KROK 2 Pharmacy

Practice session

A quality control pharmacist differentiates between hydrolyzable tannins (gallotannins in oak bark, Cortex Quercus) and condensed tannins (catechin derivatives in tormentil rhizomes, Rhizoma Tormentillae). What diagnostic color reaction with ferric ammonium alum (or ferric chloride) distinguishes these two classes of tannins?

Loading your practice session…