Journals / Ankara Üniversitesi Eczacılık Fakültesi Dergisi / 2026 / Cilt: 48 Sayı: 1

DETERMINATION OF THE CHROMATOGRAPHIC IONIZATION CONSTANT VALUE OF THE POPULAR DIURETIC DRUG HYDROCLOROTHIAZIDE

POPÜLER DİÜRETİK İLAÇ HİDROKLOROTİAZİDİN KROMATOGRAFİK İYONLAŞMA SABİTİ DEĞERİNİN BELİRLENMESİ

Yaşar Doğan Daldal(KAHRAMANMARAŞ İSTİKLAL ÜNİVERSİTESİ, ELBİSTAN SAĞLIK HİZMETLERİ MESLEK YÜKSEKOKULU)0000-0003-1211-2686
Ebru Çubuk Demiralay(SÜLEYMAN DEMİREL ÜNİVERSİTESİ)0000-0002-6270-7509
Pages
169–178
Publication Date
2024-01-20
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

Moreover, the determined values are the first thermodynamic (_w^w)〖pK〗_(a_1 ) data in the literature obtained by any analytical method for hydrochlorothiazide.

📌 3 Key Takeaways

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Objective & Hypothesis:Objective: Hydrochlorothiazide is a drug that lowers blood pressure by decreasing Na+ and Cl- levels while increasing the rate and volume of urine excretion.
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Key Findings & Data:Material and Method: The ionization constant of hydrochlorothiazide was determined in a binary mixture of 11%, 13%, and 15% (v/v) acetonitrile and water at 30oC, a flow rate of 1 ml/min, and an X Terra C18 column.
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Conclusion & Impact:Moreover, the determined values are the first thermodynamic (_w^w)〖pK〗_(a_1 ) data in the literature obtained by any analytical method for hydrochlorothiazide.
🔬Design:Modeling & Simulation
📍Scope:Comprehensive Sample
⚙️Variables:Hidroklorotiazid · iyonlaşma sabiti tayini · LSER modeli

Abstract

Objective: Hydrochlorothiazide is a drug that lowers blood pressure by decreasing Na+ and Cl- levels while increasing the rate and volume of urine excretion. This drug is used alone or in combination with other antihypertensive medications. However, the action mechanism of such an important drug is unknown, and in the literature, there is only one study on the value of the ionization constant of the compound in hydroorganic systems and no study on the value of the ionization constant of the compound in water. Therefore, in this study, an attempt was made to determine the ionization constant of hydrochlorothiazide in various binary acetonitrile-water mixtures and to determine the ionization constant of hydrochlorothiazide in water by using these values through various extrapolation methods. Material and Method: The ionization constant of hydrochlorothiazide was determined in a binary mixture of 11%, 13%, and 15% (v/v) acetonitrile and water at 30oC, a flow rate of 1 ml/min, and an X Terra C18 column. To determine the ionization constant of hydrochlorothiazide, the pH retention relationship was evaluated using the linear solvation energy relationship (LSER) model. To determine the ionization constant values in water, the data obtained from the LSER model were evaluated using the Yasuda-Shedlowsky method and the mole fraction- (_s^s)〖pK〗_a method. Result and Discussion: The agreement between the thermodynamic (_w^w)〖pK〗_(a_1 ) values calculated by the two methods is remarkable and consistent with those found in the literature for the organic solvent-water environment. Considering this information, the accuracy and reproducibility of the determined (_w^w)〖pK〗_(a_1 ) value of hydrochlorothiazide becomes clear. Moreover, the determined values are the first thermodynamic (_w^w)〖pK〗_(a_1 ) data in the literature obtained by any analytical method for hydrochlorothiazide.

Özet

Amaç: Hidroklorotiazid, idrar çıkışının hızını ve hacmini arttırırken, Na+ ve Cl- içeriğini azaltarak kan basıncını düşüren bir ilaçtır. Bu ilaç, tek başına ya da diğer hipertansif ilaçlarla beraber kullanılmaktadır. Ancak, bu kadar önem arz eden bir ilacın etki mekanizması tam olarak bilinmemekle birlikte, bileşiğin hidro-organik sistemlerdeki iyonlaşma sabiti değeriyle alakalı literatürde sadece bir çalışma ve bileşiğin sudaki iyonlaşma sabiti değeriyle alakalı hiç çalışma yoktur. Bu nedenle bu çalışmada, farklı asetonitril-su ikili karışımlarında hidroklorotiazidin iyonlaşma sabiti değerlerinin tayini ve bu değerler kullanılarak çeşitli ekstrapolasyon yöntemleriyle hidroklorotiazidin su ortamındaki iyonlaşma sabiti değerinin tayini amaçlanmıştır. Gereç ve Yöntem: Hidroklorotiazidin iyonlaşma sabiti tayini %11, %13 ve %15 (h/h) asetonitril-su ikili karışımında 30oC’de, 1 ml/dakika akış hızında ve X Terra C18 kolonda gerçekleştirilmiştir. Hidroklorotiazidin iyonlaşma sabitinin belirlenmesi için pH-alıkonma ilişkisi, lineer solvasyon enerjisi ilişkisi (LSER) modeliyle değerlendirilmiştir. Sudaki iyonlaşma sabiti değerlerinin tayini için LSER modelinden elde edilen veriler, Yasuda-Shedlovsky ve mol kesri-(_s^s)〖pK〗_a yöntemiyle değerlendirilmiştir. Sonuç ve Tartışma: Her iki metotla hesaplanan termodinamik (_w^w)〖pK〗_(a_1 ) değerlerinin birbiriyle uyumu dikkat çekicidir ve literatürdeki organik çözücü-su ortamında elde edilen değerle uyumludur. Bu bilgiler ışığında, hidroklorotiazidin tayin edilen (_w^w)〖pK〗_(a_1 ) değerinin doğruluğu ve tekrarlanabilirliği açıkça görülmektedir. Ayrıca, tayin edilen değerler hidroklorotiazidin herhangi bir analitik yöntemle tayin edilen literatürdeki ilk termodinamik (_w^w)〖pK〗_(a_1 ) verileridir.

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Cite This Article

Daldal, Y. D., Demiralay, E. Ç. (2024). DETERMINATION OF THE CHROMATOGRAPHIC IONIZATION CONSTANT VALUE OF THE POPULAR DIURETIC DRUG HYDROCLOROTHIAZIDE. Ankara Üniversitesi Eczacılık Fakültesi Dergisi, Cilt: 48 Sayı: 1, 169–178. https://doi.org/10.33483/jfpau.1346354

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