Flow-injection spectrophotometric determination of dipyrone in pharmaceutical formulations using a solid-phase reactor with copper(II) phosphate

• Authors: Viviane Bonifácio , Orlando Filho , Luiz Marcolino-Júnior
• Languages of publication: EN

Abstracts

EN

In this work, a flow-injection spectrophotometric method for dipyrone determination in pharmaceutical formulations was developed. Dipyrone sample solutions were injected into a carrier stream of deionized water and the reaction was carried out in a solid-phase reactor (12 cm, 2.0 mm i.d.) packed with Cu3(PO4)2(s) entrapped in a matrix of polyester resin. The Cu(II) ions were released from the solid phase reactor by the formation of Cu(II)-(dipyrone)n complex. When the complex is released, it reacts with 0.02% m/v alizarin red S in deionized water to produce a Cu(VABO3)3 complex whose absorbance was monitored at 540 nm. The calibration graph was linear over the range 5.0×10−5–4.0×10−4 mol L−1 with a detection limit of 2.0×10−5 mol L−1 and relative standard deviation for 10 successive determinations of 1.5% (2.0×10−4 mol L−1 dipyrone solution). The calculated sample throughput was 60 h−1. The column was stable for at least 8 h of continuous use (500 injections) at 25°C. Pharmaceutical formulations were analyzed and the results from an official procedure measurement were compared with those from the proposed FIA method in order to validate the latter method. [...]

Keywords

EN

Dipyrone; Flow injection analysis; Copper(II) phosphate; Solid-phase reactor

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2013
• Volume: 11
• Issue: 11
• Pages: 1830-1836

Dates

published

1 - 11 - 2013

online

25 - 8 - 2013

Contributors

author

Viviane Bonifácio

• Departamento de Química, Universidade Federal do Paraná, CEP 81531-990, Curitiba - PR, Brazil

author

Orlando Filho

• Departamento de Química, Universidade Federal de São Carlos, CEP 13565-905, São Carlos - SP, Brazil

author

Luiz Marcolino-Júnior

• Departamento de Química, Universidade Federal do Paraná, CEP 81531-990, Curitiba - PR, Brazil

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Identifiers

DOI

10.2478/s11532-013-0312-6