B°C-aminooxy-PEG4-alkyne

B°C-aminooxy-PEG4-alkyne is a bifunctional PEG-based click chemistry reagent that combines an aminooxy handle with a terminal alkyne for orthogonal conjugation workflows. The aminooxy group is commonly used for oxime formation with carbonyl-bearing partners, while the alkyne enables copper-catalyzed azide–alkyne cycloaddition (CuAAC) to install imaging tags, affinity handles, or material-binding motifs. Its PEG4 spacer improves solubility and reduces steric constraints, making it a practical linker for building modular bioconjugates used in chemical biology, molecular imaging, and diagnostic reagent development.

1. Oxime–Click Bioconjugates

B°C-aminooxy-PEG4-alkyne is widely used to generate modular bioconjugates where a carbonyl-functional biomolecule or surface is first converted to an oxime and then further diversified through CuAAC. Researchers and probe developers use this strategy to attach fluorescent dyes, affinity tags, or enrichment groups while maintaining a flexible PEG spacer that helps preserve binding and labeling accessibility. The aminooxy moiety provides a robust attachment point to aldehyde- or ketone-containing targets, and the terminal alkyne supports downstream “click” installation of reporter payloads for assay development and platform screening.

2. Molecular Imaging Probe Building

B°C-aminooxy-PEG4-alkyne supports the assembly of imaging reagents that require sequential functionalization steps, particularly when a biomolecule is pre-functionalized with a carbonyl group prior to conjugation. Imaging-focused chemical biology groups use the aminooxy–oxime linkage to secure the probe scaffold and then use the alkyne handle to click on imaging reporters such as fluorophores or other detectable tags. The PEG4 spacer is especially valuable for improving probe solubility and minimizing nonspecific interactions during probe preparation and characterization, which is important for consistent performance in labeling workflows and imaging reagent pipelines.

3. Diagnostic Reagent Surface Functionalization

B°C-aminooxy-PEG4-alkyne is used in diagnostic reagent development to create stable, modular linkers for immobilizing biomolecular capture elements onto solid supports. Many workflows begin with oxime formation to attach the reagent to aldehyde-functional surfaces or carbonyl-derivatized reagents, followed by CuAAC to introduce azide-bearing detection components, nanoparticles, or assay labels. The PEG4 chain helps maintain spacing between the surface and the reactive or binding regions, which can improve accessibility of capture and reporter groups in multiplexed assay formats and reagent manufacturing settings.

4. Targeted Affinity and Enrichment Tools

B°C-aminooxy-PEG4-alkyne is commonly incorporated into affinity and enrichment constructs used in biochemical workflows, including pull-down reagents and analytical labeling tools. The aminooxy group enables attachment to carbonyl-containing ligands, polymers, or derivatized biomolecules, while the terminal alkyne allows rapid installation of azide-functional affinity motifs such as biotin analogs, chromatographic handles, or detection tags. This two-handle design supports iterative optimization of reagent architecture, allowing teams to rapidly swap reporter or enrichment components without reworking the initial conjugation step, which is valuable for method development and reagent prototyping.