Document Type : Original Article
Authors
1 Department of Biotechnology, Laboratory for the Protection and Valorisation of Agrobiological Resources, Faculty of Nature and Life Sciences, University of Blida 1, B.P 270 Road of Soumâa-Blida, Algeria
2 Biotechnolgy laboratory, Higher National School of Biotechnology Taoufik Khaznadar, Nouveau Pôle Universitie Ali Mendjeli, BP. E66, Constantine, 25100, Algeria
Abstract
Purpose: This study provides a comprehensive evaluation of four heat treatment protocols, 45°C for 30 minutes, 50°C for 25 minutes, 55°C for 20 minutes, and 60 °C for 10 minutes, for the disinfestation of Deglet Nour dates (Phoenix dactylifera L.) while ensuring postharvest quality preservation and consumer acceptability. Research Method: The effectiveness of these heat treatments was assessed in terms of larval and egg mortality, physicochemical parameters (moisture, pH), sensory quality (texture, color, flavor, aroma), and microbiological stability, with additional storage trials using passive Modified Atmosphere Packaging (pMAP) based on PET film at 10±1°C for 5 months. Findings: Higher-temperature and shorter-duration heat treatments (notably 55°C/20 min and 60°C/10 min) proved most effective for insect disinfestation, with the 55°C/20 min treatment achieving 88.40% larval mortality while preserving the sensory qualities of the dates. Most treatments led to a noticeable reduction in moisture content, potentially affecting shelf-life and texture, except for the lowest temperature protocol. The 55°C/20 min treatment offered the best pH stability, which is key for preventing enzymatic and microbial degradation. When combined with passive Modified Atmosphere Packaging (pMAP) using PET film, this protocol ensured long-term preservation by maintaining both the physical quality and microbiological safety of the dates during cold storage. Research limitations: Further research could explore its applicability to other date varieties and dried fruits under different storage conditions. Originality/Value: This method provides a non-chemical, scientifically validated disinfestation solution, reducing reliance on fumigants and pesticides while ensuring product safety and marketability.
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Main Subjects
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