XAS study of Sn speciation in toothpaste

Morgane Desmau, Marco A. Alsina, Jean François Gaillard*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish (US)
Pages (from-to)407-415
Number of pages9
JournalJournal of Analytical Atomic Spectrometry
Volume36
Issue number2
DOIs
StatePublished - Feb 2021

ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy

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