36o LIGHT ABSORPTION CURVES OF SOME CAROTENOIDS 



log E urn 

 3.6 



3.1 



2.6 



2.1 



250 300 350 400 450 500 



^Xmma 



Fig. 29. 



^-Apo-2-Carotenal; - - - - Carotenone, in hexane 

 Helv. chim. Acta 26 (1943) 119 



>°S^Um 



500 



Fig. 30. Dihydro-;S-carotene in hexane 

 Helv. chim. Acta 23 (1940) 958 



