15-Hexadecynoic acid | CAS 99208-90-9

15-Hexadecynoic acid is a long-chain alkyne fatty acid designed for bioorthogonal and click chemistry workflows, most commonly serving as a terminal alkyne handle for copper(I)-catalyzed azide–alkyne cycloaddition (CuAAC) and related conjugation strategies. Its amphiphilic, lipid-like structure enables incorporation into membrane-associated systems, lipid assemblies, and metabolic labeling contexts, while the alkyne functionality provides a robust chemical tag for downstream attachment of imaging dyes, affinity ligands, or functional biomolecules. As a research-grade reagent, 15-Hexadecynoic acid is widely used to generate clickable lipid analogs and to spatially map or quantify lipid distribution and trafficking in chemical biology and biomaterials studies.

1. Lipid Metabolic Labeling

15-Hexadecynoic acid is frequently used to introduce an alkyne-functional lipid motif into cellular lipid pools, enabling subsequent CuAAC-based tagging with azide-bearing probes. Researchers employ this approach to visualize and compare lipid remodeling across experimental conditions, to track subcellular localization of lipid classes, and to build clickable lipid standards for analytical workflows. The long-chain nature of 15-Hexadecynoic acid supports compatibility with lipid uptake and membrane partitioning, making it a practical choice for studies that require chemical control over where the clickable handle resides within complex biological membranes.

2. Membrane Imaging Probes

15-Hexadecynoic acid is well suited for generating membrane-associated imaging materials through post-labeling with fluorescent or affinity-functional azides. After incorporation into lipid bilayers or supported membrane systems, the alkyne handle allows researchers to attach dyes, quencher pairs, or other optical reporters via click chemistry, supporting microscopy-based mapping of membrane domains and surface accessibility. This reagent is also used to create clickable lipid layers for imaging assay development, where consistent alkyne density and lipid-like behavior are important for reproducible probe placement at interfaces.

3. Biomaterial Surface Functionalization

15-Hexadecynoic acid is commonly applied to functionalize hydrophobic or lipid-mimetic surfaces with a terminal alkyne for subsequent conjugation. In biomaterials research, the reagent can be used to incorporate clickable moieties into coatings, polymer–lipid hybrids, or self-assembled interfacial layers, enabling later attachment of azide-functional biomolecules such as peptides, carbohydrate motifs, or affinity tags. By using 15-Hexadecynoic acid as an alkyne-bearing linker precursor, teams can tailor surface chemistry for platform development in chemical biology tools, biosensing interfaces, and materials used for probing molecular interactions at defined surfaces.

4. Affinity Tagging and Pull-Down

15-Hexadecynoic acid supports click-based affinity workflows where alkyne-bearing lipid analogs are converted into azide-reactive conjugates for capture and enrichment. After labeling lipid-containing samples, researchers use CuAAC to attach biotin, solid-support binding handles, or other affinity tags, enabling pull-down of lipid-associated components for downstream analysis such as mass spectrometry sample preparation or targeted enrichment of lipid-binding partners. The lipid-like character of 15-Hexadecynoic acid helps maintain compatibility with lipid extraction and fractionation schemes, which is valuable when the goal is to isolate clickable lipid species and their associated molecular assemblies.

5. Lipid-Responsive Materials and Sensors

15-Hexadecynoic acid is used as a building block for constructing lipid-responsive materials where clickable chemistry provides modular control over functionalization. By integrating 15-Hexadecynoic acid into lipid-containing matrices or amphiphilic assemblies, researchers can later conjugate azide-functional recognition elements, reporting groups, or catalytic motifs to create assay-ready sensor platforms. This application is particularly relevant for developing chemically addressable interfaces that benefit from the stability of a long-chain alkyne handle and the specificity of click conjugation to install functional components under mild conditions.