麹菌の増殖と胞子形成に対する水分活性の影響
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概要
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Ten strains of Aspergillus were grown on a modified Czapek's agar which was adjusted to various water activity (Aω) levels with sucrose. The optimum Aω at which the maximum rate of linear growth was obtained was between 0.980 and 0.990 for seven strains of the Aspergillus oryzae group, and one strian each of A. flavus and A. usamii incubated at 25℃, 30℃, or 35℃. There are no definitive differences between the strains, at any incubation temperature. For A. niger, a slightly lower Aω_<opt-> of 0.970 was observed. The maximum rates of growth, as well as the ranges of Aω resulting in germination in 24 hr, were reduced at 25℃ for all the strains tested.The maximum yields of conidia were obtained at relative humidities between 96.0 and 99.5 percent at 25℃ or 30℃ for five stranis of A. oryzae and one strain of A. flavus used. The sodium chloride used to adjust the Aω of the medium caused specific inhibition of the growth of some strains.The water sorption isotherms of steamed rice and conidia were determined at 25℃. Freshly steamed rice was found to be a suitable medium for A. oryzae with respect to Aω.
- 公益社団法人日本生物工学会の論文
- 1977-09-25