Abstract
The thermal stability of antimicrobial cationic dyes was studied by differential scanning calorimetry (DSC) and thermogravimetric (TGA) analysis, and their hydrolytic stability was investigated by exposing the dyes in water under different pH conditions and analyzing hydrolyzed products by using electron absorption spectra and NMR analysis. These cationic antimicrobial dyes were stable below 190 °C, but higher temperature led to a two-step thermal decomposition. Both the mono-substituted and the bi-substituted dyes showed higher stability in acidic solutions than in basic conditions, and the highest stability was observed at pH 3. These unexpected results were believed to be related to the unique surfactant features and the positively charged hydrophilic components in the dyes. The structure effects on the stability of the dyes were discussed in detail.
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