Methoxy PEGs - Thiol Reactive

Linear Thiol Reactive PEGs from JenKem Technology. High quality activated PEGylation products for reaction with thiol or sulfhydryl groups.

Methoxy PEG Maleimide is selective for thiol groups on cystein side chains of proteins. Methoxy PEG Thiol is a thiol reactive PEG towards HS groups on cysteine side chains under mild reaction conditions. Methoxy PEG Vinylsulfone is a sulfhydryl reactive PEG that reacts at high pH.

Thiol Reactive PEGs with molecular weights, branching, and functional groups not listed in our online catalog may be available by custom synthesis. Please inquire at about pricing and availability of custom PEGs for thiol PEGylation.

JenKem Technology provides GMP grade PEG derivatives and bulk orders via custom synthesis, offering the opportunity to match customers’ special quality requirements. JenKem Technology is capable of development and synthesis of a wide range of GMP PEG derivatives starting at 200g up to 40 kg or greater batches, under ISO 9001 and ISO 13485 certified quality management system, following ICH Q7A guidelines. For inquiries on cGMP production of PEG derivatives please contact us at

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