MES monohydrate
Synonyms: MES or 2-(N-morpholino)ethanesulfonic acid or 4-morpholineethanesulfonic acid monohydrateC6H13NO4S • H2OMr 213.25CAS Number [145224-94-8]EC Number 224-632-3Beilstein Registry Number 329824236RTECS QE3479500MDL Number MFCD00149409PubChem Substance ID 24885996Purity ≥ 99.0%pKa 6.1 at 25°C
Solutions are stable at 2-8°C for months. Autoclaving is not recommended for any sulfonic acid buffer. When MES solutions are autoclaved, they turn yellow (although pH does not change measurably). The identity of the yellow breakdown product is unknown. When MES solutions are stored at room temperature, they can turn yellow within six months.
Useful pH range of MES 5.2 - 7.1
Titrate HR2-587 to the desired pH using NaOHHR2-587 Measured pH Range: 3.2 - 3.4 at 25°CHR2-587 Measured Conductivity Range: 166.4 - 2440 µS/cm at 25°CHR2-587 Measured Refractive Index Range: 1.34655 - 1.34731 at 20°C
HR2-787 has been titrated to pH 6.5 using NaOHHR2-787 Measured Conductivity Range: 19.2 - 25.6 mS/cm at 25°CHR2-787 Measured Refractive Index Range: 1.36113 - 1.36251 at 20°C
HR2-943-07 - MES monohydrate pH 5.8 - 1.0 M solution is a Custom Shop reagent and is used to reproduce and optimize Crystallization Reagents for use with the Silver Bullets kit.
Impurities:Endotoxin ≤ 50 EU/gYeast and Mold ≤ 100 CFU/gBioburden ≤ 100 CFU/gAl ≤ 5.0 ppmAs ≤ 3.0 ppmBa ≤ 5.0 ppmBi ≤ 5.0 ppmCa ≤ 20.0 ppmCd ≤ 5.0 ppmCo ≤ 5.0 ppmCr ≤ 5.0 ppmCu ≤ 5.0 ppmFe ≤ 5.0 ppmLi ≤ 5.0 ppmMg ≤ 5.0 ppmMn ≤ 5.0 ppmMo ≤ 5.0 ppmNa ≤ 20.0 ppmNi ≤ 5.0 ppmPb ≤ 5.0 ppmSb ≤ 5.0 ppmZn ≤ 5.0 ppm
