Conductimetric titration of phenolic groups in phlobaphene, tannin and model compounds in waterorganic solvents were investigated. The solvents used were water, watermethanol (3 + 2) and waterdimethyl sulphoxide (1 + 1). The most satisfactory results were obtained in the last mixture. The values obtained were as follows: 1.0LOH groups in catech@, 1.62 OH, groups in resorcinol and 3.64 OH groups in catechin. For phlobaphene (Mn 6500) and tannin (M, 2600) the phenolic contents found were 53.5 and 23.0 per mole, respectively.
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