1786 



CHEMISTRY OF CHLOROPLAST PIGMENTS 



CHAP. 37B 



J^ 



Fig. 37B.9. Model of the crystal struetiire of chlorophyllides (after Hanson] 



6. Nature of Chlorophyll c 



(Addendum to Chapter 15, section B3) 



The chemical nature of chlorophyll c was investigated for the first 

 time by Granick (1949). The absorption spectrum of this faintly green 

 pigment {cf. insert in Fig. 21.5C, p. 615) is quite similar to that of proto- 

 chlorophyll (Fig. 21.8). By analogy, it can be surmised that chlorophyll 

 c is a porphyrin and not a chlorin. Granick's tests indicated that chloro- 

 phyll c contahis magnesium (bound more strongly than in chlorophyll) 

 but no phytol. Positive phase test indicates the presence of the cyclopen- 

 tanone ring. 



7. Chemistry of Bacteriochlorophyll and Bacterioviridin 



(Addendum to Chapter 16, section A3) 



Holt and Jacobs (1954') found that bacteriochlorophyll is not as un- 

 stable as it has been described. A green oxidation product, which is easily 



