KSBB Journal

  • 제17권1호
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  • Pages.100-105
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  • 2002
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  • 1225-7117(pISSN)
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  • 2288-8268(eISSN)
한국생물공학회 (The Korean Society for Biotechnology and Bioengineering)
권호 표지

키티나제에 의한 키토올리고당의 생성활성 규명과 올리고당의 당별 분리 생산

Action Patterns of Chitinase and Separations of Chitooligosaccharides Produced by Chitinolytic Hydrolysis

  • 김광 (동아대학교 재료금속화학공학부 화학공학과)
  • Kim, Kwang (Division of Metallurgical and Chemical Engineering College of Engineering, Dong-A University)
  • 발행 : 2002.02.01
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⟨ 이전 논문 다음 논문 ⟩

초록

중합도 n$\leq$10을 갖는 N-아세틸-D-글루코사민(GlcNAc)을 미생물 Serratia marcesce-ns QM B14f6의 최소배지 회분식 발효를 이용하여 키틴 및 키토산을 분해하는 효소 키티나제(1.5 unit/mL) [키토바이아제(3.48 unit/mL)가 포함됨]를 생성시킨다. 효소 반응에 의한 키토올리고당의 생성 활성을 규명하기 위하여 부분적으로 탈아세틸화된 키토산을 효소적 가수분해 반응시킴으로써 생성된 N-아세틸-D-글루코사민과 D-글루코사민의 키토올리고당의 생성 패턴을 확인 조사한다. 이 혼합 올리고머로부터 CM-Sephadex의 컬럼 크로마토그래피에 의하여 당별로 분획시켜 추출한 헤테로 키토 올리고당들을 각각 N-아세틸화하고 이 최종 생성물을 전기투석 장치로서 정제하여 키토올리고 1-7당을 제조하였다. 부분적으로 탈아세틸화 키토산(환원당으로서 2697 mg/mL)을 효소반응에 의해 생성시킨 키토올리고당은 1당으로서 GlcNAc=4.25%, 2당 $(GlcNAc)_2$=4.49%, 3당 $(GlcNAc)_3$=11.1%, 4당 $(GlcNAc)_4$=2.5%, 5당 $(GlcNAc)_{5}$ =0.64%, 6당$(GlcNAc)_{6}$=2.12%, 7당 $(GlcNAc)_{7}$=1.21%가 각각 제조되었다.

N-acetyl-D-glucosamine oligosaccharides [(GlcNAc)n] whose degree of polymer-ization is from one to ten (n=1-10) were fractionated by column chromatography on CM-Sephadex. Electro dialysis from a partially deacetylated chitosan hydrolysate prepared crudely with the N-acetyl-D-glucosaminidase(chitinase) and exo-N, N'-diacetylchito-biohydrolase(chitobiase) of Serratia marcescens QM B1466. Reducing sugar compositions and sequences of the N-acetyl-glucosamine oligosaccharides were identified by N-acetylation, randomly cleavage with chitinase and ego-splitting with chitobiase. N-acetyl-glucosamine heterochitooligosaccharides with glucosamine oligosaccharides, (GlcN)n at the reducing end residues together with $(GlcN)_1\sim(GlcN)_4$ were detected. Separation was accomplished by prefractionation with election by 0 to 1.0 M NaCl gradient solution. $(GlcNAc)_1 =4.25%,\; (GlcNAc)_2=4.49%,; (GlcNAc)_3=11.1%,\; (GlcNAc)_4=2.5%,$$ $(GlcNAc)_{5}$=0.64%, $(GlcNAc)_{6}$=2.12% and $(GlcNAc)_{7}$=1.21%, respectively, were crystallized after electrodialysis and lyophilization Each N-acetyl-D-glucosamine oligosaccharides content were detected by HPLC.

키워드

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