Methoxy PEG Maleimide


PEG products with additional MW may be made to order, please contact us for details


Methoxy PEG Maleimide with superior quality specification of ≥95% Substitution.

Methoxy PEG Maleimide (mPEG-MAL) from JenKem Technology is is a thiol reactive PEG derivative selective for thiol groups on cystein side chains. Methoxy PEG Maleimide undergoes thiol PEGylation reactions with thiol-containing molecules at pH 5.0-6.5. JenKem Technology offers Methoxy PEG Maleimide with MW 2kDa (M-MAL-2000), MW 5kDa (M-MAL-5000), MW 10kDa (M-MAL-10K), MW 20kDa (M-MAL-20K), MW 30kDa (M-MAL-30K) and MW 40kDa (M-MAL-40K) in 1g and 10g packing sizes.

Different MW of Methoxy PEG Maleimide products may be available by custom synthesis, please email us at for details on custom PEGs. JenKem Technology provides repackaging services for an additional fee, please contact us if you require a different package size than our catalog selection.

Bulk PEGs and GMP grade PEGs are made-to-order. Please contact us for bulk pricing.

Click here to download the MSDS


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Founded in 2001 by experts in PEG synthesis and PEGylation, JenKem Technology specializes exclusively in the development and manufacturing of high quality polyethylene glycol (PEG) products and derivatives, and related custom polymer synthesis and PEGylation services. JenKem Technology is ISO 9001 and ISO 13485 certified, and adheres to ICH Q7A guidelines for GMP manufacture. The production of JenKem® PEGs is back-integrated to in-house polymerization from ethylene oxide, enabling facile traceability for regulated customers. JenKem Technology caters to the PEGylation needs of the pharmaceutical, biotechnology, medical device and diagnostics, and emerging chemical specialty markets, from laboratory scale through large commercial scale.

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