Molecular Biology and Genetics / Moleküler Biyoloji ve Genetik

Permanent URI for this collectionhttps://hdl.handle.net/11147/9

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Institution Author: search.filters.institutionAuthor.Aydın, Beyza Sultan

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  • Article
    Citation - WoS: 6
    Citation - Scopus: 6
    A Comparative Study of Hplc and Uv Spectrophotometric Methods for Oseltamivir Quantification in Pharmaceutical Formulations
    (Akademiai Kiado, 2022) Güngör, Serdar; Bulduk, İbrahim; Aydın, Beyza Sultan; İlikçi Sağkan, Rahşan
    Oseltamivir is an antiviral drug and is used in the treatment of all influenza viruses. It is the most effective antiviral option against all influenza viruses that can infect humans. UV and LC methods have been developed and validated according to ICH guidelines for various parameters like selectivity, linearity, accuracy, precision, LOD and LOQ, robustness for the quantitative determination of oseltamivir in pharmaceutical formulations. LC method has been performed using reverse phase technique on a C-18 column with a mobile phase consisting of 20 mM potassium dihydrogen phosphate solution and acetonitrile (60:40, v/v) at 25 8C. The mobile phase flow rate was 1.2 mL min-1. For the determination of oseltamivir, UV spectrum has been recorded between 200 and 800 nm using methanol as solvent and the wavelength of 215 nm has been selected. Both methods have demonstrated good linearity, precision and recovery. No spectral and chromatographic interferences from the capsule excipients were found in UV and LC methods. In both methods, correlation coefficients were greater than 0.999 within a concentration range of 10???60 mg mL-1 using UV and LC. Intra-day and inter-day precision with low relative standard deviation values were observed. The accuracy of these methods was within the range 99.85???100.17% for LC and from 99.26 to 100.70% for UV. Therefore UV and LC methods gave the most reliable outcomes for the determination of oseltamivir in pharmaceutical formulation.
  • Article
    Citation - WoS: 8
    Citation - Scopus: 8
    Simple High-Performance Liquid Chromatographic Method for Determination of Donepezil Hcl in Pharmaceutical Formulations
    (ACG Publications, 2020) Bulduk, İbrahim; Aydın, Beyza Sultan
    Donepezil HCl is a hydrochloride salt of a piperidine derivative acetylcholinesterase inhibitor and, it uses in treatment demantia of Alzheimer’s disease. In this study, a sensitive and rapid HPLC-UV method was developed and validated for determination of Donepezil HCl in API and tablet dosage forms. Chromatographic separation was performed using a Ace 5 C18 (5 ?m, 250 x 4.6 mm) by using isocratic phosphate buffer at pH:2.0 and acetonitrile (55:45, v/v) mobile phase was used at the rate of 1.2 mL/min. The column temperature was set at 30 ?C and the UV detection was recorded at 268 nm. The method was validated with respect to specificity, precision, accuracy, linearity, repeatability and reproducibility parameters in a concentration range of 25-125 µg/mL. The limit of detection (LOD) and limit of quantification (LOQ) were determined as 1.40 and4.20 µg/mL, respectively. The uncertainty budget of the measurement for Donepezil HCl was estiamted as 5.80 % at 95% confidence level (k = 2).