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Impact of sodium or potassium concentration in glucose aquoes solution to fermentation by Kluyveromyces marxianus

배양액내 나트륨과 칼륨의 농도가 고온 발효 균주 Kluyveromyces marxianus의 발효에 미치는 영향

  • Song, Woo-Yong (Department of Wood and Paper Science, Chungbuk National University) ;
  • Shin, Soo-Jeong (Department of Wood and Paper Science, Chungbuk National University)
  • 송우용 (충북대학교 목재종이과학과) ;
  • 신수정 (충북대학교 목재종이과학과)
  • Received : 2015.05.22
  • Accepted : 2015.06.05
  • Published : 2015.06.30

Abstract

In acid hydrolysis process of biomass saccharification. neutralization of acid hydrolyzate is essential step, which resulted in dissolved cations in glucose solution. Impact of cations to Kluyveromyces marxianus in glucose solution was investigated focused on ethanol fermentation. Either potassium or sodium cations decreased the ethanol fermentation and glucose to ethanol conversion. Glucose consumption by K. marxianus was delayed by increasing potassium cation concentration as completely consumed within 12 h in potassium cation 0.46 mol and 0.92 mol but within 24 h in potassium cation 1.38 mol. Also, ethanol fermentation process was slowed down with increasing concentration of the potassium sulfate. Fermentation of glucose solution to ethanol was more inhibited by sodium cation than potassium cation in glucose solution. Glucose was completely consumed within 24 h in sodium cation 0.95 mol. but at 1.90 mol or 2.84 mol in sodium cation could not finish the fermentation within 48 hour. Ethanol concentration was 22.26 g/L at low sodium cation in glucose solution with complete fermentation within 24 h. With increasing sodium cation in glucose solution, final ethanol concentration was reached at 14.10 g/L (sodium cation con) and 0.21 g/L (sodium cation con), which meant delaying of fermentation by sodium cations.

Keywords

References

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