scholarly journals Spectrophotometric determination of diphenhydramine hydrochloride in pharmaceutical preparations and biological fluids via ion-pair formation

2010 ◽  
Vol 3 (4) ◽  
pp. 265-270 ◽  
Author(s):  
Akram M. El-Didamony ◽  
Moftah A. Moustafa
Keyword(s):  
Spectrophotometric Determination ◽  
Biological Fluids ◽  
Pharmaceutical Preparations ◽  
Ion Pair ◽  
Pair Formation ◽  
Ion Pair Formation ◽  
Diphenhydramine Hydrochloride

Rapid Colorimetric Assay of Trimethoprim and Sulfamethoxazole in Pharmaceuticals

1983 ◽  
Vol 66 (6) ◽  
pp. 1447-1449 ◽  
Author(s):  
Asis K Sanyal ◽  
Dinabandhu Laha
Keyword(s):  
Solvent Extraction ◽  
Colorimetric Assay ◽  
Pharmaceutical Preparations ◽  
Ion Pair ◽  
Pair Formation ◽  
Bromophenol Blue ◽  
Colorimetric Determination ◽  
Ion Pair Formation ◽  
Subsequent Measurement

Abstract A method is described for the direct colorimetric determination of trimethoprim and sulfamethoxazole in pharmaceutical preparations, without prior separation. Estimation of trimethoprim is based on its ion-pair formation with bromophenol blue and subsequent measurement of absorbance of the ionpair at 418 nm. Estimation of sulfamethoxazole is possible without removal of trimethoprim by solvent extraction.

Spectrophotometric determination of ciprofloxacin by ion pair formation

2012 ◽  
Vol 67 (7) ◽  
pp. 655-660 ◽  
Author(s):  
M. N. Patel ◽  
B. S. Bhatt ◽  
D. S. Gandhi ◽  
P. A. Dosi ◽  
P. A. Parmar
Keyword(s):  
Spectrophotometric Determination ◽  
Ion Pair ◽  
Pair Formation ◽  
Ion Pair Formation
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