TY - JOUR
TI - 2,2′:6′,2″-Terpyridine[hydroxypropyl-β-cyclodextr in] 1:3 complex used as chelating agent for the determination of iron with a sensitive, selective and fast liquid chromatographic method
AU - Mytides, P.
AU - Rozou, S.
AU - Benaki, D.
AU - Antoniadou-Vyza, E.
JO - Analytica Chimica Acta
PY - 2006
VL - 566
TODO - 1
SP - 122-129
PB - 
SN - 0003-2670
TODO - 10.1016/j.aca.2006.02.067
TODO - Absorption;  Chelation;  Drug products;  Iron;  Liquid chromatography;  Nuclear magnetic resonance;  Positive ions;  Supramolecular chemistry, 2,2′:6′,2″-Terpyridine;  Chelate agent;  Cyclodextrin complex, Organic compounds, 2 hydroxypropyl beta cyclodextrin;  2,2':6',2'' terpyridine[hydroxypropyl beta cyclodextrin] 1:3 complex;  beta cyclodextrin derivative;  chelating agent;  cobalt;  cupric ion;  ferric ion;  ferrous ion;  nickel;  pyridine derivative;  reagent;  unclassified drug;  water, article;  chelation;  complex formation;  drug determination;  drug formulation;  liquid chromatography;  measurement;  priority journal;  quantitative analysis;  stoichiometry
TODO - In the present work, 2,2′:6′,2″-Terpyridine (terpy), a substance with very poor aqueous solubility, was dissolved in water, after formation of its inclusion complex with hydroxypropyl-β-cyclodextrin (HPβCD), in a 1:3 stoichiometry. The obtained [terpy:(HPβCD)3] supramolecule, with enhanced aqueous solubility, enables its usage as a reagent at RP-LC methods. It was found that, terpy after inclusion complexation retains unaffected the ability of binding to Fe2+. It was also observed that, the stable, reddish-purple [Fe(terpy)]2+ complex was formed quantitatively in a wide pH range (2-9). Subsequently, iron as active substance or impurity in a drug product, can be determined through UV-vis measurements of [Fe(terpy)2]2+. Speed, sensitivity and selectivity are the most important features of the isocratic RP-LC method, developed to determine iron in pharmaceutical formulations. The duration of the chromatographic separation was less than 4.0 min. The method was linear, precise and accurate from 0.17 to 2.2 mg l-1 of iron and the detection limit was found to be 5 μg l-1. The absorbance at 318 and 552 nm allowed the quantitation of Fe (II) and Fe (III) after reduction, as well as of total Fe (II + III). Moreover, there were no interferences from Fe3+, Ni2+, Co2+ or Cu2+. © 2006 Elsevier B.V. All rights reserved.
ER -