Influence of water activity and temperature on the growth of Wallemia sebi: application of a predictive model

PATRIARCA, ANDREA; VAAMONDE, GRACIELA; FERNÁNDEZ PINTO, VIRGINIA; COMERIO, RICARDO

INTERNATIONAL JOURNAL OF FOOD MICROBIOLOGY

Elsevier

Año: 2001 vol. 68 p. 61 - 67

0168-1605

Germination and growth of Wallemia sebi were examined on media of aw adjusted with glycerol in the range 0.96-0.77, at 25ºC and 30ºC. The effect of temperature on the germination time was significant except between 0.95 and 0.88 aw. At low aw levels, as well as above 0.95, the increase of temperature produced an increment in the germination time. The minimum aw for germination was also affected by temperature, being lower at 25ºC (0.80 aw) than at 30ºC (0.82 aw). Radial growth rates at 25ºC were higher than at 30ºC. The optimum aw value for growth of W. sebi was 0.94 at both temperatures. The minimum aw for growth was higher than minimum for germination and was also dependent on temperature (0.84 at 25ºC and 0.86 at 30ºC). An empirical mathematical model was fitted to the measured growth data, providing a good approach to the description of the effect of aw on the radial growth rate for Wallemia sebi.