著者

赤木 盛郎

出版者

公益社団法人日本生物工学会

雑誌

醗酵工學雑誌 (ISSN:03675963)

巻号頁・発行日

vol.30, no.11, pp.440-444, 1952-11-15

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By using rice straw hydolysate as the culture medium of Neurospara sitophila, the following results were obtained.1) The amounts of (NH_4)_2SO_4,KH_2PO_4 and KNO_3 fitted for the growth of this fungus were 20〜40%, 4〜10% and 1〜2% of the sugar respectibely.2) To prevent the medium from decreasing of pH which is caused by the growth of fungus, addition of CaCo_3 to the medium is necessary.3) When this fungus was cultivated at 30℃ for 3 days in the hydrolysate added with 30% (NH_4)_2SO_4,7% KH_2PO_4,1% KNO_3,0.5% MgSO_4・7H_2O on the baseis of the sugar and CaCo_8,the yield of fungus to the sugar consumed was 60.87 %.4) The amount of peptone fitted for the growth of this fungus was 20 % of the sugar. When this fungus was cultivated at 30℃ for 3 days in the hydrolysate added with 20 % peptone, 7 % KH_2PO_4,1 % KNO_3 and 0.5 % MgSO_4・H_2O on the basis of the sugar, the yield of fungus to the sugar cosumed was 69.81%. In the medium containing a large amount of peptone, the pigment of this fungus was scarcely produced.5) The chemical composition of the mycelium, which was obtained from the culture in the hydrolysate added with 30 %(NH_4)_2SO_4,7 % KNO_3,0.5 % MgSO_4・7H_2O on the basis of the sugar and CaCO_3 was as follows : Moisture 12.96 %, ash 5.04 %, crude fat 7.65 %, crude protein 48.31 %, crude fiber 10.52 %, nitrogen-free extract 15.52%, reducing sugar 1.24 %.6) In the hydrolytic decomposition products of the mycelium obtained from the culture in the rice straw hydrolysate at 30℃ for 5 days, the following twelve amino acids were detected by the paper partition chromatography, i.e., glycine, alanine, valine, leucine, serine, cystine, arginine, phenyl alanine, tyrosine, asparagine, glutamic acid and aspartic acid.