LIGHT ABSORPTION CURVES OF SOME CAROTENOIDS 351 

 logEut 



3.0 



2.5 



2.0 



1.6 



270 300 



350 



400 



450 



500 — -A in ma 



Fig. 9. 



Violaxanthin in ethanol; Fucoxanthin in hexane* 



Helv. chim. Acta 26 (1943) 117 





3.0 



2.5 



250 



350 



400 



■ X in mil 



Fig. 10. Auroxanthin in ethanol 

 Helv. chim Acta 25 (1942) 1624 



* E is the extinction, one per cent, one centimetre, given by E '° ^ ijcl x log (lo/I). 



where I^ and I are the intensities of the incident and transmitted light, respectively, c=^ 

 concentration in gms/ioo ml, and /==cell length in cms. 



