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KMID : 0903519750180010023
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Journal of the Korean Society of Agricultural Chemistry and Biotechnology
1975 Volume.18 No. 1 p.23 ~ p.29
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Studies on the Induction of Available Mutants of Takju Yeast by UV light Irradiation .(Part Ⅲ)
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Abstract
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This experiment was conducted to study the effects of temperature and pH upon the acid productivity of the acid producing mutant induced by the treatment of ultraviolet light, and to identify the producing acid by PPC and p-oxydiphenyl method.
Chemical composition of Takju mash brewed with selected yeast and producing acid were observed and the results were as follows.
1) There was no apprecible difference in acid producing activity of mutant at 25℃ to 30℃.
2) The acid producing activity of mutant was little below pH 4 and was gradually increased according to approach nenutral, and the accumulation of acid was amounted to 0.5-0.7% as a lactic acid at pH 5 to 7 within 48 hrs of fermentation.
3) The acid produced by mutant was detected to the lactic acid.
4) In the cases of the Takju was brewed with the starter from the acid producing mutant the requirement of Ipkuk was 5% for all the raw materials, on the contrary, using orginal strain the requirement of Ipkuk was 20%.
5) In the case of both starters from the acid producing mutant and orginal strain were added at different brewing times, and only Bunkuk was used as a saccharifying agent (without Ipkuk), Takju was able to brewed more repidly and successfully than the case of general process.
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