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MES hydrate

≥99.5% (titration), pH 2.5-4.0 (0.5 M in H2O), BioXtra

4-Morpholineethanesulfonic acid, 2-(N-Morpholino)ethanesulfonic acid hydrate
Empirical Formula (Hill Notation):
C6H13NO4S · xH2O
Número de CAS:
Peso molecular:
195.24 (anhydrous basis)
Número MDL:
ID de la sustancia en PubChem:

Nivel de calidad


línea de producto



≥99.5% (titration)


crystalline powder


Insoluble matter, passes filter test

residuo de ign. (900 °C)



2.5-4.0 (0.5 M in H2O)

intervalo de pH útil

5.5 - 6.7




H2O: 0.5 M, clear, colorless

trazas de anión

chloride (Cl-): ≤0.005%

trazas de catión

Al: ≤0.0005%
As: ≤0.0001%
Ba: ≤0.0005%
Bi: ≤0.0005%
Ca: ≤0.002%
Cd: ≤0.0005%
Co: ≤0.0005%
Cr: ≤0.0005%
Cu: ≤0.0005%
Fe: ≤0.0005%
K: ≤0.005%
Li: ≤0.0005%
Mg: ≤0.0005%
Mn: ≤0.0005%
Mo: ≤0.0005%
Na: ≤0.005%
Ni: ≤0.0005%
Pb: ≤0.0005%
Sr: ≤0.0005%
Zn: ≤0.0005%


≤0.020 at 280 in H2O at 0.5 M
≤0.025 at 260 in H2O at 0.5 M

temp. de almacenamiento

room temp

SMILES string




InChI key


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Descripción general

MES is one of the Good′s buffers, the most extensively used biological buffers. MES is a zwitterionic N-substituted aminosulfonic acid with a morpholinic ring. It does not form complexes with majority of the metals used in environmental and biological studies. It is easily soluble in water and has minimum lipid solubility, making it impermeable to membranes.


MES Hydrate has been used:
  • As a component of extraction buffer in the extraction of the enzyme BACE1
  • As a component of the reaction mixture for the measurement of 5,10-methenyltetrahydrofolate synthetase (MTHFS) enzyme activity in fibroblasts
  • As a component of MES coupling buffer during the coupling of mAb or GST-fusion proteins to carboxylate-modified polystyrene latex (CML) beads


50, 250 g in poly bottle

Nota de preparación

A buffer using MES can be prepared by titrating with NaOH to the desired pH. Alternatively, stock solutions of MES and MES sodium salt can be mixed to attain the desired pH. Standard mixing tables using stock solutions to prepare buffers of a given pH have been published. MES is not recommended for buffering at pH 7.4; other buffers should be considered.

Almacenamiento y estabilidad

Solutions are stable at 2-8 C for months. Sterilize by filtration through 0.2uM filters. Autoclaving is not recommended for any sulfonic acid buffer. If buffers must be nuclease-free, treat the water first, and then add the buffer after autoclaving. When MES solutions are autoclaved, they turn yellow (although pH does not change measurably). The identity of the yellow breakdown product is unknown.

Otras notas

Solubility: MES is soluble in water, giving a clear colourless solution at concentrations of 0.5M or higher. Similar product MES hydrate M8250 is tested at 20g/80mL water, or 1.3M. The pH of a solution should be between 2.5 and 5, depending on the concentration. A saturated solution at 0°C is approximately 0.65M.
Easily compare specifications for MES products with the MES specification table.

Código de clase de almacenamiento

13 - Non Combustible Solids



Punto de inflamabilidad F

Not applicable

Punto de inflamabilidad C

Not applicable

Equipo de protección personal

Eyeshields, Gloves

Certificado de Análisis

Certificado de origen

5, 10-methenyltetrahydrofolate synthetase deficiency causes a neurometabolic disorder associated with microcephaly, epilepsy, and cerebral hypomyelination.
Rodan, LH et al.
Molecular Genetics and Metabolism, 125, 118-126 null
High-sensitivity detection and quantitative analysis of native protein-protein interactions and multiprotein complexes by flow cytometry.
Schrum AG, et al.
Science Signaling, 2007 (389), pl2-pl2 (2007)
The Swedish APP mutation alters the effect of genetically reduced BACE1 expression on the APP processing.
Rabe S, et al.
Journal of Neurochemistry, 119 (1), 231-239 (2011)
"(Un) suitability of the use of pH buffers in biological, biochemical and environmental studies and their interaction with metal ions-a review.
Ferreira, CMH, et al.
Royal Society of Chemistry Advances, 5 (39), 30989-31003 (2015)
Good, Norman E. et al.
Biochemistry, 5, 467- 477 (1966)

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