Discussion The results obtained with the fruit peel are contradictory to the generally accepted idea that hesperidin is contained in the fruit peels of the bitter orange. They are in sharp contrast to the report of Kolle and Gloppe who observed the presence of both neohesperidin and hesperidin in immature orange fruit peels.. Whether or not neohesperidin plus hesperidin are really present in immature fruits and naringin and rhoifolin appear in ...