Spectrophotometric Determination of Methyldopa in Pure and Pharmaceutical Preparations by the Oxidative Coupling Reaction with 1, 5-Diaminonaphthalene in the Presence of Ammonium Ceric (IV) Nitrate

Ghaib Allah, Noor Mansoor; Ahmed, Abdul Majeed Khorsheed; Tapabashi, Nashwan O.

doi:10.32894/kujss.2022.133098.1060

Authors

¹ Department of Chemistry, College of Science, Kirkuk University, Kirkuk, Iraq.

² Department of Chemistry, College of Education for Pure Science, Kirkuk University, Kirkuk, Iraq

³ College of Pharmacy, Kirkuk University, Kirkuk, Iraq.

Document Type : Research Paper

10.32894/kujss.2022.133098.1060

Abstract

Oxidative coupling reactions are one of the significant methods used in the estimation of certain drugs in pharmaceutical formulations. This study describes the development of a fast and sensitive spectroscopic method considering the determination of trace amounts of methyldopa in an acidic aqueous solution.The adopted method centered on oxidative coupling due to the drug Methyldopa with the reagent 1, 5-diaminonaphthalene in the presence of ceric (IV) ammonium nitrate as oxidizing agent to form a stable blue-colored product, giving the highest absorption at 730 nm. The product was appeared to agree Beer's law within the limits of (5.4 - 39.6) μg /ml, and a value of molar absorptivity equal to 4.79471 ×104 L/ mol. cm. Sandell’s index, 0.0044 μg/ cm2, Relative standard deviation was in the range (0.5942 - 0.9687) %, whereas recovery average and determination factor were 99.908% and 0.9998. The proposed method has been successfully applied in the determination of Methyldopa in its pharmaceutical preparations.

Keywords

Main Subjects

Chemistry

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Kirkuk Journal of Science

Spectrophotometric Determination of Methyldopa in Pure and Pharmaceutical Preparations by the Oxidative Coupling Reaction with 1, 5-Diaminonaphthalene in the Presence of Ammonium Ceric (IV) Nitrate

References

References

Volume 17, Issue 4
December 2022
Page 42-49

Spectrophotometric Determination of Methyldopa in Pure and Pharmaceutical Preparations by the Oxidative Coupling Reaction with 1, 5-Diaminonaphthalene in the Presence of Ammonium Ceric (IV) Nitrate

References

References

Volume 17, Issue 4December 2022Page 42-49

Volume 17, Issue 4
December 2022
Page 42-49