Product Category


ICH-Q7 GMP Manufactured Product

MES, Hydrate, GMP Excipient Grade

Product Code: MESH-3201

Intended For Use In Pharmaceutical GMP Processes/Excipient

MES Hydrate is a zwitterionic buffer that is not absorbed through cell membranes and is virtually transparent in UV light. MES is a buffering agent used in many biological and biochemical applications. It is also used as a running buffer for denaturing gel electrophoresis. The characteristics of low UV absorptivity, minimal reactivity, stable pH and solubility in water allow MES Hydrate Excipient to be used as a Good’s buffer.

Product Specifications

Appearance (Color)  
Appearance (Form)  
Crystalline Powder
Solubility (Color)  

Solubility (Turbidity)
20g plus 80ml of H2O

Infrared Spectrum  
Conforms to Structure
Water (by Karl Fischer)  
≤ 9%

A290 UV absorbance 20%

≤ 0.05 a.u.

Trace Metals (ICP-MS),
Silver (Ag), Arsenic (As),
Bismuth (Bi), Cadmium (Cd),
Copper (Cu), Mercury (Hg),
Molybdenum (Mo), Lead (Pb),
Antimony (Sb), and Tin (Sn)

Sum ≤ 5ppm
0.5M in H2O
2.5 – 4.0
1.0M in H2O
2.7 – 3.7
Titration with NaOH
≥ 99.5%

Impurity PVS Limit Test


≤ 1 ppm

Printable Version
List of C of As files
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General Product Description:

  • The manufacturing of Bio Excipient Grade MES, Hydrate MESH-3201 is performed at BioSpectra’s Bangor, PA facility utilizing multiuse equipment. Equipment used in the manufacturing of Bio Excipient Grade MES, Hydrate is cleaned in accordance with BioSpectra’s Cleaning Validation Plan.
  • MES, Hydrate is a White Crystalline product.
  • Molecular Formula: C6H13NO4S·xH2O
  • Molecular Weight: 195.24 (anhydrous base).
  • CAS Number: 1266615-59-1.
  • There are no known major food allergens (as defined by FDA and WHO) in the manufacture of this product.
  • BioSpectra certifies that all MES, Hydrate MESH-3201 manufactured at BioSpectra and its raw materials are not derived from or come in contact with animal parts, products, and/or byproducts.
  • MES, Hydrate manufactured at BioSpectra and any raw materials used in the manufacture of MES, Hydrate at BioSpectra are not subject to genetic modification.
  • Synonyms: 4-Morpholineethanesulfonic acid, 2-(N-Morpholino)ethanesulfonic acid hydrate.

GMP Compliance:

Bio Excipient Grade MES, Hydrate MESH-3201 is suitable for use as an excipient. It is manufactured in accordance with the ICH-Q7 Good Manufacturing Practice Guide. This grade of MES, Hydrate is not suitable to be used as an Active Pharmaceutical Ingredient, Drug Product or Household Item.

Retest Date:

The recommended retest period for MES, Hydrate is two years from the date of manufacture.

Storage and Shipping Conditions:

Ship and Store in ambient temperature.

Package Sizes:

10kg, 25kg and 50kg pails.

Additional Packaging Information