title: Ionization constants of catechols and catecholamines.
abstract: Catecholamines can appear in different charged states: as positive, negative and zwitterion and as zero-charged molecule. The microscopic ionization constants of ten catecholamines were determined spectrophotometrically. For each charged state the fraction of total catecholamine at pH = 7.85 was calculated from the microscopic ionization constants. Some attention is given to the interpretation of the differences between the fractions of corresponding charged states.
mesh_terms: D002395:Catecholamines; D002396:Catechols; D006863:Hydrogen-Ion Concentration
chemical_list: D002395:Catecholamines; D002396:Catechols