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Current Pharmaceutical Analysis

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ISSN (Print): 1573-4129
ISSN (Online): 1875-676X

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Research Article

Determination of Epsilon Aminocaproic Acid Based on Charge Transfer Complexation with p-Nitrophenlol by Spectrophotometry

Author(s): Fang Tian and Sheng-Yun Li*

Volume 17, Issue 5, 2021

Published on: 11 February, 2020

Page: [603 - 608] Pages: 6

DOI: 10.2174/1573412916666200211104811

Price: $65

Abstract

Introduction: Spectrophotometry was investigated for the determination of epsilon aminocaproic acid (EACA) with p-nitrophenol (PNP). The method was based on Charge Transfer (CT) complexation of this drug as n-electron donor with π-acceptor PNP.

Methods: The experiment indicated that CT complexation was carried out at room temperature for 10 minutes in dimethyl sulfoxide solvent. The spectrum obtained for EACA/PNP system showed the maximum absorption band at a wavelength of 425 nm. The stoichiometry of the CT complex was found to be a 1:1 ratio by Job’s method between the donor and the acceptor. Different variables affecting the complexation were carefully studied and optimized. At the optimum reaction conditions, Beer’s law was obeyed in a concentration limit of 1～6 μg mL-1. The relative standard deviation was less than 2.9%. The apparent molar absorptivity was determined to be 1.86×104 L mol-1cm-1 at 425 nm. The CT complexation was also confirmed by both FTIR and 1H NMR measurements.

Results: The thermodynamic properties and reaction mechanism of the CT complexation have been discussed.

Conclusion: The developed method could be applied successfully for the determination of the studied compound in its pharmaceutical dosage forms with good precision and accuracy compared to the official method comprising t- and F-tests.

Keywords: Charge transfer complexation, epsilon aminocaproic acid, spectrophotometry, p-nitrophenol, FTIR, NMR.

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