Quality of ‘Delta Valencia’ orange grown in semiarid climate and stored under refrigeration after coating with wax
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Sociedade Brasileira de Ciência e Tecnologia de Alimentos
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The effects of carnauba-based wax on the quality of ‘Delta Valencia’ orange produced in Ceará state, Brazil, were studied. Thefruits were coated with carnauba-based wax and refrigerated (7 ± 2 °C and 85 ± 2% R.H.) for 28 days. The quality attributeparameters assessed were weight loss, peel color (brightness, hue angle, and chromaticity), peel moisture, pH, soluble solids(SS), titratable acidity (TA), SS/TA ratio, ascorbic acid, total soluble sugars, reducing sugars, yellow flavonoids, and polyphenols.The results showed that ‘Delta Valencia’ oranges grown in the dry climate of Ceará state has excellent quality. The coated fruitslost mass at a lower rate than the the control fruits. No significant loss of soluble solids, titratable acidity, pH, and SS/TA ratiowas observed, while ascorbic acid, soluble sugars, reducing sugars, yellow flavonoids, and polyphenols increased during storagein both the coated and control fruits. Carnauba-based wax coated fruits showed no signal of dehydration keeping their shinygreen peel up to the end of the storage. The use of coating was crucial for the maintenance of visual quality by reducing massloss, as well as keeping peel moisture.
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