Contributions to the Stereochemistry of Cryptoxanthin and Zeaxanthin

Citation

Lemmon, Richard Millington (1943) Contributions to the Stereochemistry of Cryptoxanthin and Zeaxanthin. Master's thesis, California Institute of Technology. doi:10.7907/bbt8-2m16. https://resolver.caltech.edu/CaltechTHESIS:03062024-211843082

Abstract

[Summary]

1. The stereoisomerization of cryptoxanthin was studied under the influence of iodine catalysis at room temperature, melting the crystals, refluxing and irradiation. Two new stereoisomers of cryptoxanthin were detected, one of which, neo-cryptoxanthin U, is adsorbed above all-trans-cryptoxanthin on the Tswett column.

2. Molecular extinction curves were taken in the region from 320 to 380 mµ. for all-trans-cryptoxanthin, three of its stereoisomers, and the cryptoxanthin iodine-catalyzed equilibrium mixture of stereoisomers.

3. The stereoisomerization of zeaxanthin was studied under the influence of melting the crystals, refluxing and irradiation. Three new stereoisomers of zeaxanthin were detected, two of which appear below all-trans- zeaxanthin on the Tswett column.

Thesis Files