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A direct, sensitive and efficient spectrophotometric method for the determination of nitrofurantoindrug (NIT) in pure as well as in dosage form (capsules) was described. The suggested method wasbased on reduction NIT drug using Zn/HCl and then coupling with 3-methyl-2-benzothiazolinonehydrazone hydrochloride (MBTH) in the presence of ammonium ceric sulfate. Spectrophotometricmeasurement was established by recording the absorbance of the green colored product at 610 nm.Using the optimized reaction conditions, beer’s law was obeyed in the range of 0.5-30 μg/mL, withgood correlation coefficient of 0.9998 and limits of detection and quantitation of 0.163 and 0.544μg/mL, respectively. The accuracy and precision of the proposed method represented by recovery andrelative standard deviation were satisfactory; about 99.33% and 1.16%, respectively. The proposedmethod was applied for determination of NIT in its pharmaceutical forms and the results comparedsuccessfully with those obtained by standard method (British pharmacopeia method).Keywords: Nitrofurantoin , MBTH , Oxidative coupling reaction.

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Abstarct

New, simple and sensitive batch and reverse FIA spectrophotometric methods for the determination of doxycycline hyclate in pure form and in pharmaceutical preparations were proposed. These methods based on oxidative coupling reaction between doxycycline hyclate and 3-methylbenzothiazolinone-2-hydrazone hydrochloride (MBTH) in the presence ammonium ceric sulfate in acidic medium, to form green water-soluble dye that is stable and has a maximum absorbance at 626 nm. A calibration graph shows that a Beer's law is obeyed over the concentration range of 1-80 and 0.5-110 μg.mL-1 of DCH for the batch and rFIA respectively with detection limit of 0.325 μg.mL-1 of DCH for r-FIA methods. All different chemicals and physical experimental parameters affecting the development and stability of the colored product were carefully studied. The proposed methods were successfully applied for the determination of DCH in pharmaceutical preparations.

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