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Journal of forest science, v.26 no.2, 2010년, pp.137 - 148
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The high costs for ethanol production with lignocellulosic biomass as a second generation energy materials currently deter commercialization of lignocellulosic biomass, especially wood biomass which is considered as the most recalcitrant material for enzymatic hydrolysis mainly due to the high ligni...
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| 핵심어 | 질문 | 논문에서 추출한 답변 |
|---|---|---|
| 목질계바이오매스의 특징은? | 목질계바이오매스는 그 재료가 갖는 화학적 조직학적 특성상 Cellulose, Hemicellulose, Lignin과 같은 화학적 조성분이 상호 매우 견고하게 결합되어 있고, cellulose의 결정성과 같은 요소가 강하게 당화반응에 영향함으로 인해 에너지나 화학원료를 위한 공정이 쉽지 않은 것으로 알려져 있다. Cellulose의 효소 당화는 전체 반응에서 많은 영향인자들 간의 복잡한 반응이 요구되며 특히 문제가 되는 영향인자들은 cellulose의 중합도나 결정화도, 반응 시 기질의 크기 및 효소가 접근할 기질 표면적 크기나 리그닌 분포, 전처리과정에서 생산되는 효소활성 억제 물질 생산 등으로 거론되고 있다(Phillip et al, 1981; Fan et al, 1980; Fan et al, 1981; Grethlein et al, 1984; Rivers and Emert, 1988). | |
| 목질계 바이오매스가 상용화에 어려움이 있는 이유는? | 목질계 바이오매스로부터 에너지 원료를 얻어내기 위해서는 우선 상술한 영향인자들에 대한 세심한 연구를 통해 해결방안을 모색한 공정이 도출되어야 효율성을 갖출 것으로 평가되고 있다. 이러한 이유로 목질바이오매스는 효소 당화성을 증진시키기 위한 전처리, 단당류를 얻기 위한 당화처리, 단당류(육탄당, 오탄당)를 발효시키는 기술 등이 전분계 원료에 비해 복잡한 생산 공정과 비용이 소요되어 상용화에 어려움을 가지고 있는 것이 사실이다(Sassner et al, 2008). | |
| Cellulose의 효소 당화에서 문제가 되는 영향인자는? | 목질계바이오매스는 그 재료가 갖는 화학적 조직학적 특성상 Cellulose, Hemicellulose, Lignin과 같은 화학적 조성분이 상호 매우 견고하게 결합되어 있고, cellulose의 결정성과 같은 요소가 강하게 당화반응에 영향함으로 인해 에너지나 화학원료를 위한 공정이 쉽지 않은 것으로 알려져 있다. Cellulose의 효소 당화는 전체 반응에서 많은 영향인자들 간의 복잡한 반응이 요구되며 특히 문제가 되는 영향인자들은 cellulose의 중합도나 결정화도, 반응 시 기질의 크기 및 효소가 접근할 기질 표면적 크기나 리그닌 분포, 전처리과정에서 생산되는 효소활성 억제 물질 생산 등으로 거론되고 있다(Phillip et al, 1981; Fan et al, 1980; Fan et al, 1981; Grethlein et al, 1984; Rivers and Emert, 1988). 한편 cellulose 효소 당화에 영향하는 인자로는 endo-glucanase(EG), cellobiogydrase(CBH), β-glucosidase(BGL)와 같은 여러 cellulase 상호 간의 상승작용, 기질에 대한 효소 흡착성 등이 연구되고 있다(Henrissat et al, 198; Nidetzky et al, 1994). |
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