Articles

Physical treatment to preserve the bioactive compounds on ‘Deglet Noor’ palm

Article number
1194_122
Pages
867 – 872
Language
English
Abstract
Physical treatments as hot air treatment (HAT) could be a physical alternative to chemical treatments as methyl bromide which have harmful effects on the environment principally and indirectly on humans.
This chemical agent is used to remove the insect infestation caused by Ectomyelois ceratoniae (carob moth) both in field and storage.
The postharvest quality of ‘Deglet Noor’ date fruits treated under two different hot air treatments (55°C for 30 min and 60°C for 15 min) vs. untreated air (control) were studied during the storage for 45 days at 2°C followed by a retail period of 4 d at 23°C. The use of HATs was 100% effective, caused the mortality of E. ceratoniae and reduced mesophilic bacterial counts.
HATs did not affect the total phenolic content and antioxidant activity by FRAP assay, except in DPPH assay where the treatment at 60°C for 15 min reduced the antioxidant activity of date palm samples.
Storage time and the high temperature during the retail period had a significant impact, reducing antioxidant activity and total phenolic content of date fruits.
Nevertheless, the HATs applied are a suitable physical treatment for E. ceratoniae larvae mortality maintaining the marketability quality for 45 d at 2°C followed by a retail period of 4 d at 23°C.

Publication
Authors
R. Ben-Amor, M.D. de Miguel-Gómez, A. Martínez-Sánchez, E. Aguayo
Keywords
heat treatment, carob moth, date palm, antioxidant activity, total phenolic content
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