L_Glutamic acid 발효생산에 관한 연구 (제이보) Tapioca Pellets 효소 당화액을 이용한 L_Glutamic acid 생산 Studies on the L-Glutamic acid Fermentation(Part II) L-Glutamic acid Production Employing Enzymatic Hydrolyzate of Tapioca Pellets as Carbon Source원문보기
본 실험은 Mirococcus glutamicus 균수에 의한 L-Glutamic acid 발효 생산에 있어서 Tapioca 전분의 효소당화액의 이용 가능성을 검토하였으며, 그 결과는, 20%농도의 Tapioca 전분유액에 고온성 액선균 액화효소(3000 DU/ml)를 기업 g당 30 DU 첨가하고, 85$\pm$1$^{\circ}C$, PH 6.0에서 90분간 액화한 후, Glucoamylase(4050 AU/g)을 기질 g당 15 AU 첨가하고, 55$^{\circ}C$, pH 5.0에서 36시간 가수분해시킨 당화액을 탄소원으로 사용하였을 경우가 L-Glutamic acid 생산양이 가장 양호하였다. 경화액중의 Biotin함양은 16$\mu\textrm{g}$/l로서, 과양의 Biotin농도로 인한 L-Glutamic acid 생산억제를 해결하기 위하여 첨가된 penicillin농도는 배양액ml당 10 I.U.로 배양 5시간 후 첨가하었을 경우가 가장 양호한 결과를 나타냈으며, L-Glutamic acid 생산양은 배양 60시간에서 38.5 g/l로 최대치를 나타냈다.
본 실험은 Mirococcus glutamicus 균수에 의한 L-Glutamic acid 발효 생산에 있어서 Tapioca 전분의 효소당화액의 이용 가능성을 검토하였으며, 그 결과는, 20%농도의 Tapioca 전분유액에 고온성 액선균 액화효소(3000 DU/ml)를 기업 g당 30 DU 첨가하고, 85$\pm$1$^{\circ}C$, PH 6.0에서 90분간 액화한 후, Glucoamylase(4050 AU/g)을 기질 g당 15 AU 첨가하고, 55$^{\circ}C$, pH 5.0에서 36시간 가수분해시킨 당화액을 탄소원으로 사용하였을 경우가 L-Glutamic acid 생산양이 가장 양호하였다. 경화액중의 Biotin함양은 16$\mu\textrm{g}$/l로서, 과양의 Biotin농도로 인한 L-Glutamic acid 생산억제를 해결하기 위하여 첨가된 penicillin농도는 배양액ml당 10 I.U.로 배양 5시간 후 첨가하었을 경우가 가장 양호한 결과를 나타냈으며, L-Glutamic acid 생산양은 배양 60시간에서 38.5 g/l로 최대치를 나타냈다.
The possibility of using tapioca pellets as a raw material in glutanmic acid fermentation by Microcuccus glutamicus is shown. The ground pellets were diluted with water to 20% solid level and treated with $\alpha$-anylase prepared from a thermophilic Actinomycetes strain culture for 90 mi...
The possibility of using tapioca pellets as a raw material in glutanmic acid fermentation by Microcuccus glutamicus is shown. The ground pellets were diluted with water to 20% solid level and treated with $\alpha$-anylase prepared from a thermophilic Actinomycetes strain culture for 90 min at 85$^{\circ}C$ under pH 6.0. The liquefied solution was further saccharified with commercial glucoamylase for 36 hours under the reaction conditions of 55$^{\circ}C$ and pH 5.0. The inhibitory effect of excess biotin content, 16 $\mu\textrm{g}$ Per liter of the hydrolzate, could be reduced effectively by adding 10 IU of penicillin per ml of the medium after five hours of the fermentation. The maximum glutamic acid yield of 38.5 g/l was obtained after 60 hours of shaking culture at 28-3$0^{\circ}C$.
The possibility of using tapioca pellets as a raw material in glutanmic acid fermentation by Microcuccus glutamicus is shown. The ground pellets were diluted with water to 20% solid level and treated with $\alpha$-anylase prepared from a thermophilic Actinomycetes strain culture for 90 min at 85$^{\circ}C$ under pH 6.0. The liquefied solution was further saccharified with commercial glucoamylase for 36 hours under the reaction conditions of 55$^{\circ}C$ and pH 5.0. The inhibitory effect of excess biotin content, 16 $\mu\textrm{g}$ Per liter of the hydrolzate, could be reduced effectively by adding 10 IU of penicillin per ml of the medium after five hours of the fermentation. The maximum glutamic acid yield of 38.5 g/l was obtained after 60 hours of shaking culture at 28-3$0^{\circ}C$.
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