Citrus‐Carotinoide. 1. Mitteilung. Synthese von Apocarotinoiden mit einer anders gelagerten Methylgruppe; Strukturaufklärung von Citrus‐Carotinoiden

Abstract

Synthesis of Apocarotenoides with a Shifted Methyl Group; Structure Elucidation of Citrus‐Carotenoides With regard to the investigation of the biosynthesis of the C30‐carotenoids in citrus fruits apocarotenoids with a methyl group shifted by one position (diapocarotenoids) were synthesized. Characteristical differences, especially in the 270‐MHz‐1H‐NMR. spectra between the apo‐ and the diapocarotenoids are reported. The comparison of the natural pigments with the synthetic compounds proves that the natural products belong to the apocarotenoids as has been postulated earlier.

Confirmation of the identity of the carotenoids of tropical fruits by HPLC-DAD and HPLC-MS

“…The latter authors Gross and Eckhardt (1981) also employed MS in the elucidation of the structures of three new carotenoids in apricot, peach, cranberry and plums. Other authors (Leuenberger and Stewart, 1976;Pfander et al, 1980;Farin et al, 1983) also used MS to study some carotenoids of orange.…”