微生物の発育に及ぼす金属イオンの影響(第8報) : 生産培地に於ける金属塩の効果

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Hitherto, the effectiveness of zinc was studied mainly with synthetic media. In this paper, the effects of zinc added to media used for industrial production process were dealt with. 1. When Hansenula anomala is grown in koji extract, the formation of ester order and formation of mycelial mat were enhanced by the addition of zinc, whose optimum quantity was found to be 10 ppm. 2. In the production of rice-koji, the addition of 100ppm ZnSO_4 was shown to have the effect of reducing the duration of culture required by about 5 hours. 3. Since the yield of alcohol was presumed to be affected by the primary contamination of bran, in the production of alcohol using mold bran as only, it was attempted to avid the contamination by adding CuSO_4. The results showed that relatively high concentration of Cu did not lower the saccharifying power produced in such a solid culture while the growth of primary contaminants (bacteria) was markedly suppressed. 4. For producing mold starter the mixture of Cu-, Zn-, Mn- and Al-salts could be used as the substirute of wooden ash. The mold starter produced by use of such artificial ash had the color not different from that of the ordinary one produced with wooden ash, and the rice-koji produced with the above artificial ash also showed no difference form the ordinary one. 5. The effect of zinc on the formation of ester odor by sake-yeast (Kyokai No.6) was recognized by sensory tests as well as by gas chromatography.
社団法人日本生物工学会の論文
1961-11-15

微生物の発育に及ぼす金属イオンの影響(第8報) : 生産培地に於ける金属塩の効果

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