Studying and modelling the combined effect of temperature and water activity on the growth rate of P. expansum

Lahlali, Rachid; Serrhini, M. N.; Jijakli, M. Haïssam

doi:10.1016/j.ijfoodmicro.2005.02.002

Cited by 75 publications

(52 citation statements)

References 17 publications

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“…The results in Table 1 revealed significant effect of each single factor and interaction. These results are in agreement with those reported by Lahlali et al (2005) for the radial growth rate of P. expansum on similarly modified Potato Dextrose Agar medium. Teixidõ et al (1998) have observed similar effects on the growth rate of Candida sake in nutrient yeast dextrose broth.…”

Section: Influence Of a W Temperature And Solutesupporting

confidence: 93%

“…(6)) and our statistical and graphical analyses confirm the previous findings that the a w has a greater effect than temperature on radial fungal growth under in vitro conditions (Sautour et al, 2002;Samapundo et al, 2005;Lahlali et al, 2005Lahlali et al, , 2006. Haasum and Nielsen (1998) have likewise observed that the radial growth rate of B. cinerea is more affected by a w than temperature, confirming our particular data on the same fungus.…”

Section: Combined Effect Of a W And Temperaturesupporting

confidence: 89%

“…The choice of the solute used to modify the a w of the PDA medium has a significant impact on the growth rate of P. expansum (Lahlali et al, 2005). Abadias et al (2000) report similar results for the antagonistic yeast C. sake.…”

Section: Influence Of a W Temperature And Solutementioning

confidence: 79%

“…The average diameter of each growing mycelial colony was measured daily in two perpendicular directions (Marín et al, 1996;Lahlali et al, 2005) without opening the Petri dishes.…”

Section: Growth Measurementmentioning

confidence: 99%

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Predictive modelling of temperature and water activity (solutes) on the in vitro radial growth of Botrytis cinerea Pers

Lahlali

Serrhini

Friel

et al. 2007

International Journal of Food Microbiology

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The objective of this work was to develop validated models predicting the 'in vitro' effect of a w and temperature on the radial growth of Botrytis cinerea. The growth rate (g, mm d− 1 ) of B. cinerea was calculated at three incubation temperatures (25°C, 15°C, 5°C) and six water activities (ranging from 0.995 to 0.890). The water activity was adjusted with glucose, NaCl, glycerol, or sorbitol. Statistical analysis showed a significant effect of temperature, solute, a w , and their two-and three-way interactions on the growth rate. No growth was observed at a w = 0.93 in the presence of NaCl or at 0.89 in the presence of a non-ionic solute. The maximum colony growth rate decreased when the incubation temperature and water activity was lowered. Secondary models, relating the colony growth rate with a w or a w and temperature were developed. Optimum a w values for growth ranged from 0.981 to 0.987 in glycerol-, sorbitol-, or glucose-modified medium and were close to 1 in NaClmodified medium. A quadratic polynomial equation was used to describe the combined effects of temperature and a w on g (mm d − 1 ) in the presence of each solute. The highest and lowest radial growth rates were observed in models based on glucose and NaCl respectively, whatever the incubation temperature. All models prove to be good predictors of the growth rates of B. cinerea within the limits of experiments. The quadratic polynomial equation has bias factors of 0.957, 1.036, 0.950, and 0.860 and accuracy factors of 1.089, 1.070, 1.120 and 1.260 in media supplemented with glucose, NaCl, glycerol and sorbitol respectively. The results from modelling confirm the general finding that a w has a greater influence on fungal growth than temperature.

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Section: Influence Of a W Temperature And Solutesupporting

confidence: 93%

Section: Combined Effect Of a W And Temperaturesupporting

confidence: 89%

Section: Influence Of a W Temperature And Solutementioning

confidence: 79%

“…The average diameter of each growing mycelial colony was measured daily in two perpendicular directions (Marín et al, 1996;Lahlali et al, 2005) without opening the Petri dishes.…”

Section: Growth Measurementmentioning

confidence: 99%

See 2 more Smart Citations

Predictive modelling of temperature and water activity (solutes) on the in vitro radial growth of Botrytis cinerea Pers

Lahlali

Serrhini

Friel

et al. 2007

International Journal of Food Microbiology

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“…Models based on multi-factor analyses like those described here are valid only for the specific strain/substrate combination studied and within the experimental domain (Delignette-Muller, 1997; Lahlali et al, 2005bLahlali et al, , 2007. Any extrapolation to other strains or growth substrates or beyond the tested ranges of the considered factors would be hazardous.…”

Section: Discussionmentioning

confidence: 99%

A Box-Behnken design for predicting the combined effects of relative humidity and temperature on antagonistic yeast population density at the surface of apples

Lahlali

Massart

Serrhini

et al. 2008

International Journal of Food Microbiology

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The objective of this work was to develop models predicting the combined effects of relative humidity (RH, 75-98%), temperature (5-25°C), and initial applied yeast concentration (10 4 -10 8 CFU/ml) on the apple-surface population densities of two biocontrol agents fused against postharvest diseases; the antagonistic yeasts Pichia anomala strain K and Candida oleophila strain O. Experiments were carried out according to a Box-Behnken matrix. Multiple regression analyses showed that both models yielded a good prediction of yeast density. The effect of relative humidity appeared greater than that of temperature. The number of yeast colony-forming units per square centimeter of apple fruit surface increased with increasing relative humidity, temperature, and initial applied yeast concentration. The models predict that under optimal growth conditions (25°C, 98%), strains O and K should reach a density of 10 4 CFU/cm 2 when applied initially at 2 × 10 7 (strain O) or 10 7 CFU/ml (strain K). The model results suggest that rainfall was likely the principal cause of the variability of yeast efficacy reported for previous preharvest orchard trials spanning two successive years. Temperature may also contribute to this variation. The models developed here are important tools for predicting population densities of both strains on the apple surface within the experimental limits. The use of these results should contribute to achieving yeast densities of 10 4 CFU/cm 2 on apples by controlling yeast application and environmental factors such as relative humidity and temperature. The results of this study also confirm our previous in vitro findings that water activity has a greater effect than temperature on yeast population density.

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A study on the physicochemical parameters for Penicillium expansum growth and patulin production: effect of temperature, pH, and water activity

Tannous

Atoui

Khoury

et al. 2015

Food Science & Nutrition

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Penicillium expansum is among the most ubiquitous fungi disseminated worldwide, that could threaten the fruit sector by secreting patulin, a toxic secondary metabolite. Nevertheless, we lack sufficient data regarding the growth and the toxigenesis conditions of this species. This work enables a clear differentiation between the favorable conditions to the P. expansum growth and those promising for patulin production. A mathematical model allowing the estimation of the P. expansum growth rate according to temperature, a W, and pH, was also developed. An optimal growth rate of 0.92 cm/day was predicted at 24°C with pH level of 5.1 and high a W level of 0.99. The model's predictive capability was tested successfully on artificial contaminated apples. This model could be exploited by apple growers and the industrialists of fruit juices in order to predict the development of P. expansum during storage and apple processing.

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Studying and modelling the combined effect of temperature and water activity on the growth rate of P. expansum

Cited by 75 publications

References 17 publications

Predictive modelling of temperature and water activity (solutes) on the in vitro radial growth of Botrytis cinerea Pers

Predictive modelling of temperature and water activity (solutes) on the in vitro radial growth of Botrytis cinerea Pers

A Box-Behnken design for predicting the combined effects of relative humidity and temperature on antagonistic yeast population density at the surface of apples

A study on the physicochemical parameters for Penicillium expansum growth and patulin production: effect of temperature, pH, and water activity

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