Effect of sulfobutyl ether-β-cyclodextrin and propylene glycol alginate on the solubility of clozapine

Takayuki Furuishi, Kohei Sekino, Mihoko Gunji, Kaori Fukuzawa, Hiromasa Nagase, Tomohiro Endo, Haruhisa Ueda, Etsuo Yonemochi

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Clozapine (CLZ) is an atypical antipsychotic medication used in the treatment of schizophrenia and is poorly soluble in water (0.05 mM). In this study, we have investigated the effect of β-cyclodextrin (CD) and its derivatives on the solubility of CLZ. The solubility of the CLZ was measured to generate a phase solubility diagram, and the interaction between CLZ and sulfobutyl ether-β-cyclodextrin (SBE-β-CD) in aqueous solution was observed by 1 H- and 2D rotating-frame Overhauser enhancement spectroscopy (ROESY)-NMR methods. Moreover, the synergistic effect of SBE-β-CD and water-soluble polymers, including polyvinylpyrrolidone, hydroxypropyl methylcellulose, carboxymethylcellulose sodium salt, polyvinyl alcohol, sodium alginate, and propylene glycol alginate (PGA), on the solubility of CLZ was investigated. The results show that the solubility of CLZ with 1 w/v% PGA was 7.6 mM, which was almost four times greater than that of CLZ without PGA in a 15 mM SBE-β-CD solution. In contrast, the solubility of CLZ with 1 w/v % PGA in an aqueous solution decreased by one-third relative to that of CLZ in a 15 mM SBE-β-CD solution. 2D ROESY-NMR indicated that a CLZ/SBE-β-CD/PGA ternary complex formed. It was found that the combination of PGA and SBE-β-CD enhanced the solubility of CLZ.

Original languageEnglish
Pages (from-to)479-486
Number of pages8
JournalPharmaceutical Development and Technology
Volume24
Issue number4
DOIs
Publication statusPublished - 2019 Apr 21
Externally publishedYes

Keywords

  • Clozapine
  • NMR spectrum
  • cyclodextrins
  • propylene glycol alginate
  • solubility
  • ternary complex

ASJC Scopus subject areas

  • Pharmaceutical Science

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