MES, CAS# 145244,94-8, 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 that is used as a buffering agent in many biological and biochemical applications. This Good's buffer is useful in maintaining pH. It is not absorbed through cell membranes and is virtually transparent in UV light.

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
MOPS, Free Acid	C₇H₁₅NO₄S	1132-61-2
MOPS, Free Acid	C₇H₁₅NO₄S	1132-61-2
HEPES, Free Acid	C₈H₁₈N₂O₄S	7365-45-9

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.