Differential Electrolytic Potentiometric Determination of Some Amino Acids in Dosage Forms

Authors: Al-Ghannam, Sheikha M.¹; Abulkibash, Abdalla M.S.²; Al-Olyyan, Abeer M.³

Source: Journal of AOAC International, Volume 87, Number 3, May 2004 , pp. 671-676(6)

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Abstract:

The application of direct-current differential electrolytic potentiometry to the nonaqueous titration of amino acids was investigated. The basic character of amino acids in acetic acid was enhanced to permit their direct titration with perchloric acid. A pair of antimony electrodes was used as an indicating system. The shapes of the titration curves obtained were almost symmetrical with sharp peaks. The optimum current density for those titrations was found to be 1-2 μA/cm². The procedure was applied successfully to the determination of certain amino acids in drug formulations, and the results were favorably compared statistically with those obtained by official methods.

Document Type: Research article

Affiliations: 1: Girls College of Science, Department of Chemistry, PO Box 838, Dammam 31113, Saudi Arabia 2: King Fahd University of Petroleum and Minerals, Department of Chemistry, PO Box 1726, Dhahran 31261, Saudi Arabia 3: Girls College of Science, Department of Chemistry, PO Box 838, Damman 31113, Saudi Arabia

Publication date: 2004-05-01

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The Journal of AOAC INTERNATIONAL publishes refereed papers and reviews in the fields of chemical, biological and toxicological analytical chemistry for the purpose of showcasing the most precise, accurate and sensitive methods for analysis of foods, food additives, supplements and contaminants, cosmetics, drugs, toxins, hazardous substances, pesticides, feeds, fertilizers and the environment available at that point in time. The scope of the Journal includes unpublished original research describing new analytical methods, techniques and applications; improved approaches to sampling, both in the field and the laboratory; better methods of preparing samples for analysis; collaborative studies substantiating the performance of a given method; statistical techniques for evaluating data. The Journal will also publish other articles of general interest to its audience, e.g., technical communications; cautionary notes; comments on techniques, apparatus, and reagents.
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Differential Electrolytic Potentiometric Determination of Some Amino Acids in Dosage Forms

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