Tandem mass spectrometry for the structure characterization of novel or very rare seco-carotenoids isolated from the leaves of two cycads

✍ Scribed by Antonio Selva; Franco Cardini

• Publisher: John Wiley and Sons
• Year: 1993
• Tongue: English
• Weight: 226 KB
• Volume: 28
• Category: Article
• ISSN: 1076-5174
• DOI: 10.1002/oms.1210280517

✦ Synopsis

Ceratozamia is one of the ten genera still surviving of Cycads, a relict group of morphologically primitive gymnosperms, typical of the Mesozoic era. Two species under study, i.e. Ceratozamia kuesteriana and C. fuscoviridis, show a transitory red-brown coloration of the young leaflets, which is due to the presence in the photosynthetic tissue of a mixture of several ketocarotenoids. Three seco-carotenoids representing the major components of the mixture, i.e. the very rare semi-/?carotenone (1) and triphasiaxanthin (2) and the novel 5hydroxy-5,6-seco-/?,/?-caroten-6-one, which we now name ceratoxanthin (3) (Scheme l), have already been fully