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微生物 蛋白質을 生産하기 爲한 메탄올 資化酵母에 關한 硏究
정희종(Hee-Jong Chung) 한국식품영양과학회 1986 한국식품영양과학회지 Vol.15 No.4
Methanol을 利用하여 Single Cell Protein(SCP)을 生産하기 위한 基礎硏究로서 自然界에서 methanol資化酵母를 分離ㆍ同定하고 培養條件을 調査한 結果는 다음과 같다.<br/> 1. 本 methanol 資化酵母는 Candida boidinii로 同定되었고<br/> 2. 本 資化酵母의 最適 pH는 5.0이고 最適溫度는 28~30℃이었다.<br/> 3. 本 資化酵母는 最初 methanol濃度 2%의 培地에서 培養하면서 培養 36時間 後부터 每 12時間마다 0.5%의 methanol을 添加한 배지에서 가장 왕성한 生育을 보였다.<br/> 4. Thiamine(1000㎍/ℓ)과 biotin(10㎍/ℓ)을 添加했을때 生育이 促進되었다.<br/> 5. 最適 生育條件에서 0.268g/100㎖의 菌體量을 얻을 수 있었다. A methanol-assimilating yeast for the production of Single Cell Protein was isolated from the soil and identified. Methanol as a sole carbon source was used in this study. The strain was identified as Candida boidinii which grew best at the initial concentration of methanol at 2%, with the addition of 0.5% methanol at every 12 hours. The Single Cell Protein production was maximal after 72 hours of incubation at pH 5.0, 30℃. Thiamin and biotin were stimulated the growth of this yeast at the levels of 1000㎍/ℓ and 10㎍/ℓ, respectively.
강성국(Seong Kuk Kang),정희종(Hee Jong Chung) 한국응용생명화학회 1995 Applied Biological Chemistry (Appl Biol Chem) Vol.38 No.4
Fig leaves were extracted with methanol and then fractionated with ethyl acetate and various buffers to get active fractions, and their antimicrobial activities in each fraction were determined. Acidic fraction and phenolic fraction of dig leaves showed strong antimicrobial activities, but the basic fraction and neutral fraction did not show any activities. The degree of antimicrobial activities in phenolic fraction against tested bacteria were higher than those in acidic fraction, but these against yeasts and mold were almost equivalent to those in acidic fraction. Especially, phenolic fraction showed the strongest activities against Staphylococcus aureus and Pseudamonas aeruginosa. Although there were some differences among microorganisms, minimum inhibition concentrations(MIC) in acidic and phenolic fractions against tested microorganisms were 0.05 to 0.1 g eq./㎖ aed 0.01 to 0.25 g eq./㎖, on the basis of fresh sample weight, respectively. Minimum lethal concentrations(MLC) in acidic and phenolic fractions were 0.25 to 2.00 g eq./㎖ and 0.05 to 1.50 g eq./㎖, respectively. These supposed the antimicrobial activities in phenolic fraction were generally higher than those in acidic fraction and also phenolic fraction had lower MIC and MLC values than acidic fraction.
무화과잎 페놀성 분획중의 항미생물 활성물질의 정제 및 동정
강성국(Seong Kuk Kang),정동옥(Dong Ok Chung),정희종(Hee Jong Chung) 한국응용생명화학회 1995 Applied Biological Chemistry (Appl Biol Chem) Vol.38 No.4
Fig leaves were extracted with methanol and then fractionated with ethyl acetate and various buffers to get active fractions and determined the antimicrobial activities. The acidic and phenolic fractions fractionated from the methanol extract of fig leaves showed the strong antimicrobial .activities, but the basic and neutral fractions did not show any activities. The degree of antimicrobial activities of pheonlic fraction against: tested bacteria was higher than those of acidic fraction, but these against yeasts and mold were almost equivalent to those of acidic fraction. Especially, phenolic fraction was mostly affected on Staphylococcus aureus and Pseudomonas aeruginosa. Four antimicrobial substances purified from the phenolic fraction which showed the strongest antimicrobial activities among the fractions from fig leaves, were identified as psoralen(C_(11)H_6O₃, MW. 186), bergapten(C_(12)H_8O₄, MW. 216), β-sitosterol(C_(29)H_(50)O, MW. 414) and umbelliferone (C_9H_6O₃, MW. 162).