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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 Shama,  
 

Spectrophotometric determination of phenylephrine HCl and orphenadrine citrate in pure and in dosage forms.

A simple and rapid spectrophotometric methods have been estimated for the microdetermination of phenylephrine HCl (I) and orphenadrine citrate (II). The proposed methods are based on the formation of ion-pair complexes between the examined drugs with alizarine (Aliz), alizarine red S ( ARS), alizarine yellow G (AYG) or quinalizarine (Qaliz), which can be measured at the optimum lambda(max). The optimization of the reaction conditions is investigated. Beer's law is obeyed in the concentration ranges 2-36 microgram ml(-1), whereas optimum concentration as adopted from Ringbom plots was 3.5-33 microgram ml(-1). The molar absorptivity, Sandell sensitivity, and detection limit are also calculated. The correlation coefficient was >/=0.9988 (n=6) with a relative standard deviation of </=1.7, for six determinations of 20 microgram ml(-1). The proposed methods are successfully applied to the determination of drugs I and II in their dosage forms using the standard addition technique.[1]

References

  1. Spectrophotometric determination of phenylephrine HCl and orphenadrine citrate in pure and in dosage forms. Shama, S.A. Journal of pharmaceutical and biomedical analysis. (2002) [Pubmed]
 
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