AGROBIOLOGIA
Volume 9, Numéro 2, Pages 1528-1542
2019-12-30

Characterization Of Postharvest Physiology Of Thermised Dates (phoenix Dactylifera L.), Packed Under A Modified Atmosphere (map).



Authors : Marouf Aribi Mohamed . Khali Mustapha .

Abstract

Description of the subject: The quality of the fruit is largely determined by growing conditions, a link must be made between this initial quality, linked to the agronomic conditions, and the preservation of this quality, linked to the harvest and the techniques of conservation or maturation applied thereafter. This study therefore focuses on the physiological characterization of the date stored under MAP after harvest and in the course of conservation. Objective: The effect of PET packaging on the postharvest physiology of Deglet-Nour Dates (Phoenix dactylifera L.) during storage was studied under different storage conditions (22°C ±1°C and 75-80% RH, 10°C ±2°C and 85-90% RH). Methods: The experimental setup consists of a box with internal dimensions of 7.5×15.00×7.5 cm. It is made of PET film thickness 0.0025 mm. The modified atmosphere inside the box is generated by the exchange between the product and the outside through the film. The dates are packaged in batches of 350g ±5g. The date samples were divided into two groups of batches with six samples each, corresponding to the storage period (0, 1, 2, 3, 4 and 5 months) before to be tested for the first at room temperature (22°C ±1°C) with a relative humidity of 75% to 80% and the second at low temperature of 10°C ±2°C with a relative humidity of 85 % to 90%. Results: We found that PET packaging to limit respiratory intensity during storage. The O2 and CO2 concentration of the samples stored under PET (at 22°C ±1°C) after harvesting at the Tamar stage experienced a sharp decrease in oxygen (from 20.25% to 12.86%). Likewise, the PET film packaging limited the degassed CO2 concentration after seven hours of storage compared to the control sample. After harvest, dates showed a typical respiration of non-climacteric fruit (less than 5 mmoles O2 kg-1.h-1) and low ethylene production thus with very low metabolic activities. Conclusion: The combination of thermization-packaging and cold storage (10°C ±2°C) is a storage method that ensures an optimal physiological criterion for dates by limiting their respiratory activity. Deglet-Nour dates so packaged in PET packaging, pre feel excellent storage ability beyond the five months tested.

Keywords

Activité respiratoire, Cold storage, Conservation au froid, Film PET, PET packaging, Post-harvest, Poste récolte, Respiratory activity, Thermisation, Thermization

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