Studies on the Cellulase Producing Microorganisms(Part I) -Isolation of the Cellulase Producing Molds and their Cultural Conditions-

Cellulase 생성균(生成菌)에 관(關)한 연구(硏究) (제1보(第1報)) -유용균(有用菌)의 분리(分離) 및 그 배양조건(培養條件)에 대(對)하여-

94 Cellulase producing strains were isoated from soils, composts, rotten woods and straws, and gastric contents and feces of herbivorous animals in various places. Among them, the strain MC-9, MC-10, MC-53 and MC-61 were found to be highly active in the degradation of carboxy methyl cellulose. Their cultural conditions adequate for the cellulase formation and effects of inorganic salts and various organic substances added to the wheat bran media were investigated. The results obtained are as follows; 1. Optimum conditions for the cellulase formation were MC-9: pH 5.5, temp. $35^{\circ}C$, incubation time 5 days, MC-10: pH 5.5-6.0, temp. $30^{\circ}C$, incubation time 5 days, MC-53: pH 3.5, temp. $30^{\circ}C$, incubation time 5 days, MC-61: pH 3.5-4.0, temp. 30-$35^{\circ}C$, incubation time 5 days. 2. Their cellulase activity in their optimum conditions were MC-9: CMC-LP(liquefying power). 87.7%, CMC-SP(saccharifying power) 3.20 glucose mg./gm. of the cultures/min., MC-10: CMC-LP 82.9%, CMC-SP 2.48 glucose mg./gm. of the cultures/min., MC-53: CMC-LP 72.4%, CMC-SP 1.76 glucose mg./gm. of the cultures/min., MC-61: CMC-LP 87.1%, CMC-SP 2.08 glucose mg./gm. of the cultures/min. 3. Additions of inorganic salts to the wheat bran media were not significant for the cellulase formation, but additions of soybean film and orange-peel pomace promoted the CMC-liquefying power 3 to 5 percent in wheat bran cultures of the strains.

각지(各地)에서 수집(蒐集)한 토양(土壤), 퇴비(堆肥), 부후목(腐朽木) 고류(藁類) 및 초식동물(草食動物)의 분(糞)과 위내용물(胃內容物)을 시료(試料)로 하여 94주(株)의 cellualase 생성균(生成菌)을 분리(分離)하고, 이중(中) CMC분해력(分解力)이 비교적(比較的) 강(强)한 MC-9, MC-10, MC-53 및 MC-61의 4균주(菌株)를 선정(選定)하여 이들 균(菌)의 cellulase 생성(生成)에 대(對)한 최적배양조건(最適培養條件) 및 무기(無機), 유기물질(有機物質)의 첨가효과(添加效果)를 검토(檢討)한 결과(結果)는 다음과 같다. 1. 선정(選定)한 4균주(菌株)의 cellulase 생산(生産)에 있어서의 최적(最適) 외적조건(外適條件)은 MC-9: pH 5.5, 온도(溫度) $35^{\circ}C$, 배양일수(培養日數) 5일(日) MC-10: $pH\;5.5{\sim}6.0$, 온도(溫度) $30^{\circ}C$, 배양일수(培養日數) 5일(日) MC-53 : pH3.5, 온도(溫度) $30^{\circ}C$, 배양일수(培養日數) 5일(日) MC-61 : $pH\;3.5{\sim}40$, 온도(溫度) $30{\sim}35^{\circ}C$, 배양일수(培養日數) 5일(日) 이었다. 2. 선정균주(選定菌株)의 cellulase 역가(力價)는 최적배양조건하(最適培養條件下)에서 MC-9 : CMC점도저하력(粘度低下力) 87.7%, CMC 당화력(糖化力) 3.20 glucose mg./국건물(麴乾物) gm./분(分) MC-10 : CMC점도저하력(粘度低下力) 82.9%, CMC 당화력(糖化力) 2.48 glucose mg./국건물(麴乾物) gm./분(分) MC-53 : CMC점도저하력(粘度低下力) 72.4%, CMC 당화력(糖化力) 1.76 glucose mg./국건물(麴乾物) gm./분(分) MC-61 : CMC점도저하력(粘度低下力) 87.1%, CMC 당화력(糖化力) 2.68 glucose mg./국건물(麴乾物) gm./분(分) 이었다. 3. 선정균(選定菌)을 밀기울 배양(培養)할 시(時)에 무기염류(無機鹽類) 첨가(添加)의 효과(效果)는 인정(認定)할 수 없었으며 유기물질(有機物質)로서 대두피(大豆皮)와 감귤피(柑橘皮)의 첨가(添加)는 $3{\sim}5%$의 CMC점도저하력(粘度低下力)을 향상(向上)시키는 효과(效果)를 보였다.