Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/9521
Title: Indirect spectrophotometric determination of some biologically important phenothiazines using potassium dichromate, iron(II) and 1,10-phenanthroline
Authors: Basavaiah, K
Keywords: Iron(II)
orthophenanthroline
phenothiazine determination
potassium dichromate
Issue Date: Sep-2004
Publisher: CSIR
Series/Report no.: C07 D 279/00, G01 J 3/00
Abstract: A sensitive method is presented for the spectrophotometric determination of phenothiazine derivatives of biological importance. The drugs namely, chlorpromazine hydrochloride (CPH), promethazine hydrochloride (PH), trifluoperazine hydrochloride (TFPH), prochlorperazine maleate (PCPM) and fluphenazine hydrochloride (FPH) are reacted with a fixed amount of dichromate in acidic conditions. After the reaction is complete, the unreacted dichromate is determined by treating with iron(II) and <i style="">ortho</i>-phenanthroline at a raised pH and measuring the absorbance at 510 nm. The amount of dichromate reacted corresponds to the drug content. The linearity ranges are found to be 5-30, 2.5-25, 5-45, 7.5-60 and 5-50 <img src='/image/spc_char/micro.gif' border=0>g mL<sup>-1</sup> for CPH, PH, TFPH, PCPM and FPH, respectively. The apparent molar absorptivity values are in the range 3.46<img src='/image/spc_char/cross.gif' border=0>10<sup>3</sup>-6.47<img src='/image/spc_char/cross.gif' border=0>10<sup>3 </sup>L mol<sup>-1</sup> cm<sup>-1</sup> and the limits of determination range from 0.49 to 1.87 <img src='/image/spc_char/micro.gif' border=0>g mL<sup>-1</sup> and the relative standard deviation is less than 2%. The proposed method has been applied for the determination of these drugs in pure form and in pharmaceutical formulations with recoveries in the range 96.28-103.24%. The method was further validated by parallel determination by the official British Pharmacopoeial procedure and by recovery studies.
Description: 632-638
URI: http://hdl.handle.net/123456789/9521
ISSN: 0975-0991 (Online); 0971-457X (Print)
Appears in Collections:IJCT Vol.11(5) [September 2004]

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