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pp.1095-1100
Keratin wastes are generated in excess of million tons per year worldwide and biodegradation of keratin by microorganisms possessing keratinase activity can be used as an alternative tool to prevent environmental pollution. For practical use of keratinase, its physicochemical properties should be investigated in detail. In this study, we investigated characteristics of keratinase produced by Xanthomonas sp. P5 which is isolated from rhizospheric soil of soybean. The level of keratinase produced by the strain P5 increased with time and reached its maximum (10.6 U/ml) at 3 days. The production of soluble protein had the same tendency as the production of keratinase. Optimal temperature and pH of keratinase were 40℃-45℃ and pH 9, respectively. The enzyme showed broad temperature and pH stabilities. Thermostability profile showed that the enzyme retained 94.6%-100% of the original activity after 1 h treatment at 10℃-40℃. After treatment for 1 h at pH 6-10, 89.2%-100% of the activity was remained. At pH 11, 71.6% of the original activity was retained after 1 h treatment. Although the strain P5 did not degrade human hair, it degraded duck feather and chicken feather. These results indicate that keratinase from Xanthomonas sp. P5 could be not only used to upgrade the nutritional value of feather hydrolysate but also useful in situ biodegradation of feather.
1. 서 론
2. 재료 및 방법
2.1. 실험균주 및 배양조건
2.2. 케라틴 분해효소의 물리화학적 특성 조사
2.3. 분석방법
3. 결과 및 고찰
3.1. 케라틴 분해효소의 생산
3.2. 케라틴 분해효소 활성에 대한 온도 및 pH의 영향
3.3. 케라틴 분해효소의 온도 및 pH 안정성
3.4. 케라틴 분해효소의 기질특이성
4. 결론
참고문헌
