MES, CAS# 145224-94-8, Good's Buffer

MES, Monohydrate

Molecular Fomula: C₆H₁₃NO₄S H₂O
F.W.: 213.25
CAS#: 145224-94-8
pH @ 20° C: 2.5 - 4.5
Useful pH: 5.5 - 6.7
pKa @20° C: 6.1
Solubility in water (g/ml): 0.31


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Description:
MES is a pH buffering compound selected as one of the Good's buffers. It is not absorbed through cell membranes and is virtually transparent in UV light. Because of this, MES is used as a buffering agent in many biological and biochemical applications.

Specifications Product Links

MES Monohydrate

4-Morpholineethanesulfonic acid
C₆H₁₃NO₄S^.H₂O ^ F.W. 213.25 g/mol ^ CAS# 145224-94-8

ANALYSIS		SPECIFICATIONS

		BioUltra MES-13	BioSynthesized MES-12	Bio Reagent MES-11

Appearance and Color		White/Crystals	White/Crystals	White to Off-White/Crystals
Assay		99.5% min.	99.0% min.	98.0% min.
Chloride		0.005% max.
Color (1M, Alkaline)		Colorless	Colorless
Heavy Metals		0.0001% max.
Identification (IR)		Passes Test	Passes Test	Passes Test
pH (5%)		3.1 - 3.3	3.1-3.3
pH (0.5M)		2.5 - 4.5	2.5 - 4.5
pKa		5.9 - 6.3
Residue on Ignition		0.05% max.	0.05% max.
Solubility (5%)		Passes Test	Passes Test
Sulfate		0.005% max.
Absorbance	@ 280	0.020 a.u. max.	0.020 a.u. max.
Absorbance	@ 260	0.020 a.u. max.	0.020 a.u. max.
Trace Metals	Arsenic (As)	0.0005% max.
	Copper (Cu)	0.0005% max.
	Iron (Fe)	0.0005% max.
	Lead (Pb)	0.0005% max.
Enzymes	RNase	None Detected
	DNase	None Detected
	Protease	None Detected

MES MSDS (CAS# 145224-94-8)

MES General Information

"Hydrogen Ion Buffers for Biological Research". Biochemistry 5: 467.

Merck Merck 13, 5925

Product	Molecular	CAS #	Details
MES, Monohydrate	C₆H₁₃NO₄S H₂O	145224-94-8
MOPS, Free Acid	C₇H₁₅NO₄S	1132-61-2
MOPS, Free Acid	C₇H₁₅NO₄S	1132-61-2

Bio Reagent (Good)
Quality tested from approved suppliers of BBS for Industry-Standard use.

Bio Synthesized (Better)
Manufactured in a quality system based facility offering traceability and consistent supply.

Bio Ultra (Best)
Manufactured at BBS to meet the highest quality and regulatory standards.