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Article
Spectrophotometric Determination of Doxycycline Hyclate in Pure and Capsule using Diazotization Reaction

Authors: Ruba Fahmi Abbas --- Ali Amer Wheeb --- Ala'a Abdullwahid Jasim
Journal: Al-Mustansiriyah Journal of Science مجلة علوم المستنصرية ISSN: 1814635X Year: 2016 Volume: 27 Issue: 5 Pages: 50-54
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

A sensitive spectrophotometric method has been developed for the determination of Doxycycline hyclate (DCH) as pure and capsule forms. This method is based on diazotization of primary amine group of benzocaine with sodium nitrite in hydrochloric acid medium; the formed diazonium salt is then reacted with DCH in sodium hydroxide medium, to form yellow – orange Azo dye. Beer's law is obeyed in the concentration rang 16-34mg. ml-1 at 480 nm with detection limit LOD and molar absorptivity Є were found to be 0.418 mg.ml-1 and 2.214× 10+4 L.mol-1.cm-1, respectively.


Article
Zero order and first Derivative Spectrophotometric Determination of pb(II) by Complex with N,N'-cyclohexane-l,2-diylidene-bis (4-methaxybenzoythydrazide) (CHMBH)
طريقة الترتيب الصفري والمشتقة الاولى لتقدير الرصاص باستخدام التعقيد مع ن, ن- سايكلوهيكسان-1,2-دايلادين-ثنائي(4-ميثاكسي بنزويثايدرازايد) (CHMBH)

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Abstract

In this work, two novel, accurate and reliable spectrophotometric methods have been developed for the determination of pb(II) ion by complexion with the ligand N,N'-cyclohexane-l,2-diylidene-bis(4-methaxybenzoythydrazide (CHMBH). In this study, pb(II) ion was determined by the application of Zero order and first Derivative Spectrophotometric by measuring the amplitude at 258 nm, The linearity ranges for both methods were found to be 20–55 mg/l, Limit of Detection and Quantitation were found to be 0.33 mg/l and 1 mg/l for zero order and 1.438 mg/l and 4.360 mg/l for first derivative method respectively.Both methods have good accuracy found to be 99.594% and 100.497% respectively.

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