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Dissolution of Nimodipine in Aqueous Solutions of Hydroxyethyl-β-cyclodextrin and theSurvey of Nimodipine Solubilization with Cyclodextrins
Rozpouštění nimodipinu ve vodných roztocích hydroxyethyl-β-cyklodextrinu a přehledsolubilizace nimodipinu cyklodextriny
Práce podává souborné výsledky studia rozpouštění kalciového antagonisty nimodipinu ve vodnýchroztocích devíti cyklodextrinů, nativního β-cyklodextrinu (β-CD) a jeho derivátů hydroxyethyl-β-CD(HE-β-CD), tří hydroxypropyl-β-CD (HP-β-CD) s navzájem různým stupněm substituce, methyl-β--CD (M-β-CD), nativního α-cyklodextrinu (α-CD), hydroxypropyl-α-CD (HP-α-CD) a hydroxypropyl--γ-CD (HP-γ-CD). Rozpouštění nimodipinu bylo sledováno v závislosti na čase (až 14 dní) a koncentracicyklodextrinu zhruba do 0,07 mol/l, s výjimkouméně rozpustného β-CD.Ve sledovanémrozmezíbyly pozorovány vesměs lineární fázové diagramy rozpustnosti nimodipinu v roztocích studovanýchcyklodextrinů, z nichž byly vyhodnoceny konstanty stability inkluzních komplexů nimodipin –cyklodextrin (1 : 1) a odvozeny lineární empirické rovnice pro výpočet koncentrace solubilizovanéhonimodipinu při dané koncentraci cyklodextrinu.Nejúčinnějším solubilizérem nimodipinu je M-β-CD,dobrou solubilizační účinnost mají též HE-β-CD a HP-β-CD s nízkým stupněm substituce, kterémohou být přijatelné i pro přípravu parenterálních roztoků nimodipinu.
Klíčová slova:
nimodipin – kalciový antagonista – cyklodextriny – inkluzní komplexy –solubilizace – rozpouštění
Authors: F. Kopecký; B. Kopecká 1; P. Kaclík
Authors‘ workplace: Katedra fyzikálnej chémie liečiv Farmaceutickej fakulty Univerzity Komenského, Bratislava 1Katedra farmaceutickej analýzy a nukleárnej farmácie Farmaceutickej fakulty Univerzity Komenského, Bratislava
Published in: Čes. slov. Farm., 2003; , 33-38
Category:
Overview
The results of a comprehensive study of the dissolution of the calcium antagonist nimodipine inaqueous solutions of nine cyclodextrins are reported. The used cyclodextrins were native β-cyclodextrin(β-CD), its derivatives hydroxyethyl-β-CD (HE-β-CD), three hydroxypropyl-β-CD (HP-β-CD)with various degree of substitution and methyl-β-CD (M-β-CD), native α-cyclodextrin (α-CD),hydroxypropyl-α-CD (HP-α-CD) and hydroxypropyl-γ-CD (HP-γ-CD). The nimodipine dissolutionwas studied as a function of time (up to 14 days) and cyclodextrin concentration up to 0.07 mol/l,excepting the less soluble β-CD. In this range of cyclodextrin concentration, linear phase diagramsof nimodipine solubility in the cyclodextrin solutions were observed. From them we derived thestability constants of the inclusions complexes nimodipine – cyclodextrin (1 : 1) as well as theempirical linear equations for the calculation of the saturated nimodipine concentration at a givencyclodextrin concentration. The most efficient solubiliser of nimodipine was M-β-CD, a good solubilizingefficiency was also shown by HE-β-CD and HP-β-CDs (with a low degree of substitution),which may be acceptable for the preparation of parenteral nimodipine solutions.
Key words:
nimodipine – calcium antagonist – cyclodextrins – inclusion complexes –solubilization – dissolution
Labels
Pharmacy Clinical pharmacology
Article was published inCzech and Slovak Pharmacy
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