N-hydroxysuccinimide (NHS) ester-activated PEG linker is an amine-reactive reagent that can be used to modify proteins, peptides, or any other surface with available amino groups. The NHS ester reacts effectively with the primary amino group (-NH2) in a neutral or weakly alkaline buffer to form a stable amide bond. Because antibodies and other proteins often contain multiple lysine (K) residues in addition to the N-terminus of each polypeptide, they have multiple primary amines that can be targeted with NHS-activated PEG reagents.

Biopharma PEG offers the following PEG NHS ester. Different kinds of PEG NHS ester products may be available by custom synthesis.

Catalog No.	Name	Structure	M.W.	Purity	Buy
MF001023	mPEG-SC			≥95%	BUY
MF001024	mPEG-SCM			≥95%	BUY
MF001025	mPEG-SPA			≥95%	BUY
MF001026	mPEG-SBA			≥95%	BUY
MF001027	mPEG-SG			≥95%	BUY
MF001028	mPEG-SS			≥95%	BUY
MF001029	mPEG-GAS			≥95%	BUY
MF001030	mPEG-SAS			≥95%	BUY
MF001058	mPEG-SVA			≥95%	BUY
MF001032	mPEG-SS-NHS			≥95%	BUY
HO023023	NHS-PEG-NHS			≥95%	BUY
HO024024	SCM-PEG-SCM			≥95%	BUY