Τίτλος:
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
Γλώσσες Τεκμηρίου:
Αγγλικά
Περίληψη:
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.
Συγγραφείς:
Mytides, P.
Rozou, S.
Benaki, D.
Antoniadou-Vyza, E.
Περιοδικό:
Analytica Chimica Acta
Λέξεις-κλειδιά:
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
DOI:
10.1016/j.aca.2006.02.067
