mPEG-Amine is a linear methoxy PEG reagent with a reactive primary amino or NH2 group. Amine can rapidly react with activated carboxyl acid such as NHS ester to form stable amide bonds. Amine can also react with carbonyl such as ketone and aldehyde. mPEG-Amine with MW at 1k or higher appears as white powder and at lower MW (e.g. 550 and 350) appears as white or off-white semi-solid or wax-like due to their low melting/freezing temperature range (e.g. mPEG MW 550 at 15-25 Celsius). mPEG-Amine is in its free amine form. If you require the salt form (HCl or TFA), please contact us.
Molecular weight: MW of PEG was measured by MALDI-MS or GPC. PDI (polydispersity index) of our linear PEG is 1.02-1.05 with very narrow MW distribution. The number of repeating ethylene oxide units (CH2CH2O) or the degree of polymerization is calculated dividing the PEG MW by 44 (44 is the molecular mass of one repeating unit).
Solubility: Soluble in water and aqueous buffer, chloroform, methylene chloride, DMF, DMSO, and less soluble in alcohol, toluene. Not soluble in ether.
Density: PEG density is approximately 1.125 g/mL
Physical form: PEG products generally appear as white or off-white powder, and for very low MW linear PEG such as MW 1k or less, it may appear as wax-like, semi-solid material due to the low MW and the type of functional groups.
Storage condition: PEG product shall be stored in the original form as received in a freezer at -20C or lower for long term storage. Stock solution of PEG reagents that do not contain oxygen or moisture sensitive functional groups may be temporarily stored in a refrigerator or ambient temperature for multiple days. Stock solution should avoid repeated freeze-and-thaw cycles. See Documents section for detailed storage and handling conditions.
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