PROPERTIES OF THE CAROTENOIDS 



G41 



400 

 LENGTH 



500 



WAVE LENGTH IN M^ 



Fig. 19. Molecular extinction curves for 7-carotene in hexane: ( — ) fresh solu- 

 tion of &\\-trans compound; (- -) mixture of stereoisomers after refluxing in dark 

 for 45 minutes; (-•-) mixture of stereoisomers after iodine catalysis at room tem- 

 perature in light. ^■*2 



300 400 500 



WAVE LENGTH IN M U 



Fig. 20. Molecular extinction curves for lycopene in hexane: ( — ) fresh solu- 

 tion of all-/ra«s compound; (- -) mixture of stereoisomers after iodine catalysis at 

 room temperature in light.^*^ 



