Amino-PEG4-acid is a very popular PEG linker. The amino group (NH2) is reactive with carboxylic acids, activated NHS esters, carbonyls (ketone, aldehyde) etc. The terminal carboxylic acid can react with primary amine groups of activated NHS ester to form a stable amide bond, long PEG spacer increases reagent's solubility in aqueous media. Reagent grade, for research purpose. Please contact us for GMP-grade inquiries.
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