Enhancement of Oral Bioavailability ofd-a-Tocopherol d-a-Tocopherol Acetate by Lecithin-Dispersed Aqueous Preparation Containing Medium-Chain Triglycerides in Rats

Toshikiro Kimura, Eiji Fukui, Akira Kageyu, Harumi Kurohara, Yuji Kurosaki, Taiji Nakayama, M. Morita, Koichi Shibusawa, Yoshinori Takeda, Shigemitsu Ohsawa

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19 Citations (Scopus)

Abstract

In order to evaluate oral dosage forms of d-a-tocopherol acetate (VEA), d-a-tocopherol (VE) concentration in the plasma was examined following oral administration of three VEA preparations; lecithin-dispersed aqueous preparation, polysorbate 80 (PS-80)-solubilized aqueous solution and soybean oil solution. The lecithin-dispersed preparation gave the highest Cmax and the largest AUC^24hi while Tmax was delayed. In the thoracic duct fistula rat, no increase in VE plasma concentration was observed after intraduodenal administration of lecithin-dispersed VEA preparation, while VE appeared in the thoracic lymph, indicating that VE is absorbed from the lecithin-dispersed preparation via the lymphatic route. The delayed Tmax and prolonged VE plasma concentration obtained with the lecithin-dispersed preparation in comparison with PS-80-solubilized aqueous solution could be explained by the different route of absorption.

Original languageEnglish
Pages (from-to)439-441
Number of pages3
JournalChemical and Pharmaceutical Bulletin
Volume37
Issue number2
DOIs
Publication statusPublished - Jan 1 1989

Keywords

  • d-a-tocopherol
  • d-a-tocopherol acetate
  • lecithin-dispersed preparation
  • lymphatic absorption
  • oral dosage form

ASJC Scopus subject areas

  • Chemistry(all)
  • Drug Discovery

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