polysaccharides (EPS). By using the approach of "one-variable-at-a-time", 50 mM Mg2+ was identified to be the most favorable for EPS production, and the next was 10 mM K+. A mathematical model, constructed by response surface methodology combination with full factorial design, was applied to study the synergic effect of Mg2+ and K+. EPS production reached its peak value of 5.86 g/L under their optimal combination of 30 mM Mg2+ and 5 mM K+ predicted by the model, which was higher by 130.7% compared with the basal fermentation medium without metal ion. The validation experiment showed the experimental values agreed with the predicted values well. EPS production obtained in this work was the highest reported in the culture of T. sinense.
Tang
Ya-Jie
YJ
Hubei Provincial Key Laboratory of Industrial Microbiology, College of Bioengineering, Hubei University of Technology, Wuhan 430068, China. yajietang@hotmail.com
Zhu
Ling-Li
LL
Liu
Rui-Sang
RS
Li
Hong-Mei
HM
Li
Dong-Sheng
DS
Mi
Zhi-Yuan
ZY
D000363:Agaricales / Q000166:cytology / Q000254:growth & development* / Q000378:metabolism*; D018533:Biomass; D049109:Cell Proliferation / Q000187:drug effects*; D003470:Culture Media / Q000737:chemistry; D004305:Dose-Response Relationship, Drug; D005285:Fermentation; D007477:Ions / Q000494:pharmacology; D008670:Metals / Q000494:pharmacology*; D011134:Polysaccharides / Q000096:biosynthesis*
D003470:Culture Media; D007477:Ions; D008670:Metals; D011134:Polysaccharides