In vitro characteristics of liposomes and double liposomes prepared using a novel glass beads method

Kenji Yamabe, Yoshinori Kato, Hiraku Onishi, Yoshiharu Machida

Research output: Contribution to journalArticlepeer-review

Abstract

A novel preparative method for liposomes and double liposomes (DL) using glass beads was superior to a glass-filter method developed previously. Lipid dissolved in chloroform was poured into a kjeldahl flask with glass beads (BZ-04, 0.350-0.500 mm φ; BZ-3, 2.794-3.962 mm φ; or BZ-6, 5.613-6.680 mm φ), and the organic solvent was evaporated. The lipid layer that formed on the glass beads was hydrated with 1.5 ml of the suspension of inner liposomes at a temperature above the phase transition temperature of the lipids employed, and was agitated vigorously. Erythrosine (ER) was used as a model drug. The size of liposomes prepared by the glass beads method depended on the size of the glass beads. The size of the liposomes became smaller as glass beads with a smaller size were used. A high encapsulation efficiency was observed when glass bead blends consisting of two different sizes were used. Large sizes (BZ-3/BZ-6) had a tendency to show high encapsulation efficiency and size also played an important role in the formation of liposomes. DL formation inhibited the release of ER and DL formative efficiency was markedly improved by means of the glass beads method. These findings suggested that the glass beads method developed in this study conferred a high drug loading and a high DL formation on liposomes compared with ordinary methods.

Original languageEnglish (US)
Pages (from-to)71-79
Number of pages9
JournalJournal of Controlled Release
Volume90
Issue number1
DOIs
StatePublished - Jun 5 2003
Externally publishedYes

Keywords

  • Double liposomes
  • Encapsulation efficiency
  • Glass beads
  • Preparation
  • Size control

ASJC Scopus subject areas

  • Pharmaceutical Science

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