Abstract
It is demonstrated for the first time that a species from the genusHumicola is a potential source of acid protease. A strain was classified by morphological investigations asHumicola lutea. The influence of constituents of the culture medium on the growth and acid protease production ofH. lutea 72 in submerged cultivation in flasks was investigated. An improved medium was devised for future studies. The optimal aeration rate, inoculum level and cultivation time were determined. A maximal proteolytic activity of 670 μg tyrosine liberated from casein ml−1 culture filtrate min−1 at pH 3.0 was obtained.
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