2-Morpholinoethanesulfonic acid sodium salt (MES Na)

buffer substance

2-Morpholinoethanesulfonic acid sodium salt (MES Na)
CAS Number:
Molecular Weight:
MDL number:
EC Index Number:

storage conditions

Store at +5°C to +30°C.

Quality Level


8.9-10.1 (20 °C, 10 g/L in H2O)



InChI key


General description

buffer substance


2-Morpholinoethanesulfonic acid sodium salt (MES Na) buffer substance. CAS 71119-23-8, pH 8.9 - 10.1 (10 g/l, H₂O, 20 °C).

Analysis Note

Assay (alkalimetric, calculated on dried substance)≥ 99.0 %Identity (IR-spectrum)passes testAppearancewhite to almost white, fine powder or colorless crystalsAppearance of solution (0.5 mol/l, water)clear and colorless.UV-Absorption (260 nm; 0.5 mol/l; 1 cm; water)≤ 0.05UV-Absorption (280 nm; 0.5 mol/l; 1 cm; water)≤ 0.05Chloride (Cl)≤ 50 ppmSulphate (SO₄)≤ 50 ppmHeavy metals (as Pb)≤ 5 ppmCa (Calcium)≤ 50 ppmCd (Cadmium)≤ 5 ppmCo (Cobalt)≤ 5 ppmCr (Chromium)≤ 5 ppmCu (Copper)≤ 5 ppmFe (Iron)≤ 10 ppmK (Potassium)≤ 50 ppmMg (Magnesium)≤ 10 ppmMn (Manganese)≤ 5 ppmNi (Nickel)≤ 5 ppmPb (Lead)≤ 5 ppmZn (Zinc)≤ 5 ppmDNases (Exo- and endonucleases)non detectableRNasesnon detectableProteasesnon detectableNicking activity≤ 10 %Loss on Drying (105°C)≤ 1.0 %Biological buffer, pKa at 20 °C6.1
Certificate of Analysis
Certificate of Origin

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Contact Technical Service

Social Media

LinkedIn icon
Twitter icon
Facebook Icon
Instagram Icon


Research. Development. Production.

We are a leading supplier to the global Life Science industry with solutions and services for research, biotechnology development and production, and pharmaceutical drug therapy development and production.

© 2021 Merck KGaA, Darmstadt, Germany and/or its affiliates. All Rights Reserved.

Reproduction of any materials from the site is strictly forbidden without permission.