Selective spray reagents for the identification and estimation of flavonoid compounds associated with condensed tannins

Five selective spray reagents provide information regarding the A and B phenolic nuclei and the heterocyclic ring of flavonoid compounds. This information coupled with RF values in two solvent systems, enables the tentative identification of a wide variety of flavonoid substances. Lindstedt's bis-diazotised benzidine reagent gives colour reactions which are highly indicative of variations in the distribution of phenolic hydroxyl groups. The...