Limonoid and flavonoid composition in varieties of Papeda and Papedocitrus

The limonoids of the seeds and the flavonoids of the leaves of a number of species of the Citrus sub-genus Papeda were examined. The seeds contained only the normal citrus limonoids and did not contain ichangensin, the unique limonoid found in C. ichangensis. A flavonoid analysis showed that a number of papeda varieties including C. latipes and C. hystrix may be a papeda hybrid species. C. junos had flavanone neoheperidosides, which are also found in cultivars related to the pummelo. All papedas examined had rutin present, which is characteristic of cultivars related to the citron. Citrus ichangensis had the most complex flavone/flavonol pattern of all the papedas examined. This suggests that Citrus ichangensis may truly he a unique papeda species unlike that of the other papedas. Copyright (C) 1996 Elsevier Science Ltd