NHS ester PEG

NHS ester PEG is a compound with a PEG chain and an NHS ester functional group. The N-hydroxysuccinimide (NHS) ester-activated PEG ligand is an amine-responsive reagent that can be used for modifying proteins, peptides, or any other surfaces that have an available amino group. The NHS ester reacts efficiently with primary amino groups in neutral or weakly alkaline buffers to form stable amide bond. In addition to the N-terminus of each peptide, antibodies and other proteins typically contain multiple lysine (K) residues. NHS-activated PEG reagents can therefore be used to target multiple primary amines.

Examples of NHS ester PEGFig. 1. Examples of NHS ester PEG.

Structural Features of NHS ester PEG

  • PEG chain: The PEG chain is characterized by high solubility, hydrophilicity, low toxicity, high biocompatibility and structural tunability.
  • NHS ester functional group: NHS ester (N-hydroxysuccinimide ester) is formed by the reaction of succinic acid and hydroxybutyrate. The NHS ester functional group is often used in biochemistry to react with amino compounds to form amino ester bonds.
  • Hydroxybutyrate chain: The terminal hydroxybutyrate chain of NHS ester PEG is the part that reacts with the target compound. It can form amino ester bonds with biomolecules containing amino groups.

Examples of NHS ester PEG


Biotin-PEG-NHS has biotin and NHS esters at each end of the molecular chain and can be used to label proteins, antibodies, small molecules or surfaces with available amine groups. At pH 7-9, the NHS ester reacts rapidly with primary amine groups to form stable amide bonds.


DSPE-PEG-NHS can provide NHS groups for affixation to amine-containing portions or ligands. Its target molecules include antibodies, aptamers, proteins, and peptides, and are commonly used to deliver targeted drugs through lipid bilayers, extend circulating half-life, and reduce non-specific protein binding or cell adhesion.


MAL-PEG-NHS is a heterogeneous bifunctional modifier. It is mostly used in targeted drug research and has a wide range of applications in cross-linking of protein carriers and ligands.


NHS-PEG-Plys is a biodegradable polymer organic compound. Plys is rich in cations and has good membrane properties. Based on this property, Plys can be used as carriers for certain drugs and are therefore widely used in medical and pharmaceutical applications. NHS-PEG-Plys can be easily doped into liposomes and other nanoparticles via the NHS-amine reaction.

Functions of NHS Ester PEG


NHS ester PEG can be used as a biomarker reagent for attaching PEG molecules to biomolecules. This PEG labeling can alter the properties of the biomolecule, such as increasing its solubility, stability, and cyclic half-life.

Surface Modification

NHS ester PEG can be used to surface modify materials. By attaching PEG molecules to the surface of a material, non-specific interactions between the material and the organism can be reduced, thus enhancing its performance in biomedical applications.

Resistance to Protein Adsorption

PEG has good hydrophilicity and can form a hydrated layer that prevents proteins from coming into direct contact with the surface of the material, thereby reducing the potential for non-specific adsorption and biodegradation.

Advantages of NHS ester PEG

  • High Reactivity - The NHS ester functional group reacts very rapidly under alkaline conditions with compounds containing amino groups (NH2) to form stable amino ester bonds.
  • Enhanced Stability - For biomolecules, PEG labeling can increase their cycle time and stability, prolonging their in vivo action.
  • Convenient Chemical Modification - NHS ester PEG can be introduced into target compounds by reacting with compounds containing amino groups. This chemical modification method is simple and convenient and can be performed under laboratory conditions, providing flexibility and maneuverability for a variety of applications.

BOC Sciences offers high-quality PEG products with low polydispersity, high reactivity, and high purity. BOC Sciences' PEG products include PEG derivatives by structure, PEG derivatives by functional group, PEG raw materials, PEG copolymers, and more. If you are interested in our products, please feel free to contact us.

Why BOC Sciences?

  • Large Stock

    More than 2000+ products in inventory

  • Global Delivery

    Warehouses in multiple cities to ensure fast delivery

  • mg to kg

    Multi specification for academic research and industrial production

  • 24/7 Technical Support

    Strict process parameter control to ensure product quality



Our Feature

BOC Sciences supplies a unique variety of PEG derivatives and functional PEG polymers. Our products offer the most diverse collection of reactivity, ready-to-use functionality, and molecular weight options that you will not find anywhere else.

  • Our Feature icon1
  • Our Feature icon2
  • Our Feature icon3
  • Our Feature icon4
PEGylation of Peptides and Proteins

PEGylation of Peptides
and Proteins

Reduce the Immunogenicity of Peptide/Protein Drugs

Learn More



PEG linkers For Drug

Improved Circulation Half-Life

Learn More

Have Customer Reviewed On Us?


Chat With Us

Online Inquiry

Verification code

Copyright © 2024 BOC Sciences. All rights reserved.