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Products: Almonds
Subject: Food Technology

Postharvest gas treatments for almonds: Efficacy, lipid oxidation and practical implications for quality preservation

Authors: Hashem, A. S., Khalil, F. M., Alharbi, J. S., Alajmi, A. J., Alharbi, H. M., Alwutayd, K. M., ... & Mahyoub, J. A.
  • Journals: Journal of Stored Products Research
  • Pages: 102969
  • Volume: 116
  • Year: 2026
Postharvest management of high-oil nuts such as almonds must reconcile disinfestation with preservation of lipid quality. Rigorous, life-stage–resolved comparisons that quantify both insect control and almond quality remain scarce. An integrated benchmark was conducted on shelled almonds infested with Tribolium castaneum (Herbst, 1797; Coleoptera: Tenebrionidae) and Oryzaephilus surinamensis (Linnaeus, 1758; Coleoptera: Silvanidae) (larvae and adults), evaluating three gaseous treatments: ozone (O3; 500 ppm, 6 h), phosphine (PH3; 1 g m−3, 7 d), and an ECO2Fume CO2-based treatment (50 g m−3, 3 d). Across five independent replicates, biological endpoints (mortality, fecundity, nutritional indices, energy conversion index, and almond weight loss) were quantified alongside a chemical quality panel (proteins, Thiobarbituric acid reactive substances, free fatty acids, proximate composition, minerals, total phenolics, oil). PH3 achieved the highest and most consistent mortality (≈89–99%) and markedly suppressed feeding and progeny while inducing only minor immediate changes in lipid-oxidation indices. The CO2-based treatment delivered comparable control (≈86–94%) with modest chemical shifts and pronounced reductions in consumption and weight loss. By contrast, O3 produced only moderate insecticidal effects (≈55–66% mortality) but caused clear oxidative deterioration (ΔPV = +2.31; ΔTBARS = +0.90; ΔFFA = +0.145; total phenolics ≈ −15.9%). Multivariate synthesis of Principal component analysis (PCA) and Canonical variate analysis (CVA) indicated that a primary axis dominated by oxidation markers explained ∼88% of treatment variance (Can1; P < 0.001), whereas a secondary axis captured insect-response variation (∼11%; Can2; P < 0.001). Findings delineate a practical trade-off between pest suppression and lipid-quality preservation and support prioritization of PH3 or CO2-based approaches over ozone for high-oil commodities unless oxidative impacts can be mitigated.

https://doi.org/10.1016/j.jspr.2026.102969