Preventing Staining to Hydroxyapatite Disk by Adding γ-cyclodextrin to Beverages Containing Polyphenols

抄録

In recent years, there has been an increasing demand for milky-white tooth color, prompting research. We devised a new method for preventing tooth staining caused by beverages by using cyclodextrin (CD) as a food additive. CDs are cyclic oligosaccharides consisting of several molecules of glucose linked by α-1,4 bonds. The coloring component of beverages, polyphenols, are incorporated into the cavities of the CDs to form a stable CD-polyphenol complex. In this study, to prevent tooth surface staining caused by various beverages, CDs (specifically α-CD, β-CD, and γ-CD (CDs)) were added to the beverages, which were then applied to hydroxyapatite (HA) discs and the coloration was examined. CDs added to black tea inhibited the tea-induced staining of the HA discs. In particular, β- and γ-CD prevented staining of the HA discs. Furthermore, due to its high water solubility, γ-CD effectively inhibited staining at higher concentrations. γ-CD inhibited staining not only by black tea, but also by various beverages, but the extent of the effect differed among beverages. This study suggests that γ-CD prevents tooth staining because of its ability to incorporate polyphenols.