Journal List > J Korean Acad Oral Health > v.40(2) > 1057718

Kim, Kim, You, Cho, Shin, and Lee: Gingival absorption of α-tocopherol acetate and 18b-glycyrrhetinic acid : in vitro evaluation in reconstructed gingival tissue

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.

Conclusions

We found that our toothpaste effectively delivered α-tocopherol acetate and 18α-glycyrrhetinic acid to a reconstructed gingival tissue in vitro.

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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.
jkaoh-40-79f1.tif
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.
jkaoh-40-79f2.tif
Fig. 3.
Absorption of 18β-glycyrrhetinic acid. After repeated treatment of 25% toothpaste slurries, 18β-glycyrrhetinic acid (GA) was measured in the tissue extracts (A) and the assay media (B).
jkaoh-40-79f3.tif
Fig. 4.
Comparision of 18β-glycyrrhetinic acid and dipotassium glycyrrhizate. After repeated treatment of 25% toothpaste slurries 6 times, 18β-glycyrrhetinic acid (GA) and dipotassium glycyrrhizate (DPG) was measured in the tissue extracts (A) and the assay media (B). *P<0.05.
jkaoh-40-79f4.tif
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