148 Miss Wheldale, On the nature of anthocyanin. 



Luteolin, CigHjoOe, is found in Reseda luteola and Genista 

 tinctoria. It is an isomer of fisetin and may be represented as : — 







OH 



OH 



OH CO 



On fusion with alkali, phloroglucin and protocatechuic acid are 

 formed. 



Myricetin, CigHmOg, is found in the bark of Myrica nagi, in the 

 leaves of Rhus coriaria and R. cotinus, R. metopium, Pistacia 

 lentiscus and others. It may be regarded as a hydroxyquercetin 

 containing a pyrogallol instead of a catechol nucleus : — 



OH 



.OH 



OH 



OH 



OH 



OH CO 



Hence on fusion with caustic alkali it gives gallic acid and 

 phloroglucin. 



Chrysin, Ci5Hio04, is found in buds of Populus sp. It is a 

 dihydroxy flavone : — 







OH 



r^C_> 



OH CO 



Apigenin, dgllioOg, occurs in the form of a glucoside — 'apiln' — 

 in the leaves, stem and fruit of Parsley, Apiinn petroselium. It 

 may be regarded as a hydroxy chrysin or trihydroxy flavone : — 



OH 



OH 



OH CO 



On fusion with caustic alkali, the decomposition products are 

 phloroglucin and parahydroxybenzoic acid. 



