Synonyms: Methoxypolyethylene glycol, mono-Methyl polyethylene glycol, Methoxy poly(ethylene glycol), PEG MME 550, MPEG
CH₃O(CH₂CH₂O)_nH
Average M_n ~550
CAS Number [9004-74-4]
EC Number 215-801-2
RTECS PE8271000
MDL Number MFCD00084416
Purity ≥100%
Melting Point (Starting Material) 20.0°C (lit.)

Aldehyde None detected
Peroxide None detected

Measured Conductivity Range: 0.0 – 1.0 µS/cm at 25°C
Measured Refractive Index Range: 1.46185 – 1.46361 at 20°C

May become highly viscous, develop amorphous, crystalline precipitate, or take on a gel like consistency at temperatures below 20 degrees Celsius. Warm product to 60 degrees Celsius for up to 24 hours, mix well, to dissolve amorphous, crystalline precipitate.

100% Polyethylene glycol monomethyl ether 550

1. Poly(ethylene) glycol monomethyl ethers – an alternative to poly(ethylene) glycols in protein crystallization. A. M. Brzozowski and S. P. Tolley. Acta Cryst. (1994). D50, 466-468.

2. Crystal structure of ethylbenzene dehydrogenase from Aromatoleum aromaticum. Daniel P. Kloer, Corina Hagel, Johann Heider and Gerog E. Schulz. Structure 2006 Volume 14 Number 9, 1377-1388.

Hampton Research, first in crystallization since 1991, developing and delivering crystallization and optimization screens, reagents, plates, and other tools for the crystallization of biological macromolecules, including proteins (antibody), peptides (insulin), and nucleic acids (DNA).

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