642 



VI. CAROTENOIDS AND RELATED COMPOUNDS 



300 



500 



40 



WAVE LENGTH IN MJLL 

 Fig. 21. Molecular extinction curves for cryptoxanthin in benzene: ( — -) fresh 

 solution of a\\-lrans compound ; (- -) mixture of stereoisomers after iodine catalysis 

 at room temperature in light. ^'^ 



300 



500 



400 

 WAVE LENGTH IN MJUL 



Fig. 22. Molecular extinction curves for zeaxanthin in benzene: ( — ) fresh solu- 

 tion of all-Zrons compound; (--) mixture of stereoisomers after iodine catalj^sis 

 at room temperature in light.*^^ 



