| Summary: | Development of a novel antioxidant-delivery vehicle exerting biosafety has been attracting a great deal of interest. In this study, a vehicle comprising a natural composite consisting of vitamin E (α-tocopherol; Toc) and cyclodextrin (CD) additives was developed, directed toward aqua-related biological applications. Not only <i>β</i>-CD, but also <i>γ</i>-CD, tended to form a water-insoluble aggregate with Toc in aqueous media. The aggregated vehicle, in particular the <i>γ</i>-CD-added system, showed a remarkable sustained effect because of slow dynamics. Furthermore, a prominent cytoprotective effect by the <i>γ</i>-CD–Toc vehicle under the oxidative stress condition was confirmed. Thus, the novel vitamin E vehicle motif using <i>γ</i>-CD as a stabilizer was proposed, widening the usability of Toc for biological applications.
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