The recovery of strontium ranelate and aspartame was
estimated using different sample solutions spiked with known amounts
of analytes at three different levels (5.0; 15.0 and 30.0 μg mL−1).
Non-spiked samples were run in parallel. Tests were performed in
three replicates and the recovery was calculated using the following
equation: Recovery=[(C1 − C2) / C3] ∗ 100, where C1 is the concentration
of the analytes in the fortified sample; C2 is the concentration
of the analyte in the sample unfortified and C3 is the concentration of
analyte added to the spiked sample. Average recoveries between 85
and 111% were obtained and the results are shown in Table 3.
The absorption spectra of electrophoretic peaks of the sample were
monitorated simultaneously during the analysis of the pharmaceutical
sample without the addition of strontium ranelate and aspartame standards.
Identification of the strontium ranelate and aspartame peakswas
confirmed by wavelength of maximum absorption at 235 nm and
198 nm, respectively, which demonstrated the ability and selectivity
of the method to identify the analytes of interest in the pharmaceutical
formulation, even in the presence of other substances (maltodextrin
and mannitol) in the sample matrix.