Acid-C5-bis-PEG3-azide

Acid-C5-bis-PEG3-azide is a bis-azide, PEGylated click chemistry reagent designed for copper-free and copper-mediated azide-based conjugation workflows. The scaffold combines an acidic C5 linker with two PEG3 arms terminating in azide functional groups, enabling flexible, water-compatible multivalent labeling and surface or biomolecule functionalization. Such bis-azide platforms are commonly used in chemical biology, materials functionalization, and probe development where controlled multivalent attachment improves reagent handling and conjugate stability.

1. Multivalent Biomolecule Labeling

Acid-C5-bis-PEG3-azide is frequently used to introduce two azide handles onto biomolecules, enabling multivalent attachment strategies for fluorescent probes, affinity reagents, and affinity-tagged constructs. Researchers leverage the PEG spacing to reduce steric constraints and to support efficient downstream conjugation with complementary click partners, including cyclooctyne- or strained-alkyne functional groups. The acidic C5 backbone and PEG3 arms also support aqueous compatibility, making the reagent practical for labeling workflows that require consistent solubility and reproducible conjugate formation.

2. Surface And Material Functionalization

Acid-C5-bis-PEG3-azide is well suited for functionalizing polymer surfaces, hydrogel matrices, and other biomaterials that require azide incorporation for subsequent click-based coupling. The bis-azide architecture supports attachment of multiple ligands per reactive site when paired with appropriate click handles, which is valuable for building patterned surfaces, immobilized capture reagents, and modular material coatings. In materials science workflows, the PEG3 spacing helps maintain accessibility of reactive groups after immobilization, supporting robust coupling to alkynyl or cyclooctyne-bearing components.

3. Molecular Probe And Imaging Reagents

Acid-C5-bis-PEG3-azide is commonly incorporated into probe design to provide a defined azide-based attachment point for assembling imaging and detection reagents. The bis-PEG3 framework can be used to create multivalent probe architectures, such as dual-labeled constructs or scaffolded sensor formats, where two clickable sites support controlled assembly with fluorophores, quencher units, or targeting moieties bearing complementary click chemistry. This reagent’s water-compatible PEG character is particularly helpful for preparing probe conjugates intended for demanding labeling and purification sequences in chemical biology laboratories.

4. Diagnostic Reagent Conjugation

Acid-C5-bis-PEG3-azide is used in diagnostic reagent development to generate azide-functional intermediates for assembling assay components through click-based conjugation. The bis-azide format enables modular coupling of multiple assay building blocks, such as reporter labels and capture elements, onto a shared scaffold or into a conjugate carrier. By providing PEG-spaced reactive sites, Acid-C5-bis-PEG3-azide supports efficient downstream assembly of reagent conjugates used in research and industrial assay manufacturing workflows, where consistent conjugation geometry and aqueous processability are important.