Citrus peel is also known to be rich in polyphenolic
compounds, with the majority (96%) of citrus fruits in
major citrus producing countries (Brazil and the United
States) converted into juice. Since the juice yield is about
half of the fruit weight, very large amounts of citrus peel
are generated as a by-product of the juice industry
(Bocco et al., 1998). In the case of Korea, about
40,000 tons of citrus peel by-products, out of 150,000
tons of citrus peels have been produced yearly in citrus
juice processing (Jeju Provincial Development Co.,
2003).