Issue 2, 2021

XAS study of Sn speciation in toothpaste

Abstract

Stannous fluoride (SnF2) is an effective antimicrobial agent and fluoride carrier to dental enamel. However, stannous complexes are known to readily oxidize in presence of O2 and interact with a variety of ligands such as organic and inorganic compounds commonly present in toothpaste. Therefore, the stability of stannous species inside toothpaste remains an open question. Here we probe the speciation of Sn in solutions of known composition and in commercial toothpaste using Sn K-edge X-ray absorption spectroscopy. We show that the oxidation state of Sn and its chemical nature depends on both paste composition and time of opening, with Sn ultimately oxidizing into amorphous Sn(IV) hydroxide, Sn(OH)4. These results highlight the effect of paste composition and utilization on the speciation of active ingredients such as SnF2, and contribute to a rational design of toothpaste formulations that enhances the stability of stannous agents.

Graphical abstract: XAS study of Sn speciation in toothpaste

Supplementary files

Article information

Article type
Paper
Submitted
02 Sep 2020
Accepted
12 Dec 2020
First published
17 Dec 2020

J. Anal. At. Spectrom., 2021,36, 407-415

XAS study of Sn speciation in toothpaste

M. Desmau, M. A. Alsina and J. Gaillard, J. Anal. At. Spectrom., 2021, 36, 407 DOI: 10.1039/D0JA00392A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements