3.2.4. Selectivity and specificity
The selectivity of the proposed method for the simultaneous
determination of the cited drugs was assessed through the analysis
of laboratory prepared synthetic mixtures. These were prepared in
order to contain a combination of the 5 drugs at different ratios
within their linearity ranges mentioned in Table 1. The recovered
concentration for each drug was further calculated from the corresponding
regression equation. As seen in Table 3, the acceptable values of the found concentration, percentage relative standard
deviation RSD% (62.75) and percentage relative error Er% (within
±2%) confirm the accuracy, precision and selectivity of the developed
method. In addition, it can be inferred that the proposed
method is adequately capable of resolving and simultaneously
quantifying the investigated drugs when present over a wide range
of ratios within solutions.