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Studies on the Enzyme of Rhizopus oryzae - Part I. Production of Acid Protease and Enzymatic Characteristics -
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Rhizopus oryzae의 효소(酵素)에 관(關)한 연구(硏究) - 제(第)1보(報), 산성(酸性) Protease 생산(生産) 및 효소(酵素)의 특성(特性) -

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Type
Academic journal
Author
Hou, Won-Nyong (충북대학교대학원농화학과) Chung, Man-Jae (충북대학교농과대학농화학과)
Journal
한국응용생명화학회 Applied Biological Chemistry Applied Biological Chemistry 제22권 제3호 KCI Accredited Journals SCOPUS
Published
1979.1
Pages
135 - 141 (7page)

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Studies on the Enzyme of Rhizopus oryzae - Part I. Production of Acid Protease and Enzymatic Characteristics -
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These experiments were conducted to investigate the conditions of the acid protease production by Rhizopus oryzae and the characteristics of crude enzyme. The results obtained were as follows: 1. The optimum culture time and the optimum amount of added water to the wheat bran medium were about 48 hrs and $80{\sim}120%$, respectively. 2. The addition of $(NH_4)_6Mo_7O_{24},\;(NH_4)_2SO_4,\;NH_4NO_3$, casein, and albumin, respectively, as nitrogen sources to the wheat bran medium was effective. Of these, the optimum concentrations of addition of $(NH_4)_6Mo_7O_{24}$ and casein which were the most effective were 0.1% and 1.0%, respectively. 3. The addition of glucose, galactose, maltose, lactose, and soluble starch, respectively, as carbon sources to the wheat bran medium was effective. Of these, the optimum concentration of addition of glucose which was the most effective was 3.0%. 4. The addition of $KH_2PO_4$ as a phosphate salt to the wheat bran medium was effective. The optimum concentration of addition of $KH_2PO_4$ was 0.3%. 5. The optimum pH for the enzyme action was 2.4, the optimum temperature about $40^{\circ}C$, and the stable pH range $2.0{\sim}5.0$. The enzyme was stab1e below $40^{\circ}C$. 6. The enzyme activity increased rapidly for 10 minutes after addition, thereafter it increased slowly. 7. The enzyme activity increased rapidly to 2 ml of addition, but nearly did not increase at the amounts greater than 2ml.

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