The effects of waxing, irradiation doses and storage on phenolic compounds and colour of irradiated oranges were investigated. Mature oranges (Citrus sinensis (L) Osbeck var Maroc late) waxed or unwaxed were treated with 0, 1 or 2 kGy radiation and stored up to 9 weeks at 20 • C and 40-50% RH. Colour of the oranges, total phenols and flavones in the peel were measured. Phenolic compounds increased with irradiation dose and storage time. Hue angle, L * value and chroma of the orange colour were more affected by waxing and storage time than the irradiation treatment. Changes in the phenolic compounds were linked with changes in the redness and saturation of the orange colour. Irradiation stimulated synthesis of flavones; waxing controlled changes induced by irradiation. These results may aid in maintaining the quality and safety of oranges during storage.
The study evaluated the effects of waxing, irradiation dose and post-irradiation storage time on the essential oils in orange peel. Mature oranges (Maroc late) waxed or unwaxed were treated with 1 or 2 kGy radiation and stored for 9 weeks at 20 • C and 40-50% RH. Essential oils from the peel were extracted and analysed by GC. Results showed that D-limonene was significantly lower in waxed oranges; levels in samples treated with 2 kGy were higher than those in non-irradiated or treated with 1 kGy. Linalool, methyl anthranilate and 3,7-dimethyl-2,6-octadienal decreased as the dose increased. Levels of linalool increased with storage time but D-limonene was unaffected. These results may aid in guaranteeing the quality of orange essential oils during storage time.
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