Monothioglycerol CAS 96-27-5 3-Mercapto-1,2-propanediol 99% Clear Liquid Antioxidant Reducing Agent
Monothioglycerol CAS 96-27-5 (3-Mercapto-1,2-propanediol / Thioglycerol)
Product Introduction
Monothioglycerol, also known as 3-mercapto-1,2-propanediol or thioglycerol, is a bifunctional sulfur-containing diol with the formula C3H8O2S. The molecule combines a free thiol group with two hydroxyl groups, giving it unique reducing and solubilizing behavior. Zorui supplies monothioglycerol as a 99% min clear viscous liquid, widely used as an antioxidant, oxygen scavenger and disulfide-cleaving agent in cosmetic, biochemical and polymer applications.
Physical and Chemical Specifications
| Property | Specification |
| Common Name | Monothioglycerol (Thioglycerol, 1-Thioglycerol) |
| CAS Number | 96-27-5 |
| Molecular Formula | C3H8O2S |
| Molecular Weight | 108.16 |
| Assay | 99.0% min |
| Appearance | Colorless to pale yellow clear viscous liquid |
| Density | 1.25 g/cm3 approx. at 25 °C |
| Boiling Point | 118 °C at 5 mmHg |
| Flash Point | Above 110 °C (closed cup) |
| Solubility | Soluble in water, ethanol |
| Odor | Faint characteristic mercaptan odor |
Product Functions
- Antioxidant & Oxygen Scavenger: protects formulations against oxidative degradation.
- Disulfide Reducing Agent: cleaves S-S bonds in keratin and proteins, the basis of hair waving and biochemical reduction.
- Stabilizer: prevents polymerization and oxidation of sensitive organic intermediates.
- Chain Transfer Agent: regulates molecular weight in radical polymerizations.
Application Areas
- Cosmetics & Personal Care: permanent waving and straightening formulations, antioxidant systems for creams and serums.
- Biochemistry & Life Science: protein research reagent for reducing disulfide bridges.
- Organic Synthesis: building block and stabilization agent for sulfur-containing intermediates.
- Photography & Imaging: antioxidant component in processing solutions.
- Industrial Chemistry: oxygen scavenger for aqueous systems and monomer stabilization.
Manufacturing Process
- Synthesis: 3-chloro-1,2-propanediol reacts with sodium hydrosulfide to introduce the thiol group.
- Neutralization: the crude product is neutralized and the salt by-product is separated.
- Distillation: vacuum distillation purifies the liquid to the required assay.
- Filtration: fine filtration removes particulates for a clear final liquid.
- Quality Control: assay, water content, density and color are verified batch by batch with COA issued.
Why Choose Us
- Zorui guarantees 99% min assay with low water content for reliable formulation performance.
- Full documentation package: COA, MSDS, TDS and origin certificate for smooth customs clearance.
- Cosmetic-grade lots available with strict impurity control.
- Nitrogen-blanketed, sealed drums preserve product quality during transport.
- Technical team supports dosage and compatibility questions from your R&D lab.
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FAQ
Q: What is monothioglycerol used for in cosmetics?
A: It acts as a reducing agent that breaks keratin disulfide bonds, which is the working principle of permanent wave and straightening products, and it also protects formulas from oxidation.
Q: Is monothioglycerol the same as thioglycerol?
A: Yes, monothioglycerol, thioglycerol, 3-mercapto-1,2-propanediol and 1-thioglycerol refer to the same compound, CAS 96-27-5.
Q: What grades do you supply?
A: We supply 99% min technical/cosmetic grade in 25kg and 200kg HDPE drums, plus small pack sizes for laboratory evaluation.
Q: Does the product have a strong odor?
A: It has only a faint mercaptan odor in its pure form; proper handling with ventilation is recommended.
Q: What is the shelf life?
A: 24 months when stored sealed under nitrogen in a cool, dark place.
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