Stability of Methilmethionine Sulfonium Chloride in Aqueous Solution

The decomposition of methyl methionine sulfonium chloride (MMSC) wasstudied inaqueous solution at pH 2-9 at the temperature of 40°, 50° and 60°. The decomposition reactions were found to follow pseudo-first-order kinetics. It became faster in parallel with the rise in pH values. The stability of MMSC in aqueous solution was estimated by the Arrhenius equation. The 90% residual rate of MMSC in aqueous solution at 25° was 15.6 days at pH 2 and 5.1 days at pH 9.