PEG linker

Buy PEG Linkers: Monodisperse & Polymeric Pegylation Reagents

PEGylation is one of the most effective methods for modifying biological molecules, improving solubility, and extending circulation half-lives in bioconjugate chemistry. When you buy PEG linker reagents, you gain precise molecular tools to attach functional groups, therapeutics, or fluorescent tags to proteins, peptides, and small molecules.

Explore our comprehensive selection of functionalized PEG linker compounds designed for bioconjugation, drug delivery systems, and surface modification. For additional research materials, synthetic reagents, and lab supplies, visit the catalog at amino asylum.

What is a PEG Linker and Why Use It?

A PEG linker (polyethylene glycol linker) acts as a flexible, hydrophilic bridge between two chemical entities. Polyethylene glycol chains are biologically inert, non-immunogenic, and highly water-soluble, making them ideal for molecular conjugation.

  • Enhanced Hydrophilicity & Solubility: Adding a PEG chain increases the aqueous solubility of hydrophobic drugs, peptides, and fluorescent probes.

  • Extended In Vivo Circulation: PEGylation reduces renal clearance and masks molecules from enzymatic degradation, increasing overall bioavailability.

  • Reduced Steric Hindrance: Spacer arms allow conjugated functional groups to maintain their binding affinity and structural flexibility without blocking active sites.

Types of PEG Linkers Available

Selecting the correct functional group and chain length is crucial for achieving high conjugation yields. Our inventory covers a broad spectrum of homobifunctional, heterobifunctional, and mono-functionalized linkers:

Linker Class Functional Groups Ideal Applications
Heterobifunctional NHS-PEG-Maleimide, Azide-PEG-Amine Crosslinking two distinct functional groups (e.g., amine to thiol)
Homobifunctional NHS-PEG-NHS, Maleimide-PEG-Maleimide Dimerization or symmetrical polymer networks
Click Chemistry DBCO-PEG-Azide, Alkyne-PEG-Tetrazine Staudinger ligation, copper-free click reactions
Cleavable Linkers Disulfide (S-S) PEG, Ester-PEG Targeted intracellular release in antibody-drug conjugates (ADCs)

Advantages of Buying Monodisperse PEG Linkers

When sourcing PEG reagents for sensitive research, chain-length uniformity directly impacts experimental reproducibility.

  1. Exact Molecular Weight: Unlike polydisperse polymers, monodisperse PEG linkers have a defined chain length (e.g., $PEG_4$, $PEG_8$, $PEG_{12}$), ensuring consistent stoichiometry.

  2. High Chemical Purity: Rigorously tested via NMR and HPLC to eliminate unfunctionalized or improperly capped side products.

  3. Versatile Reactivity: Options compatible with standard aqueous buffers, organic solvents, and automated synthesis setups.