Spanish oranges (Citrus sinensis (L.) Osbeck) of the cv. Navelina
and cv. Valencia late were purchased at a local supermarket (Dunnes
Stores, North Earl Street, Dublin. Ireland) stored unwrapped and in
bulk. Oranges with less than 75 mm or more than 90 mm of diameter
were discarded. The oranges were brought to the laboratory and
stored at 4 °C until processing.