Development and Validation of Two New Methods for the Determination of Rilmenidine in Bulk and Pharmaceutical Preparation

Özdemir E., Ergin Kizilçay G., Ertürk Toker S.

JOURNAL OF CHROMATOGRAPHIC SCIENCE, vol.60, no.1, pp.45-50, 2022 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 60 Issue: 1
  • Publication Date: 2022
  • Doi Number: 10.1093/chromsci/bmab035
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Analytical Abstracts, Aqualine, Aquatic Science & Fisheries Abstracts (ASFA), BIOSIS, CAB Abstracts, Chemical Abstracts Core, EMBASE, Food Science & Technology Abstracts, MEDLINE, Pollution Abstracts, Veterinary Science Database
  • Page Numbers: pp.45-50
  • Istanbul University Affiliated: Yes


In the present study, two new methods were developed and validated for the determination of rilmenidine in bulk and pharmaceutical preparation. Both methods are based on a derivatization reaction using 4-chloro-7-nitro-1,2,3-benzoxadiazole (NBD-CI) as a fluorogenic substance. The drug reagent derivatives were formed by the reaction of rilmenidine with NBD-CI at pH 9.0 at 70 degrees C for 40 min. The reaction mixtures were analyzed by spectrofluorimetry in the first method and high performance liquid chromatography (HPLC) in the second method. Derivatives were determined at lambda ex 493 nm and at lambda em 536 nm in the spectrofluorimetric method. The separation was performed place on a Phenomenex, C18 column (250 x 4.6 mm, 5 mu m i.d) using a mobile phase comprising 0.2% formic acid and acetonitrile gradient elution mode in the HPLC method. Analytes were detected by a fluorescence detector at the same wavelength. The methods were validated for limit of quantitation, linearity, robustness, recovery, limit of detection, precision and accuracy. Calibration curves for the first and second methods were found to be linear in the range of 2.0-12.0 and 250-2000 ng/mL, respectively. Detection limits for the spectrofluorimetric and HPLC methods were calculated as 0.16 and 18.28 ng/mL, respectively. The validated methods were applied successfully to the determination of rilmenidine in bulk and pharmaceutical preparation.