Modeling Botrytis Cinerea Spores Growth in Carbon Dioxide Enriched Atmospheres

Journal of Food Science (Impact Factor: 1.7). 07/2006; 67(5):1904 - 1907. DOI: 10.1111/j.1365-2621.2002.tb08744.x


This study simulates the conditions in which Botrytis may appear in a modified atmosphere packed horticulture product, such as strawberry, so as to elaborate a predictive model that could allow us to estimate the shelf-life of a contaminated food product in such atmosphere conditions (0 to 40% CO2). The estimated shelf-lives obtained at 18 °C were 92, 164, and 236 h in storage atmospheres of 0, 10, and 20% CO2, respectively, very close to observed values; no growth was observed above 30% CO2. The elaborated predictive model allows us to: (a) control development of this fungi if the food product is maintained in an atmosphere containing more than 20% CO2 and (b) predict the time taken for potential colonies to become visible (3 mm dia) and, thus, cause immediate rejection by consumers.

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    ABSTRACT: Mould growth was modelled on fermented bakery product analogues (FBPA) of two different pH (4.5 and 5.5), different water activity (a(w)) levels (0.80-0.90) and potassium sorbate concentrations (0-0.3%) by using seven moulds commonly causing spoilage of bakery products (Eurotium spp., Aspergillus spp. and Penicillium corylophilum). For the description of fungal growth (growth rates) as a function of a(w), potassium sorbate concentration and pH, 10-terms polynomial models were developed. Modelling enables prediction of spoilage during storage as a function of the factors affecting fungal growth. At pH 4.5 the concentration of potassium sorbate could be reduced to some extent only at low levels of a(w), whereas at pH 5.5 fungal growth was observed even by adding 0.3% of potassium sorbate. However, this preservative could be a valuable alternative as antifungal in such bakery product, of slightly acidic pH, if a long shelf life has not to be achieved.
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    ABSTRACT: The effect of reduced O2 and elevated CO2 modified atmospheres (MAP) and abuse temperature (15 °C) on the growth of Penicillium aurantiogriseum were evaluated. Measured colony diameter growth curves are fitted to estimate the growth rate (μ) and lag phase (L) of the fungus. The colony growth rate was modelled by Baranyi and Roberts (Int. J. Food Microbiol. 23 (1994) 277) function. A good correlation between the experimental data and the model prediction was obtained, the regression coefficients (r2) were 0.99. P. aurantiogriseum grew in atmospheres containing 30% and 50% CO2, but the growth rate decreased and lag phase increased compared with growth in air. No fungal growth was observed for up to 550 h of incubation at 15 °C when samples were packaged in atmospheres with CO2 concentrations higher than 70%.The growth rate and lag phase was modelled as function of CO2 concentrations using a polynomial model equation. The estimations of growth rate and lag phase were in excellent agreement to the experimental results (R2=98.5; RMSE=0.01; P<0.01). The time to reach a colony diameter of 3 mm was also calculated.
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