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Abstract The structures of two quinoline alkaloids, edulitine and edulinine, constituents of Casimiroa edulis , have been established by NMR and mass spectrometry.
(±)-3-Hydroxy-β-ionone has been prepared and converted into zeaxanthin, β-cryptoxanthin, and zeinoxanthin (α-cryptoxanthin).
The mass spectra of a number of aromatic nitro-compounds in which peri- and ortho-effects have an opportunity to operate have been determined. Interpretation of the spectra has been aided by… (More)
Three pigments from sea urchins have been identified as fucoxanthin (II), fucoxanthinol (I), and a novel allenic ketone (V), ‘paracentrone.’
Abstract The fungus W. sebi produces a series of unique pyrrolylpolyene pigments (1)–(4). Some of the important fragmentation processes in their mass spectra are discussed, and related to those… (More)
Four carotenoids isolated from diphenylamine-inhibited cultures of Rhodospirillum rubrum have been identified by light absorption spectroscopy and mass spectrometry as 7,8,11,12-tetrahydrolycopene… (More)