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Microculture model studies on the effect of sorbic acid on Penicillium chrysogenum, Cladosporium cladosporioides and Ulocladium atrum at different pH levels
Author(s) -
Marie Skirdal Inger,
Eklund T.
Publication year - 1993
Publication title -
journal of applied bacteriology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.889
H-Index - 156
eISSN - 1365-2672
pISSN - 0021-8847
DOI - 10.1111/j.1365-2672.1993.tb03014.x
Subject(s) - cladosporium cladosporioides , penicillium chrysogenum , sorbic acid , penicillium , minimum inhibitory concentration , candida albicans , chemistry , food science , biology , microbiology and biotechnology , botany , antimicrobial
The minimum growth‐inhibitory concentration of sorbic acid has been determined for Penicillium chrysogenum, Cladosporium cladosporioides and Ulocladium atrum at pH 4·1–7·6 by using a microculture technique. This technique had earlier been applied to bacteria and Candida albicans and gave very reliable minimum inhibitory values. This investigation has shown that it is suitable also for determination of mould growth. The minimum inhibitory concentrations of sorbic acid were at the tested pH levels 1–230 mmol 1 ‐1 for P. chrysogenum, 0·3–18·0 mmol 1 ‐1 for C. cladosporioides and 0·2–33·0 mmol 1 ‐1 for U. atrum. A mathematical model for combined inhibition by dissociated and undissociated acid, which gave a good description of the minimum inhibitory concentration data earlier obtained for bacteria and Candida albicans, was suitable also for moulds. Both dissociated and undissociated acid contributed to growth inhibition.