3-Mercaptopropionic acid
CAS 107-96-0
EC 203-537-0
Formula C3H6O2S
MW 106.14 g/mol
Organic Acids Pharmaceuticals & HealthcareFood & NutritionPlastics & PolymersBiotechnology & Life Sciences Preservation & BiocideCatalysisFlavoring & AcidulantpH Regulation & Buffering
Description
3-Mercaptopropionic acid (CAS 107-96-0), also known as 3MPA, 3-thiopropionic acid, and beta-thiopropionic acid, is a short-chain organosulfur acid carrying both a thiol and a carboxylic acid group. It carries no assigned E-code and is classified under HS code 29309070.
In polymer stabilisation, 3MPA acts as a chain-transfer agent and reducing co-catalyst, controlling molecular weight during free-radical polymerisation. In food and flavour applications, the thiol group contributes sulfurous top notes to meat and savoury profiles, while the carboxylic acid function provides mild acidulation and pH buffering in formulated systems.
3-Mercaptopropionic acid is available in technical and food-grade qualities, with pharmaceutical-grade material conforming to FCC and relevant Ph.Eur. monograph requirements. It is registered under REACH and supplied in quantities ranging from laboratory packaging to bulk drums. Procurement teams should confirm grade specification against intended application prior to ordering.
In polymer stabilisation, 3MPA acts as a chain-transfer agent and reducing co-catalyst, controlling molecular weight during free-radical polymerisation. In food and flavour applications, the thiol group contributes sulfurous top notes to meat and savoury profiles, while the carboxylic acid function provides mild acidulation and pH buffering in formulated systems.
3-Mercaptopropionic acid is available in technical and food-grade qualities, with pharmaceutical-grade material conforming to FCC and relevant Ph.Eur. monograph requirements. It is registered under REACH and supplied in quantities ranging from laboratory packaging to bulk drums. Procurement teams should confirm grade specification against intended application prior to ordering.
Physical Properties
| Melting Point | 16.8 °C |
| Boiling Point | 111 °C @ Press: 15 Torr |
| Density | 1.218 g/cm³ @ Temp: 21 °C |
| Flash Point | 201 °F |
| Appearance | clear colourless to yellowish liquid after melting |
| Color | White |
| Odor | sulfurous roasted |
| Form | Crystalline Powder, Crystals, and/or Chunks |
| Water Solubility | soluble |
| Vapor Pressure | 0.04 mm Hg ( 20 °C) |
| Refractive Index | n 20/D 1.492(lit.) |
| pH | 2 (120g/l, H2O, 20℃) |
| Log P | -2.3 at 22℃ |
Safety & Handling (Learn More)
Danger GHS05 GHS06 GHS07 GHS08
H
H290H301H311H314H318H332H335H370
P
P234P260P261P262P264P270P271P280P316P317P319P321P330P363P390P405P406P501P264+P265P301+P316P302+P352P304+P340P308+P316P361+P364P403+P233P301+P330+P331P302+P361+P354P305+P354+P338
Trade & Regulatory
| HS Code | 29309070 |
| UN Number | 2922 |
| ADR Class | 8 |
| Packing Group | II |
| WGK (Germany) | 1 |
Other Names
3-sulfanylpropanoic acid3MPA3-thiopropionic acid3-thiopropanoic acid3-MPAβ-Thiopropionic acid
Related Products
Raw Materials
Derivatives
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