Product Category

Reagent Grade

MES, Sodium Salt
Ultra Low Water <5 %

Product Code: MESN-5222 | Previously: MN5222

Intended For Use In Commercial Manufacturing, Diagnostic And Laboratory Applications

MES Sodium salt is a zwitterionic salt of the Good’s buffer MES. MES Sodium Salt is easily dissolved in water, contains a mid-range pKa and a useful pH of 5.5-6.5. It is chemically stable with minimal absorption in both UV and visible spectral range. It is only one of three Good’s buffers that can be used for equations using metal ions because it forms weak bonds with Ca, Mg, Mn and has negligible binding with Cu(II). It is suitable for use in electrophoresis, tissue culture media and other molecular biology applications.

Product Specifications

Appearance and Color  
White Crystalline powder 
Assay (dried basis)  
99.0 – 101.5%
Color (1M, alkaline) Colorless
Identification (IR)  
Conforms to Reference
pH (1.0% Soln)  
8.9 – 10.1
PVS Content   
≤ 1 ppm
Solubility (5% Soln)  Passes Test
Water (Karl Fischer)  ≤ 5%
Key Compliance Attributes of Bio Ultra Grade
Suitable for Research and Diagnostic Application
C of A Available for Each Lot
BioSpectra Supply Chain Audit Trail
Product Origin Statement
Customer Quality Audits
Customized Additional Specifications
Enzyme Tested
List of C of As files
No files available right now.

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COAs and Tech Docs



CAS #: 71119-23-8

Formula: C6H12NO4S • Na

Sol. In H2O (g/L): 590

F.W.: 217.22 g/mol

pH @ 20°C: 8.5 - 10.4

Useful pH: 5.5 - 6.5

pKa @ 20˚C: 6.1

General Product Description:

  • MES Sodium Salt is a White Crystalline product.
  • Molecular Formula: C6H12NO4S • Na
  • Molecular Weight: 217.22 g/mol.
  • CAS Number: 71119-23-8.
  • Synonyms: 2-(N-morpholino)ethanesulfonic acid sodium salt.



Material represented by this grade is suitable to be used only as the following: Quality System Manufactured Process Chemical for use in further manufacturing or as a reagent chemical for commercial manufacturing, diagnostic and laboratory research. The material represented by this grade is not suitable to be used as an Excipient, Active Pharmaceutical Ingredient, Drug, Drug Product or household item.

Retest Date:

Two years from date of manufacture, testing and packaging.

Storage and Shipping Conditions:

Ship and Store in ambient temperature.

Package Sizes:

10kg, 25kg and 50kg pails.

Additional Packaging Information