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Lactobacillus acidophilus GP4A 가 생산하는 박테리오신의 특성 및 정제
김세헌,한경식,주관석 한국유가공기술과학회 1999 Journal of Dairy Science and Biotechnology (JMSB) Vol.17 No.1
A bacteriocin produced by Lab. acidophilus GP4A isolated from fecal contents of pig was characterized. Lab. acidophilus GP4A produced a heat-stable and pH-resistant bacteriocin, which was hydrolyzed by trypsin and pepsin and active against various microorganisms. Lab. acidophilus GP4A produced bacteriocin at maximum rate when grown in MRS broth(pH 6.5∼7.5) at 37℃ or 40℃. The bacteriocin produced by Lab. acidophilus GP4A inhibited the growth of Lactobacillus delbrueckii subsp. lactis 4797 in early logarithmic phase. The bacteriocin was purified by ammonium sulfate precipitation and Octyl sepharose CL-4B column chromatography. The purification resulted in a final yield of 21.7% and a 13.6-fold increase in the specific activity.
DEAE - Cellulose 에 의한 산양유 Casein 의 분별 및 이화학적 성질에 관한 연구
김병철,김세헌,한경식,임동현,전우민,황광연 한국유가공기술과학회 2000 Journal of Dairy Science and Biotechnology (JMSB) Vol.18 No.1
This experiment was carried out to study fractionation and physicochemical characteristics of caprine casein. Acid caseins obtained from caprine colostral and normal milk were analyzed by chymosin treatment and fractionated by DEAE-cellulose column chromatography with linear gradient and electrophoresis. Protein, fat and lactose of caprine normal milk were 2.70±0.27%, 3.82±0.51%, and 4.10±0.29%, respectively. More non-protein nitrogen(NPN) was released by chymosin treatment from caprine colostral casein than normal casein. The electrophoretic pattern of caprine casein was not similar to that of bovine casein. Caprine normal casein was fractionated by DEAE-cellulose column chromatography with a 0.08∼0.18 M NaCl linear gradient into 5 peaks with the proportion of 5.27%, 26.07%, 25.97%, 30.40% and 12.29%, respectively. In order to identify the pure fraction, the chymosin-treated caprine normal casein was fractionated by DEAF-cellulose column chromatography with a 0.08∼0.18 M NaCl linear gradient into 6 peaks with the proportion of 17.06%, 9.10%, 17.85%, 20.11%, 27.03% and 8.85%, respectively.
낙농분야 농업정보화의 실태와 효율적 지도체계에 관한 연구
김세헌,한경식,강신호,임지영 한국유가공기술과학회 2001 Journal of Dairy Science and Biotechnology (JMSB) Vol.19 No.1
This survey suggests current dairy information system in Kyong-ki province and personal computer education for dairy farmers in Korea. With the development of internet and dairy database system, more effective, quick delivery of dairy management and technology would be possible. Dairy expert's E-mail advice and using multimedia will be a great method to provide dairy technologies in Korea.