Synthetic phylloquinone was resolved into cis and trans isomers by thin-layer chromatography. The two isomers had identical ultraviolet spectra characteristic of vitamin K$_{1}$ and were ...

Holtkamp, D. E., Greslin, J. G., Root, C. A., and Lerner, L. J., Proc. Soc. Exp. Biol. N.Y., 105, 197 (1960).

β-Carotene is generally regarded as the most commercially important and widely utilized carotenoid. It is used as a food coloring agent, an antioxidant, and an important and safe provitamin A source.