KSBB Journal

The Korean Society for Biotechnology and Bioengineering (한국생물공학회)
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Lactic Acid Production from Xylose by Extractive Fermentation using ion-Exchange Resin

이온고환 수지를 이용한 Xylose로부터 젖산의 추출발효

  • 김기복 (경기대학교 식품생물공학과) ;
  • 신광순 (경기대학교 식품생물공학과) ;
  • 권윤중 (경기대학교 식품생물공학과)
  • Published : 2002.12.01
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Abstract

In lactic acid fermentation, the end product inhibition by lactic acid causes several problems. The most important of which are low lactate formation rate and its recovery from fermentation broth. To overcome these problems, extractive lactic acid fermentation was carried out in a bioreactor, which was connected to a column packed with anion exchange resin (Amberlite IRA-400, 250 g). The system was started as a batch process, and then the separation process was started when the lactic acid concentration reached 10 g/L, 20 g/L or 30 g/L. In each case, total lactic acid concentration was reached to 48.6, 53.6, 52.6 g/L with its productivity of 1.2 g/L $.$ h, 1.6 g/L $.$ h, and 1.3 g/L $.$ h, respectively Especially, in the case of the 20 g/L recycling-initiation process, extractive fermentation reduced tie fermentation time (17 hrs) by 34% in comparison with the conventional batch process. The direct consequence of this time reduction was shown by a 1.8 fold increase in overall lactic acid productivity.

Lactococcus lactis IO-1를 이용하여 xylose로부터 젖산발효를 수행한 결과 기질농도가 50 g/L에서 100 g/L로 증가됨에 따라 생육저해 및 생산성감소가 일어났다. 따라서 이온교환수지(Amberlite IRA-400, 250 g)를 이용하여 젖산을 발효 중에 제거함으로 최종산물저해를 완화시킬 수 있는 추출발효를 수행하였다. 초기 xylose 100 g/L에서 발효조내 젖산농도 20 g/L 에서 추출발효를 시작한 결과 기질을 거의 모두 소비하여 총53.6 g/L의 젖산을 생산하였으며 1.6 g/L·h의 생산성을 나타냈다. 이는 일반적인 회분발효에 비해 약 1.8배 향상된 결과로써 향후 수지에 젖간의 흡착을 저해하는 문제점을 개선함으로써 이온교환수지의 젖산 흡착량을 늘릴 수 있는 방안을 모색한다면 지금 보다 더 나은 생산성을 나타낼 것으로 사료된다.

Keywords

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