Dr. Kelly et al., NMR, MS AND X-RAY CRYSTAL-STRUCTURE DETERMINATION OF THE BIXIN FAMILYOF APOCAROTENOIDS, Journal of chemical research. Synopses, (10), 1996, pp. 446
The assignment of the H-1 and C-13 NMR spectra of alpha-bixin, methyl
alpha-bixin, beta-bixin and methyl beta-bixin have been carried out us
ing a combination of one- and two-dimensional techniques; the FAB(+) m
ass spectra of all these bixins had the molecular ion and methyl tropy
lium as high abundance peaks; also, the structures of alpha-bixin and
methyl alpha-bixin have been confirmed by X-ray crystal structure dete
rminations.