Modelling the effect of temperature, water activity and carbon dioxide on the growth of Aspergillus niger and Alternaria alternata isolated from fresh date fruit

Belbahi Amine, Leguérinel Ivan, Méot Jean-Michel, Loiseau Gérard, Madani Khodir, Bohuon Philippe. 2016. Modelling the effect of temperature, water activity and carbon dioxide on the growth of Aspergillus niger and Alternaria alternata isolated from fresh date fruit. Journal of Applied Microbiology, 121 (6) : 1685-1698.

Quartile : Q2, Sujet : BIOTECHNOLOGY & APPLIED MICROBIOLOGY / Quartile : Q3, Sujet : MICROBIOLOGY

Résumé : Aims: To quantify and model the combined effects of temperature (T) (10–40°C), water activity (aw) (0·993–0·818) and CO2 concentration (9·4–55·1%, v/v) on the growth rate of Aspergillus niger and Alternaria alternata that cause spoilage during the storage and packaging of dates. Methods and Results: The effects of environmental factors were studied using the γ-concept. Cardinal models were used to quantify the effect of studied environmental factors on the growth rates. Firstly, the cardinal parameters were estimated independently from experiments carried out on potato dextrose agar using a monofactorial design. Secondly, model performance evaluation was conducted on pasteurized date paste. The boundary between growth and no-growth was predicted using a deterministic approach. Aspergillus niger displayed a faster growth rate and higher tolerance to low aw than Al. alternata, which in turn proved more resistant to CO2 concentration. Minimal cardinal parameters of T and aw were lower than those reported in the literature. Conclusions: The combination of the aw and CO2 effects significantly affected As. niger and Al. alternata growth. The γ-concept model overestimated growth rates, however, it is optimistic and provides somewhat conservative predictions. Significance and Impact of the Study: The developed model provides a decision support tool for the choice of the date fruit conservation mode (refrigeration, drying, modified atmospheric packaging or their combination) using T, aw and CO2 as environmental factors.

Mots-clés Agrovoc : croissance, Alternaria alternata, taux de croissance, impact sur l'environnement, Aspergillus niger, facteur du milieu

Mots-clés géographiques Agrovoc : Niger

Classification Agris : H20 - Maladies des plantes
J11 - Manutention, transport, stockage et conservation des produits d'origine végétale
U10 - Informatique, mathématiques et statistiques

Champ stratégique Cirad : Axe 3 (2014-2018) - Alimentation durable

Auteurs et affiliations

• Belbahi Amine, Université de Bejaia (DZA)
• Leguérinel Ivan, Université de Brest (FRA)
• Méot Jean-Michel, CIRAD-PERSYST-UMR Qualisud (FRA)
• Loiseau Gérard, Montpellier SupAgro (FRA)
• Madani Khodir, Université de Bejaia (DZA)
• Bohuon Philippe, Montpellier SupAgro (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/583771/)

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