Production of Yeast from the Acid Hydrolyzate of the Waste Composts of Oyster Mushroom

느타리버섯 폐상퇴비(廢床堆肥) 산가수분해액(酸加水分解液)을 이용(利用)한 효모생산(酵母生産)

Culture conditions for yeast production from the acid hydrolyzate of the 2nd waste composts of oyster mushroom (Pleurotus ostreatus) were determined. Among the yeast strains tested, Candida quilliermondii JAFM 215, which was culture at $30^{\circ}C$, pH 5.0, showed good culture yield. Yeast production was the highest yield with the medium composition of 0.3% $NH_4Cl$, 0.15% $KH_2PO_4$, 0.02% $MgSO_4{\cdot}7H_2O$, and 0.05% $CaCl_2$. Yeast growth was increased at the concentration of 0.001 to 0.01% furfural, but at the higher concentration the yeast growth was inhibited. Utilization rate of sugar was 86.2%, and yield of yeast from sugar was 50.45%. Crude protein of yeast ranged from 50 to 52%.

느타리버섯 2주기퇴비당화액(2週期堆肥糖化液)으로 부터 효모생산(酵母生産)을 위하여 효모배양조건(酵母培養條件)을 검토(檢討)한 결과(結果) 여러 효모(酵母)중에서 Candida quilliermondii JAFM 215가 가장 양호(良好)하였고 최적(最適)pH와 온도(溫度)는 5.0, $30^{\circ}C$이었다. 효모생산(酵母生産)은 $NH_4Cl$ 0.3%, $KH_2PO_4$ 0.15%, $MgSO_4{\cdot}7H_2O$ 0.02%, $CaCl_2$ 0.05% 첨가(添加)가 가장 양호(良好)하였다. furfural은 $0.001{\sim}0.01%$ 농도(濃度)일때 효모(酵母)의 생육(生育)이 약간 증가(增加)되었으나 그 이상의 농도(濃度)에서는 저해(沮害)를 받았다. 당(糖)의 이용율(利用率)은 86.2%이고 당(糖)에 대한 효모(酵母)의 수율(收率)은 50.45%였으며 효모(酵母)의 조단백질(粗蛋白質)은 $50{\sim}52%$였다.