To date, only a few papers have been reported on determination of carvedilol using spectrophotometry [42], chemiluminescence [43] and spectroflurimetry [44e47], in all of which carvedilol was determined only in pharmaceutical dosage forms and tablets.
In this study, a new approach was developed for the first time in which a poly acrylate-ethylene glycol (PA-EG) thin film was prepared
. Application of methyl methacrylate (MMA) as the monomer and ethyleneglycol dimethacrylate (EGDMA) as cross-linker donates more polar characteristic to the coating, hence the possibility to extract compounds with low Ko/w.
Effect of different contents of monomer and cross-linker on the mechanical property and solvent resistance of the prepared thin films were investigated.
Consequently, the developed thin film was used as a sorbent phase to extract carvedilol from human plasma without the need for protein precipitation step.
The extracted carvedilol was directly determined on the surface of the thin film using solid-state spectrofluorimetry, without performing desorption step and solvent evaporation prior to determination.
Effect of different extraction conditions on the extraction efficiency of carvedilol was studied in detail.
Our proposed method is simpler, faster and more economical compared to the chromatographic methods, in which selectivity and simplicity of spectrofluorimetry are coupled with sensitivity of the matrix interference-free method of thin-film sorptive extraction