Impact of crystalline form changing on behavior of microcapsules prepared from three-component gel system

Zsófia Fenyvesi, Khaled Omaru A Ashour, R. Zelkó, Ulrich Mller, I. Antal, I. Klebovich, Sylvia Marton

Research output: Contribution to journalArticle

Abstract

In this paper, the effect of anhydrous-monohydrate process-induced transformation of theophylline was examined in microcapsules produced by in situ gelation method using sodium alginate, hydroxypropylmethylcellulose and hydroxyethylcellulose. Films produced from gel were applied to characterize the changes by NIR spectroscopy, X-ray, DSC method and stereomicroscopy because it is easier to study that in films in the case of gel systems used in situ gelation process. The properties of end-product are influenced by the swelling ability, equilibrium water uptake, release profile and encapsulation efficiency. Water penetration and drug release were evaluated by Davidson-Peppas and Korsmeyer-Peppas models. The ex tempore formed monohydrate crystals were smaller and built into the matrix structure in a greater extent. Increased drug release, matrix erosion and diffuse reflectance values at 1470 and 1950nm were observed added theophylline later into the gel because of developing a denser structure.

Original languageEnglish
Pages (from-to)553-561
Number of pages9
JournalPharmaceutical Development and Technology
Volume15
Issue number6
DOIs
Publication statusPublished - Dec 2010

Fingerprint

Capsules
Gels
Theophylline
Near-Infrared Spectroscopy
Water
X-Rays
Drug Liberation
Hypromellose Derivatives
alginic acid
hydroxyethylcellulose

Keywords

  • Crystalline form
  • Hydrophilic polymers
  • In situ gelation
  • Microcapsule
  • Sodium alginate

ASJC Scopus subject areas

  • Pharmaceutical Science

Cite this

Impact of crystalline form changing on behavior of microcapsules prepared from three-component gel system. / Fenyvesi, Zsófia; Ashour, Khaled Omaru A; Zelkó, R.; Mller, Ulrich; Antal, I.; Klebovich, I.; Marton, Sylvia.

In: Pharmaceutical Development and Technology, Vol. 15, No. 6, 12.2010, p. 553-561.

Research output: Contribution to journalArticle

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