new spectrophotometric and fluorimetric methods for determination of fluoxetine in pharmaceutical formulations
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ID: 213447
2009
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Abstract
New simple and sensitive spectrophotometric and fluorimetric
methods have been developed and validated for the determination of
fluoxetine hydrochloride (FLX) in its pharmaceutical formulations.
The spectrophotometric method was based on the reaction of FLX
with 1,2-naphthoquinone-4-sulphonate (NQS) in an alkaline medium
(pH 11) to form an orange-colored product that was measured at 490
nm. The fluorimetric method was based on the reaction of FLX with
4-chloro-7-nitrobenzo-2-oxa-1,3-diazole (NBD-Cl) in an alkaline
medium (pH 8) to form a highly fluorescent product that was
measured at 545 nm after excitation at 490 nm. The variables
affecting the reactions of FLX with both NQS and NBD-Cl were
carefully studied and optimized. The kinetics of the reactions
were investigated, and the reaction mechanisms were presented.
Under the optimum reaction conditions, good linear relationships
were found between the readings and the concentrations of FLX in
the ranges of 0.3–6 and 0.035–0.5 μg mL−1 for the
spectrophotometric and fluorimetric methods, respectively. The
limits of detection were 0.1 and 0.01 μg mL−1 for the
spectrophotometric and fluorimetric methods, respectively. Both
methods were successfully applied to the determination of FLX in
its pharmaceutical formulations.
| Reference Key |
darwish2009internationalnew
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|---|---|
| Authors | ;Ibrahim A. Darwish;Sawsan M. Amer;Heba H. Abdine;Lama I. Al-Rayes |
| Journal | Pesticide biochemistry and physiology |
| Year | 2009 |
| DOI |
10.1155/2009/257306
|
| URL | |
| Keywords |
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