Growth curves fitted Penicillium
digitatum were used to analyze the effect of temperature, pH and aw on their growth. To asses
observance of independent variable effects on all growth parameters (λ, latency time, μ, growth rate and ymax maximal growth) a slow growth strain of P.
digitatum was employed. Growth curves were obtained at different conditions
of temperature (10?C - 40?C), pH (3.0 - 7.0) and water activity (0.800 - 0.990)
and growth parameters were calculated by fitting of logistic model. Polynomial
models were made by linear regression and all terms (linear, quadratic and
interactive effects) were statistically significant (p < 0.001). All growth
parameters, including maximal growth were affected by environmental conditions;
pH effect was more important on maximal growth than that on lag time or growth
rate. In some aspects results and modeling behavior of P. digitatum, are very similar to modeling of bacterial growth.
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