Effects of temperature, water activity, and syrup film composition on the growth of Wallemia sebi: development and assessment of a model predicting growth lags in syrup agar and crystalline sugar.

Applied and Environmental Microbiology
Jannik Vindeløv, Nils Arneborg

Abstract

We investigated the effects of temperature, water activity (a(w)), and syrup film composition on the CFU growth of Wallemia sebi in crystalline sugar. At a high a(w) (0.82) at both high (20 degrees C) and low (10 degrees C) temperatures, the CFU growth of W. sebi in both white and extrawhite sugar could be described using a modified Gompertz model. At a low a(w) (0.76), however, the modified Gompertz model could not be fitted to the CFU data obtained with the two sugars due to long CFU growth lags and low maximum specific CFU growth rates of W. sebi at 20 degrees C and due to the fact that growth did not occur at 10 degrees C. At an a(w) of 0.82, regardless of the temperature, the carrying capacity (i.e., the cell concentration at t = infinity) of extrawhite sugar was lower than that of white sugar. Together with the fact that the syrup film of extrawhite sugar contained less amino-nitrogen relative to other macronutrients than the syrup film of white sugar, these results suggest that CFU growth of W. sebi in extrawhite sugar may be nitrogen limited. We developed a secondary growth model which is able to predict colony growth lags of W. sebi on syrup agar as a function of temperature and a(w). The ability of this model to predi...Continue Reading

References

Nov 1, 1994·International Journal of Food Microbiology·A M GibsonT A Roberts
Nov 1, 1996·The Journal of Applied Bacteriology·T Ross
Jun 5, 1999·International Journal of Food Microbiology·L ValíkF Görner
Aug 12, 1999·International Journal of Food Microbiology·J BaranyiT Ross
Mar 15, 2001·International Journal of Food Microbiology·L Rosso, T P Robinson
Sep 8, 2001·International Journal of Food Microbiology·A PatriarcaR Comerio
Jun 1, 1990·Applied and Environmental Microbiology·M H ZwieteringK van 't Riet

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Citations

May 5, 2005·Applied and Environmental Microbiology·José Miguel PoncianoPaul Joyce
Nov 23, 2007·International Journal of Food Microbiology·Sonia MarínVicente Sanchis
Oct 20, 2009·Food Microbiology·Daiana GarciaSonia Marín

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