PharmaGrade, USP, Manufactured under appropriate GMP controls for pharma or biopharmaceutical production.

α-Monothioglycerol, α-Thioglycerol, 3-Mercapto-1,2-propanediol
Linear Formula:
CAS Number:
Molecular Weight:
Beilstein/REAXYS Number:
EC Number:
MDL number:
PubChem Substance ID:
Pricing and availability is not currently available.

Quality Level

biological source




product line



97.0-101.0% (calc. on anhydrous basis, T)




residual solvents, complies
≤0.002% heavy metals
≤5.0% water

ign. residue


refractive index

n20/D 1.521-1.526
n20/D 1.527 (lit.)




118 °C/5 mmHg (lit.)


1.241-1.250 g/mL at 20 °C
1.25 g/mL at 25 °C (lit.)

cation traces

Se: ≤0.003%


suitable for manufacturing use

SMILES string




InChI key


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General description

PharmaGrade products are manufactured under appropriate controls for use as a raw material in pharma or biopharmaceutical production. For more information on the PharmaGrade Program, visit sigma-aldrich.com/safc-pharmagrade.


Skull and crossbones

Signal Word


Hazard Statements


UN 2810 6.1 / PGIII

WGK Germany


Flash Point(F)

210.2 °F - closed cup

Flash Point(C)

99 °C - closed cup

  1. Which document(s) contains shelf-life or expiration date information for a given product?

    If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis.

  2. How do I get lot-specific information or a Certificate of Analysis?

    The lot specific COA document can be found by entering the lot number above under the "Documents" section.

  3. How do I find price and availability?

    There are several ways to find pricing and availability for our products. Once you log onto our website, you will find the price and availability displayed on the product detail page. You can contact any of our Customer Sales and Service offices to receive a quote.  USA customers:  1-800-325-3010 or view local office numbers.

  4. What is the Department of Transportation shipping information for this product?

    Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product. 

  5. What is the concentration of the 1-thioglycerol?

    The liquid is not a solution of 1-thioglycerol in some solvent. Rather, it is a neat liquid (i.e., essentially pure 1-thioglycerol). Based on a density of 1.245 g/mL and a molecular weight of 108.2 g/mole, one can calculate an effective molarity of 11.5 M. This information may be found on the M1753 product information sheet.

  6. My question is not addressed here, how can I contact Technical Service for assistance?

    Ask a Scientist here.

  7. My question is not addressed here, how can I contact Technical Service for assistance?

    Ask a Scientist here.

Nadja Franz et al.
Organic & biomolecular chemistry, 7(24), 5207-5218 (2009-12-22)
Hydrophilic/hydrophobic patterning is a powerful strategy to control folding in non-natural polymers/oligomers. In this contribution, we present a novel strategy for the preparation of alternating hydrophilic/hydrophobic patterned non-natural peptide foldamers. This strategy relies on the post-modification of a reactive peptide...
S Kanagaraja et al.
Journal of biomedical materials research, 46(4), 582-591 (1999-07-09)
Monolayers of glutathione (GSH) and 3-mercapto-1,2-propanediol (MG) on gold were tested for their bioreactivity by assessing the degree of inflammatory reaction as manifested by the adherence and activation of platelets and white blood cells (wbc) after exposure to blood ex...
Doron Burshtain et al.
Physical chemistry chemical physics : PCCP, 8(1), 158-164 (2006-02-17)
The difference in the heterogeneous binding of Mg(2+), Ca(2+) and Sr(2+) ions by 1-thioglycerol (TG) and 1,4-dithiothreitol (DTT) spontaneously adsorbed monolayers on Au has been studied following the changes in the double layer capacity. A mathematical treatment, based on calculating...
L Tang et al.
Journal of biomedical materials research, 41(2), 333-340 (1998-06-25)
Biomaterial-mediated complement activation repeatedly has been invoked as a trigger of phagocyte reactions and inflammation. However, a direct correlation between complement activation and inflammatory responses to biomaterial surfaces has yet to be established. Using an animal implantation model and gold...
C Unni et al.
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 71(4), 1402-1407 (2008-06-11)
Nanoparticles of CdS were prepared at 303 K by aqueous precipitation method using CdSO4 and (NH4)2S in presence of the stabilizing agent thioglycerol. Adjustment of the thioglycerol (T) to ammonium sulphide (A) ratio (T:A) from 1:25 to 1:3.3 was done...

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