Abstract
Undesirable protease production by Aspergillus niger Aa-20 in submerged culture and solid-state culture was evaluated using different concentrations of tannic acid as sole carbon source in a model system designed for tannase production. Protease production was found to be dependent on the culture system used (submerged culture or solid-state culture) and on the initial tannic acid concentration. Expression of protease activity in submerged culture was higher (up to 10 times) than activity obtained in solid-state culture, using identical culture medium composition. In submerged culture, the lowest final protease activity (0.13 IU) was obtained with the highest tannic acid concentration, while in solid-state culture protease activity was not affected by changes in initial substrate concentration. Absence of detectable proteolytic activity in solid-state culture is related to high production of tannase enzyme. Hence, the use of solid-state culture for fungal enzyme production may allow for higher and more stable enzyme titers present in culture extracts.
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Aguilar, C.N., Favela-Torres, E., Vinegra-González, G. et al. Culture conditions dictate protease and tannase production in submerged and solid-state cultures of Aspergillus niger Aa-20. Appl Biochem Biotechnol 102, 407–414 (2002). https://doi.org/10.1385/ABAB:102-103:1-6:407
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DOI: https://doi.org/10.1385/ABAB:102-103:1-6:407