MES Free Acid (2-(N-Morpholino) ethanesulfonic acid)

MES Free Acid is a biological buffer (zwitterionic) designed by Good, et al., and typically referred to as Good's buffer useful in cell culture media formulations. Selection of biological buffer systems should include the following criteria: exclusion by biological membranes, low absorption between 240 and 700nm, chemically stable, and stable to temperature and concentration changes. Synonyms: 2-(4-Morpholino)ethanesulfonic Acid, 2-(4-Morpholinyl)ethanesulfonic Acid, 2-(N-Morpholino)ethanesulfonic Acid, 2-Morpholinoethanesulfonic Acid, MES, Morpholinoethanesulfonic Acid, NSC 157116, CAS Number: 4432-31-9, Molecular Formula: C?H??NO?S, Molecular Weight: 195.24, Appearance: White crystalline powder, Purity: >99%, Identity (IR): Conforms to reference, Solubility (10%): Colorless, clear, complete, Water (KF): <10%, pH (1%): 3.5-4.1, Useful pH Range: 5.5 - 6.7, Absorbance (A260): <0.1, Absorbance (A280): <0.1, Heavy Metal (Pb): <0.0003%, Iron (Fe): <0.0005%, DNase: None Detected, RNase: None Detected, Protease: None Detected, Storage: RT