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Food safety and quality
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| Flavouring |
2-Mercaptopropionic acid |
| Synonym(s) |
2-Thiolpropionic acid;Thiolactic acid;alpha-Mercaptopropanoic acid |
| Latest JECFA evaluation |
2002 (Session 59) |
| Status of specification |
Full |
| Information required |
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| Chemical name |
2-Mercaptopropionic acid |
| JECFA number |
551 |
| CAS number |
79-42-5 |
| FEMA number |
3180 |
| COE number |
11790 |
| FLAVIS number |
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| Molecular weight |
106.16 |
| Chemical formula |
C3H6O2S |
| Physical form/odour |
colourless to pale yellow liquid with roasted, meaty odour |
| Solubility |
miscible in water, alcohol, ether and acetone |
| Solubility in ethanol |
1 mL in 1 mL 95% alcohol |
| Boiling point (°C) |
117° |
| Assay min % |
95% |
| Acid value max |
|
| Refractive index |
1.479-1.484 |
| Specific gravity |
1.192-1.200 |
| Other requirements |
mp: 10° |
| ID Test |
IR |
| Spectrum |
 
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![](../typo3conf/ext/dyna_fef/download.php?dfile=/work/htdocs/disseminationtypo3/web/fileadmin/user_upload/jecfa/img/<a href="http://www.fao.org/fileadmin/user_upload/jecfa/img/551.gif" target=_blank><img src="http://www.fao.org/fileadmin/user_upload/jecfa/img/551.gif" width="60px;"></a><br>&dname=<a href="http://www.fao.org/fileadmin/user_upload/jecfa/img/551.gif" target=_blank><img src="http://www.fao.org/fileadmin/user_upload/jecfa/img/551.gif" width="60px;"></a><br> "Download")
![](fileadmin/user_upload/jecfa/img/<a href="http://www.fao.org/fileadmin/user_upload/jecfa/img/551.gif" target=_blank><img src="http://www.fao.org/fileadmin/user_upload/jecfa/img/551.gif" width="60px;"></a><br>)