3.5.1.22 18 - pantothenic acid 10 mM sodium diphosphate/H2SO4, pH 7.5 171981 3.5.1.22 22 - pantothenic acid 10 mM Tris/H2SO4, pH 7.5 171981 3.5.1.22 24 - pantothenic acid 10 mM Tris/10 mM citric acid(KOH), pH 7.5 171981