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Spectrophotometric Determination of Some Anti-Tussive and Anti-Spasmodic Drugs Through Ion-Pair Complex Formation With Thiocyanate and cobalt(II) or molybdenum(V)

Spectrophotometric Determination of Some Anti-Tussive and Anti-Spasmodic Drugs Through Ion-Pair Complex Formation With Thiocyanate and cobalt(II) or molybdenum(V)

Ragaa El-Shiekh, Faten Zahran, Ayman Abou El-Fetouh Gouda

Spectrochim Acta A Mol Biomol Spectrosc. 2007 Apr;66(4-5):1279-87.

PMID: 17142094

Abstract:

Two rapid, simple and sensitive extractive specrophotometric methods has been developed for the determination of anti-tussive drugs, e.g., dextromethorphan hydrobromide (DEX) and pipazethate hydrochloride (PiCl) and anti-spasmodic drugs, e.g., drotaverine hydrochloride (DvCl) and trimebutine maleate (TM) in bulk and in their pharmaceutical formulations. The proposed methods depend upon the reaction of cobalt(II)-thiocyanate (method A) and molybdenum(V)-thiocyanate ions (method B) with the cited drugs to form stable ion-pair complexes which extractable with an n-butnol-dichloromethane solvent mixture (3.5:6.5) and methylene chloride for methods A and B, respectively. The blue and orange red color complexes are determined either colorimetrically at lambdamax 625 nm (using method A) and 467 or 470 nm for (DEX and PiCl) or (DvCl and TM), respectively (using method B). The concentration range is 20-400 and 2.5-50 microg mL-1 for methods A and B, respectively. The proposed method was successfully applied for the determination of the studied drugs in pure and in pharmaceutical formulations applying the standard additions technique and the results obtained in good agreement well with those obtained by the official method.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP3017605	Cobalt(II) thiocyanate		3017-60-5	Price

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