A three-step approach to assess efficacy of alternative chemical treatments to preserve fresh fruit juices: Application to pineapple (Ananas comosus 'Queen Victoria')

Leneveu-Jenvrin Charlène, Aboudia Aouatif, Assemat Sophie, Remize Fabienne. 2022. A three-step approach to assess efficacy of alternative chemical treatments to preserve fresh fruit juices: Application to pineapple (Ananas comosus 'Queen Victoria'). LWT - Food Science and Technology, 155:112959, 8 p.

https://doi.org/10.1016/j.lwt.2021.112959

Article de revue ; Article de recherche ; Article de revue à facteur d'impact

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Résumé : Fresh pineapple juice exhibits a shelflife of a few days limited by the development of yeasts and molds. An approach was implemented to assess the efficacy of treatments of juice, based on three successive steps. The first step was to validate the use of a microbial cocktail which leads to juice spoilage. In a second step, the efficacy of treatments was assessed on the growth of fungi in two conditions. The treatment chosen was the addition of Thymus leptobotrys (Tl) and Thymus maroccanus (Tm) essential oils (EO). These extracts were mainly composed of the monoterpene carvacrol, and inhibited fungal growth in culture medium. The addition of EO to pasteurized juice inoculated with a fungal cocktail limited fungal population below 4.6 log CFU/mL during 14 days. The low pH of pineapple juice probably strengthened the effect of antifungal compounds acting on proton gradient across plasma membrane. Lastly, the efficacy of the treatments was assessed in fresh pineapple juice harboring its natural microbial population. The extracts TlEO at 0.25‰ or TmEO at 0.05‰ limited fungal growth below 5 log CFU/mL during 14 days. Thyme scent was detected after EO addition but the characteristic descriptors of pineapple and sugary were maintained.

Mots-clés Agrovoc : jus de fruits, Ananas comosus, thym, propriété physicochimique, huile essentielle, jus d'ananas, levure, propriété antifongique

Mots-clés géographiques Agrovoc : Maroc, La Réunion

Mots-clés libres : Shelflife, Carvacrol, Thymol, Antifungal properties

Agences de financement européennes : European Regional Development Fund, European Commission

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