title: Investigation of the pindolol-Fe(III) complex and its use in the spectrophotometric determination of pindolol in bulk drug and tablets.
abstract: It was found that pindolol reacts with Fe(III) chloride producing a green water soluble complex (1:1, v/v) with maximum absorbance at 635 nm. By applying the methods of Sommer and Job [Sommer et al., Folia, tomus XI, Chemia 7, 25, 1970] the conditional stability constant of the complex at pH = 1.70 +/- 0.02 was found to be log K' = 4.95 and the molar absorptivity of the complex to be 206 l mol-1 cm-1. Beer's law was obeyed up to a concentration of 220 mumol l-1 of pindolol. The recoveries were 98-101% (n = 7) and the detection limit was 5 micrograms ml-1. The described method was sufficiently simple, selective and sensitive to be suitable for the rapid and accurate determination of pindolol in tablets.
authors.affiliation: Institute of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Belgrade, Yugoslavia.
authors.forename: D
authors.initials: D
authors.lastname: Pećanac
authors.forename: D
authors.initials: D
authors.lastname: Radulović
authors.forename: L
authors.initials: L
authors.lastname: Zivanović
authors.forename: S
authors.initials: S
authors.lastname: Agatonović-Kustrin
mesh_terms: D005290:Ferric Compounds / Q000737:chemistry*; D010869:Pindolol / Q000032:analysis* / Q000737:chemistry; D012680:Sensitivity and Specificity; D013053:Spectrophotometry; D013607:Tablets / Q000032:analysis
chemical_list: D005290:Ferric Compounds; D013607:Tablets; D010869:Pindolol