지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
이용수1
2013
Abstract iTable of contents iiiList of Tables viiList of Figures viiiChapter 1. General introduction 11.1. Background 21.2. Protease 31.3. Octopus vulgaris 51.4. The source of the microbial protease 81.4.1. Bacteria 81.4.2. Mold 81.4.3. Yeast 91.4.4. Actinomycete 91.5. Isolation and purification of protease 91.5.1. Salting-out 91.5.2. Ion exchange chromatography 101.6. Application of protease 111.6.1. Application in food and feed 111.6.2. Application in detergent industry 111.6.3. Application in leather processing 121.6.4. Application in peptides synthesis 121.7. Objectives 12Chapter 2. Isolation and identification of protease-producing bacteria from Octopus vulgaris tract and its optimal condition of protease production 142.1. Introduction 152.2. Materials and methods 162.2.1. Materials 162.2.2. Reagents and apparatus 162.2.3. Culture medium 172.3. Methods 172.3.1. Screen of protease producing bacteria from octopus vulgaris gut 172.3.2. Measurement of protease activity 182.3.3. Identification of strains 192.3.4. Optimum fermentation conditions 202.4. Results and discussions 212.4.1. Screening results of protease-producing bacteria from Octopus vulgaris gut 212.4.2. 16S rRNA sequence analysis 262.4.3. Optimum fermentation conditions 302.5. Conclusions 46Chapter 3. Purification of protease obtained from two strains and its enzymatic properties 483.1. Introduction 493.2. Materials and apparatus 503.2.1. Material 503.2.2. Reagents and apparatus 503.3. Methods 513.3.1. Preparation of crude enzyme solution 513.3.2. Ammonium sulfate precipitation 513.3.3. Dialysis and concentration 513.3.4. Cellulose CM-52 cation exchange chromatography 513.3.5. DEAE-Sephadex A50 anion exchange chromatography 523.3.6. Sephadex G-100 gel chromatography 523.3.7. SDS-PAGE electrophoresis 523.3.8. Determination of protease activity 533.3.9. Measurement of protein content 533.3.10. Protease stability 533.4. Results and discussions 543.4.1. Cellulose CM-52 cation exchange chromatography 543.4.2. DEAE-Sephadex A50 anion exchange chromatography 563.4.3. Sephadex G-100 gel chromatography 593.4.4. SDS-PAGE electrophoresis 623.4.5. Detection of protein content 643.4.6. Protease stability 643.5. Conclusions 71Chapter 4. Application of Stain V-2 and L-2 744.1. Introduction 754.2. Materials and apparatus 764.2.1. Materials 764.2.2. Reagents and apparatus 764.3. Methods 774.3.1. Preparation of fermentation broth 774.3.2. Ultrafiltration 774.3.3. Antioxidant activity of octopus scraps peptides 774.3.4. Determination of peptide concentration 794.3.5. Preparation of experimental rats 794.3.6. Determination of protein content of the liver tissue of mice 804.3.7. Determination of antioxidant activity of hyderolysate on rats’ plasma and liver tissue 804.3.8. Data processing 824.4. Results and discussions 824.4.1. Standard curve of peptide concentration 824.4.2. Determination of free radical-scavenging activity 824.4.3. Effect of octopus scraps enzymatic hydeolysate on body weight of rats 894.4.4. Effect of antioxidant activities of hydeolysate on serum and liver tissue 914.5. Conclusions 102Summary 104References 106Abstract in Korean 119Acknowledgement 121
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