Electron beam radiation applied to portuguese chestnuts (Castanea sativa Mill.): evaluation of the effects on nutritional parameters
Notice bibliographique
Résumé
Chestnuts are a widely consumed nut around the world, being China the biggest producer. Portugal represents 4% of its worldwide production with a gross weight of 22105 tons of chestnut in 2010, and an income of 15 M€. The Trás-os-Montes region produces 75% on the nation’s chestnuts being one of its main economic resources. Storage of these nuts is an important step during processing to avoid rotting related to their relatively high metabolic activity. Until 2010 the most common treatment for post-harvest desinfestation was methyl bromide, a widely used fumigant which was banned in the European Union under the Montreal protocol due to its toxicity and deleterious effect on the environment [1]. Other treatments like temperature, high pressure blast, hot water dip and other fumigants still pose quite a few disadvantages [2]. Food irradiation processing has been introduced as a safe and environment friendly alternative for conservation, being used in several products such as meat, fish or fruits [3]. Previous studies of our research group showed that gamma radiation had no major negative effect on the nutritional value of chestnuts; in fact, storage time had a much bigger influence on the chestnut quality [4]. In the present study, we report the effect of another type of radiation post-harvest processing, electron beam, with doses of 0, 0.5, 1, 3 and 6 kGy in the nutritional value of chestnuts (ash, energy, fatty acids, sugars and tocopherols), stored at 4 ºC during 0, 30 and 60 days. The storage time seemed to reduce fat and energetic values but reported a tendency for higher values of dry matter. Regarding fatty acids, there was a higher detected quantity of C20:2 in non-irradiated samples, and four fatty acids were only detected in trace quantities. The levels of γ-tocopherol decreased during storage time but did not alter its quantity for all the radiation doses, in fact they seemed to be present in higher concentrations in the irradiated samples. Sucrose and total sugars were lower in non-irradiated samples and raffinose was only detected in irradiated samples. Electron beam irradiation seems to be a suitable methodology, since the effects on chemical and nutritional composition are very low, while storage time seems to be quite important in chestnut deterioration.
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Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,006 | 0,005 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,001 | 0,002 |
| Études des sciences et des technologies | 0,001 | 0,001 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,001 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».