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Enzymatic Production of Alkyl β-Glucoside Based on Transglycosylation Activity of Celluclast

Vol.41 No.10, 2012.10, 1417-1422 (6 pages)
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Abstract
Alkyl glucosides were synthesized using the transglycosylation reaction of Celluclast, the cellulase from Trichoderma reesei, with cellobiose and various alcohols. Glucose as a by-product of the reaction was removed using the immobilized yeast system. Among the alkyl glucoside products, the acceptor products of methanol and ethanol were confirmed as methyl β-D-glucopyranoside and ethyl β-D-glucopyranoside via MALDI-TOF MS and enzymatic analysis. Optimal yields of methyl β-glucoside and ethyl β-glucoside were 65.3% (mol/mol) and 59.0% (mol/mol), respectively, based on cellobiose consumed.

Alkyl-glucoside의 생산을 위하여 상용화 cellulase인 Celluclast의 당전이 반응을 사용하였다. 5가지 종류의 알코올을 acceptor molecule로 하여 반응을 살펴본 결과 methyl alcohol, ethyl alcohol, isopropanol 그리고 butanol에서 당전이 반응이 일어남을 확인하였다. 반응 수율이 높았던, methyl alcohol과 ethyl alcohol의 반응산물을 MALDI-TOF MS와 효소적인 방법을 사용하여 각각의 산물이 methyl β-D-glucopyranoside와 ethyl β-D-glucopyranoside임을 확인하였다. 시간대별 methyl-glucoside와 ethyl-glucoside의 생산량을 비교하여 본 결과 9시간에서 최대 생산 수율 65%(mol/mol)와 59%(mol/mol)를 각각 보였으며, 이후 반응은 진행되지 않았다. Cellulose의 당전이 반응으로 생성된 부산물인 glucose를 제거하기 위하여 고정화 효모 system을 도입하였고, 그 결과 glucose를 모두 제거할 수 있었다. 이상의 결과에서 Celluclast를 이용한 alkyl-glucoside의 생산을 성공적으로 수행하였고, 고정화 효모 system을 도입하여 친환경적으로 부산물을 제거하여 고순도의 ethyl-glucoside를 생산하였다.

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