VI. Isolierung der beiden Komponenten 

 des Chlorophylls. 



i. Zur Geschichte der Methode 1 ). 



Stokes. 



G. G. Stokes hat entdeckt, daB das Chlorophyll aus zwei 

 Komponenten besteht. Seine Angabe, die im Jahre 1864 in der 

 inhaltsreichen Notiz 2 ) ,,On the supposed Identity of Biliverdin 

 with Chlorophyll, with remarks on the Constitution of Chlorophyll" 

 erschienen ist, lautet: 



,,I find the Chlorophyll of land-plants to be a mixture of four 

 substances, two green an two yellow, all possessing highly distinc- 

 tive optical properties. The green substances yield solutions ex- 

 hibiting a strong red fluorescence; the yellow substances do not. 

 The four stubstances are soluble in the same solvents, and three 

 of them are extremely easily decomposed by acids or even acid 

 salts, such as bisoxalate of potash; but by proper treatment each 

 may be obtained in a state of very approximate isolation, so far 

 at least as coloured substances are concerned." 



Die Untersuchung von Stokes bestand also in der spektro- 

 skopischen Unterscheidung der beiden Komponenten des Chloro- 

 phylls und der gelben Begleiter Carotin und Xanthophyll. Mit 



*) Ann. d. Chem. 390, 275 [1912]. 



a ) Proc. Roy. Soc. 13, 144 [1864]. Siehe auch Stokes' nachtragliche 

 Fuflnote im Neudruck der beruhmten Abhandlung vom Jahre 1852: ,,On 

 the Change of Refrangibility of Light", Mathematical and physical Papers, 

 Vol. Ill, S. 300, Cambridge 1901. 



