4-arm Poly(ethylene glycol) carboxylic acid (4-Arm PEG-COOH) from Advanced BioChemicals (ABC) are high quality multi-arm PEG derivatives with carboxylic acid at each terminal of the four arms that is good cross-linker with peptide and protein through selective conjugation with activated amino group. There is a methylene linkage (CH2) between the PEG and the acid. The total molecular weight of 4-Arm PEGs is the sum of the molecular weights of all four arms.
Advanced BioChemicals (ABC) offer 4-Arm PEG-COOH with MW 2kDa, MW 5kDa, MW 10kDa, MW 20kDa and MW 40kDa, in 1g, 5g and 10g packing sizes. Different MW of 4-Arm PEG-COOH products may be available by custom synthesis, please email us at email@example.com for details. Advanced BioChemicals (ABC) also provide repackaging services, please contact us at firstname.lastname@example.org for a free quote.