3-mercaptopropionic acid

3-Mercaptopropionic acid (CAS 107-96-0), also known as beta-mercaptopropionic acid and abbreviated as 3-MPA, is a bifunctional thiol acid used across polymer chemistry and pharmaceutical synthesis. Its dual reactive sites, a thiol group and a carboxylic acid, make it a practical building block and chain transfer agent in industrial processes and food flavoring applications.

In polymer manufacturing, 3-MPA acts as a chain transfer agent during free-radical polymerization, allowing formulators to control molecular weight in acrylic and vinyl-based resins. The pharmaceutical and biotech sectors use it as a linker or intermediate in peptide conjugation and nanoparticle surface functionalization, particularly in gold nanoparticle synthesis.

Assigned FEMA 4587, it is approved as a flavoring agent in food applications where sulfur-containing compounds contribute to meat, savory, and roasted flavor profiles. It also functions as a catalyst precursor and stabilizer in PVC processing, where it supports organotin-based heat stabilizer formulations for industrial manufacturing.

3-Mercaptopropionic acid is supplied as a clear to pale yellow liquid. Standard commercial grades include technical and high-purity variants to meet specific synthesis requirements. Pharmaceutical-grade material is available for bioconjugation needs. Packaging typically ranges from small laboratory quantities up to bulk drum supply for large-scale operations.