Linear Aldehyde PEGs from JenKem Technology are amine reactive PEGs towards the N-terminal amine. Methoxy PEG Propionaldehydes react at pH 5-8 in the presence of a reducing reagent. M-ALD-20K is a PEG raw material for Pegfilgrastim PEGylated biosimilars. Aldehyde PEGylation products with molecular weights, branching, and functional groups not listed in our online catalog may be available by custom synthesis. Please inquire at email@example.com about pricing and availability of custom PEGylation products. Bulk PEGs and GMP PEGs are also available upon request. Please contact us for special bulk pricing.