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Öğe Application of continuous wavelet transforms for simultaneous estimation of domperidone and lansoprazole in capsule formulations(Elsevier B.V., 2025) Ertekin, Zehra Ceren; Büker, Eda; Oral, Elif Varhan; Dinç, ErdalUV–Vis spectroscopy remains essential in pharmaceutical research and quality control due to its accessibility, simplicity, and effectiveness. However, overlapping spectra resulting from multicomponent drug formulations present challenges. Here, we describe a signal processing strategy using continuous wavelet transform (CWT) to resolve overlapping spectra of domperidone (DMP) and lansoprazole (LSP) for simultaneous quantification. Three different wavelet functions (Symlets 3, Coiflets 1, Daubechies 10), were found to be suitable for this purpose. Linear calibration curves were constructed using the CWT zero-crossing technique and the methods were validated by analyzing a set of synthetic mixtures, intra-and inter-day samples, and standard addition samples. The assay results of commercial capsule samples were compared with those obtained by derivative spectroscopy, and no significant statistical difference was observed. The proposed CWT methods demonstrated good compliance with the label claims and proved to be reliable, versatile, fast, and cost-efficient analytical methods without the need for preliminary separation procedures.Öğe Comparative study of the quantitative resolution of paracetamol and methocarbamol mixture by spectrophotometry with wavelet transform and UPLC techniques(Springer, 2022) Güzel, Remziye; Ertekin, Zehra Ceren; Ziyadanoğulları, Berrin; Dinç, Erdal; Ziyadanoğulları, RecepThe aim of this study was to develop a new simple and cost-effective spectrophotometric method to be used as an alternative to chromatography for the analysis of paracetamol and methocarbamol (PAR-MET) combination. In this regard, a comparative study on the quantitative resolution of PAR and MET mixture using continuous wavelet transform (CWT) and ultra-performance liquid chromatography (UPLC) techniques was performed. In interpretation of the spectrophotometric data, three different wavelet families Biorthogonal3.5 (Bior3.5), Mexican Hat Function (Mexh), and Symlets5 (Sym5) were found suitable to get better transform of zero-order spectra of the samples containing PAR and MET. The concentrations of PAR and MET in the working range of 4.0 - 20.0 mu g/mL and 5.0 - 45.0 mu g/mL, respectively, were proportional to the wavelet amplitudes. This mathematical relationship was used to construct calibration curves for each compound. After validation of the CWT method, analyses of commercial tablets were successfully performed. A new UPLC method was developed and validated in order to compare the results with those obtained by the CWT method and the data were found comparable. The analysis of results obtained from experimental trials showed that the proposed CWTmethod is suitable for the quality control and quantitative assessment of both active substances in tablet formulations.Öğe Geleneksel Mardin mimarisinde kullanılan malzeme ve uygulanan yapım tekniklerinin günümüz restorasyon uygulamalarında sürdürülebilirliğinin incelenmesi(2016) Dinç, Erdal; Dalkılıç, NeslihanBu çalışma, geleneksel Mardin mimarisinin malzeme, yapım teknolojisi ve yapım örgütlenmesini konu almaktadır. Çalışmanın ana hedefi, bu yapı malzeme ve tekniklerinin unutulmadan önce belgelenmesini sağlamaktır. Böylece, tarihi eserlerin gelecek kuşaklara aktarımını sağlayacak restorasyon müdahalelerinde, özgüne uygun şekilde müdahale kararlarının alınmasına yardımcı olmak ve bu konuda çalışacaklara veri sağlanması amaçlanmıştır. Çalışma; günümüzde yürütülmekte olan restorasyon uygulamalarının izlenmesi, yapı ustaları ile yapılan görüşmeler, atölyelerde ve ocaklarda yapılan incelemeler ile konuyla ilgili arşivlerde yapılan araştırmalar sonucu gerçekleştirilmiştir. Çalışma sekiz bölümden oluşmuştur. Birinci bölümde çalışmanın amacı, önemi, kapsam ve sınırlılıkları, ikinci bölümde önceki çalışmalar, üçüncü bölümde materyal ve metot, dördüncü bölümde Mardin tarihi, coğrafyası ve geleneksel kent dokusu incelenmiştir. Beşinci bölümde geleneksel Mardin mimarisinde malzeme, yapı harçları ve yapım tekniği incelenmiş; taş, kerpiç, ahşap, demir, kireç, alçı, sıva ve harç gibi geleneksel yapı malzemeleri ile yapı harç bileşenleri üretim aşamaları anlatılmıştır. Altıncı bölümde geleneksel yapım teknikleri ve yapımda kullanılan aletler ile günümüzde kullanılan aletler detaylı bir biçimde anlatılmıştır. Yedinci bölümde taş ocakları, taş atölyeleri ve yapı örgütlenmesi içinde yer alan yapı ustaları anlatılmıştır. Sekizinci bölümde çalışmanın genel değerlendirmesi yapılmış, geleneksel yapım bilgisinin gerekliliği vurgulanarak, yeni restorasyon ve koruma çalışmaları için öneriler sunulmuştur. Anahtar sözcükler: Geleneksel Yapım Teknikleri, Malzeme, Mardin, RestorasyonÖğe A New application of PARAFAC model to UPLC dataset for the quantitative resolution of a tri-component drug mixture(Oxford University Press, 2021) Güzel, Remziye; Ertekin, Zehra Ceren; Dinç, ErdalIn the presented work, a three-way analysis of ultra-performance liquid chromatography-photodiode array (UPLC-PDA) dataset was performed by parallel factor analysis (PARAFAC) for quantitatively resolving a ternary mixture containing paracetamol and methocarbamol with indapamide selected as an internal standard in their co-eluted chromatographic conditions. Paracetamol and methocarbamol were quantified in the working range between 3-24 and 5-50 mu g/mL by applying PARAFAC decomposition to UPLC-PDA data array obtained under unresolved chromatographic peak conditions. To compare the experimental results provided by co-eluted UPLC-PARAFAC method, an ordinary UPLC method was developed ensuring proper separation of the peaks. The performance of both PARAFAC and ordinary UPLC methods were assessed by quantifying independent test samples, intra- and inter-day samples and spiked samples of pharmaceutical preparations. Then, both methods were applied for quantitative estimation of the related drugs in a commercial pharmaceutical preparation. In this study, PARAFAC method was proved to be a very powerful alternative for the quality control of pharmaceutical preparations containing paracetamol and methocarbamol even in their co-eluted chromatograms with high precision and accuracy in a short chromatographic runtime of 1.2 min.Öğe New voltammetric approach to the quantitative estimation of sildenafil citrate in tablets using disposable pencil graphite electrode(American Scientific Publishers, 2014) Güzel, Remziye; Ekşi, Haslet; Dinç, Erdal; Solak, Ali OsmanThe voltammetric behavior of sildenafil citrate (SC) was studied through differential pulse stripping voltammetry. The best sensitivity, optimal experimental conditions and settings for the voltammetric method development were obtained by applying experimental design and optimization methodology to the designed sample runs at different accumulation times, accumulation potentials and pHs. The linearity over the concentration range 1 × 10-7 M-8 × 10-6 M for SC was determined and the limit of detection (LOD) was 3.1 × 10-8 M. For the method ability and validity, mean recovery result and relative standard deviation were found to be 99.3% and 2.19%, respectively. The method was applied to the determination of SC in pharmaceutical and plasma samples.
