Abstract
Objectives
To assess the absorption of a-tocopherol acetate and 18b-glycyrrhetinic acid, which are used as active ingredients in toothpaste, into a reconstructed gingival tissue.
Methods
EpiGingivalTM tissues were treated with a 25% slurry of toothpaste containing 2% a-tocopherol acetate and 0.3% 18b-glycyrrhetinic acid, for 2 minutes. The treatment was repeated up to 6 times, with 1 hour intervals. After completion of all treatments, the active ingredients in the tissue extracts and receiver solutions were measured by high performance liquid chromatography.
Results
Although a-tocopherol acetate was not detected, α-tocopherol was detected in the tissue extracts, indicating that a-tocopherol acetate was bioconverted to α-tocopherol after absorption. We could detect 18β-glycyrrhetinic acid both in the tissue extracts and in the receiver solutions, with a positive correlation to the number of treatments.
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Fig. 1.
HPLC analysis. (A) α-tocopherol acetate (B) α-tocopherol (C)18β-glycyrrhetinic acid and (D) dipotassium glycyrrhizate. The top figures represent standards and the bottom ones represent the test samples. Arrows are the peaks of the target materials.
Fig. 2.
Absorption and metabolism of α-tocopherol acetate. Toothpaste slurries were treated onto the EpiGingivalTM surfaces for 2 minutes. Treatments were repeated 2, 4, or 6 times. After all treatment, α-tocopherol (α-Toc) was measured by HPLC.



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