최소 단어 이상 선택하여야 합니다.
최대 10 단어까지만 선택 가능합니다.
다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
NTIS 바로가기생명과학회지 = Journal of life science, v.22 no.2 = no.142, 2012년, pp.266 - 280
Agar is a cell wall component of macro red algae that can be hydrolyzed by agarase. Agarases are classified into
핵심어 | 질문 | 논문에서 추출한 답변 |
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한천 다당류가 여러 산업에서 안정제로 널리 사용되는 까닭은 무엇인가? | 한천 다당류는 친수성 고분자로 콜로이드의 성질이 있어 0.2~0.3%의 농도로도 겔 형성능이 있으며 85℃ 이하에서는 녹지 않아 식품산업에서 고온으로 제조되는 빵 제품과 과자류의 안정제로 널리 사용되고 있으며, 우유, 유제품, 청량음료 등의 생산에도 이용되고 화장품과 약품 등의 안정제로 많이 쓰이고 있다. 즉, 식품산업에서 겔화제, 안정제, 점증제, 변색방지제, 청징제로 사용되고 있고, 연구개발 분야에서도 통상적인 배지용 겔화제 이외에 식물의 조직배양용 배지의 겔화제로도 쓰이며, 의약분야에서는 치과인상제 등으로도 사용된다[50]. | |
한천의 구성 물질은 각각 어떤 특징을 갖는가? | 한천(agar)은 galactan에 속하며 홍조류에 많이 함유되어 있고 agarose와 agaropectin으로 이루어진 혼합물이다. Agarose는 D-galactose와 3,6-anhydro-L-galactose(AHG)가 단위체로 이들이 교차 결합하여 직쇄구조로 되어 있으며 겔(gel) 형성능력이 강하다. Agaropectin은 agarose와 같이 agarobiose 단위로 되어 있으나 황산기 등의 산성기를 함유하며 겔 형성능력이 약하다. 해조류인 Chondrus crispus 등에서 얻어지는 고점성의 galactan을 carrageenan이라 하며 식품의 젤리화제로 널리 이용되고 있다[57]. | |
한천의 효소분해산물은 무엇이며 이들은 어떤 기능성이 있는가? | 한천은 그 자체로 식품산업과 의약품, 향장품 산업 등에 이용되지만 한천의 효소분해산물인 한천올리고당(agarooligosaccharides)이나 네오한천올리고당(neoagarooligosaccharides)은 항암 효과, 면역증진 효과, 항산화 효과, prebiotic 효과, 간보호 효과, 항균 효과, 미백 효과, 보습 효과 등의 다양한 기능성이 보고되어 있어 고부가가치 기능성물질의 가능성이 매우 높다. 따라서 한천을 분해하는 효소인 agarase와 agarase를 생산하는 세균을 탐색하기 위해 많은 연구가 진행되었으며 저자들도 한천 분해세균의 탐색, agarase 유전자 확보 및 재조합 발현, 기존 agarase 유전자의 돌연변이를 통한 특성 개선, agarase를 이용한 한천분해산물의 제조와 그 기능성 등을 보고하였다[54-56,75-79]. |
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