3-(Methylthio) propionaldehyde（CAS#3268-49-3）
| Risk Codes | R20/22 - Harmful by inhalation and if swallowed. R34 - Causes burns R36/37/38 - Irritating to eyes, respiratory system and skin. R20 - Harmful by inhalation R52/53 - Harmful to aquatic organisms, may cause long-term adverse effects in the aquatic environment. R43 - May cause sensitization by skin contact R41 - Risk of serious damage to eyes R38 - Irritating to the skin R20/21/22 - Harmful by inhalation, in contact with skin and if swallowed. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S37/39 - Wear suitable gloves and eye/face protection |
| UN IDs | UN 2785 6.1/PG 3 |
| WGK Germany | 1 |
| RTECS | UE2285000 |
| FLUKA BRAND F CODES | 10-13-23 |
| TSCA | Yes |
| HS Code | 29309070 |
| Hazard Class | 6.1(b) |
| Packing Group | III |
3 Methylthio propionaldehyde Methional | CAS 3268 49 3
One Line Sourcing Position
High purity 3 Methylthio propionaldehyde for flavor formulation, fragrance compounding, and organic synthesis applications.
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Specification
| Parameter | Specification |
|---|---|
| Purity by GC | 97.0 percent minimum, typical batch 98.0 to 99.0 percent |
| Appearance | Colorless to pale yellow clear liquid |
| Molecular Formula | C4H8OS |
| Molecular Weight | 104.17 g per mol |
| Boiling Point | 165 to 166 degrees Celsius |
| Density at 20 deg C | 1.035 to 1.055 g per mL |
| Refractive index nD20 | 1.479 to 1.493 |
| Flash Point | 61 to 74 degrees Celsius（closed cup） |
| Acid Value | 10.0 mg KOH per g maximum |
| Water Solubility | Insoluble in water |
| LogP（o/w） | 0.71 |
| Shelf Life | 6 to 12 months under proper storage |
| Stock Status | In Stock in US warehouse and China hub |
Available Quantity and Lead Time
Regular supply: 100 g to 20 metric tons per shipment
Lead time: 3 to 5 days for standard packaging; bulk orders require 7 to 10 days
Document Support
COA SDS HPLC chromatogram NMR spectrum Mass spectrum MS available upon request
Application
3 Methylthio propionaldehyde, also known as methional, is the major product of chemical methionine conversion via Strecker degradation in food. It is a sulfur containing aldehyde with a powerful, highly pervasive cooked potato aroma that is useful across multiple applications.
In the flavor industry, 3 methylthio propionaldehyde is widely used as a food flavoring agent for baked goods, spices, soft drinks, candy, and savory products. It imparts onion, meat, cheese, and potato notes that are especially effective at surprisingly low dose rates. It is commonly used in bread type flavors, pizza base flavors, potato chips, and black tea and green tea products. It is approved as FEMA GRAS (No. 2747) and meets JECFA specifications (No. 466).
In the fragrance industry, 3 methylthio propionaldehyde serves as a building block in the synthesis of various aroma compounds, imparting desirable scents to perfumes, cosmetics, and personal care products. Its applications range from vegetable and savory accords to a wide range of non savory products.
In organic synthesis, this compound is used as a key intermediate for the synthesis of pharmaceutical methionine and other sulfur containing compounds. It has wide applications in organic synthesis as a solvent and reagent, including the synthesis of agricultural chemicals, pharmacological drugs, property enhancing additives, and chemical resistant polymers.
Custom Synthesis Support
We offer custom synthesis for 3 methylthio propionaldehyde derivatives including isotopically labeled analogs, higher purity grades (99.0 percent and above), and custom formulations. Share your technical datasheet for feasibility review.
Packaging and Shipping
Available in 5 g, 25 g, 100 g, 500 g, 1 kg, 5 kg, or 25 kg HDPE drums with PTFE lined caps. Custom packaging such as amber glass bottles under inert atmosphere is supported. Fastest dispatch within 7 days after order confirmation.
3 Methylthio propionaldehyde is classified as UN 2785, Class 6.1 (Poison), Packing Group III. Store long term at 2 to 8 degrees Celsius under inert atmosphere. The compound is air sensitive; handle and store under inert gas（nitrogen or argon）. Keep away from strong oxidizing agents and strong bases.
Why XinChem
XinChem provides 3 methylthio propionaldehyde with strict control of purity, acid value, and odor profile for US customers. Our ISO 9001 certified facility monitors every batch by GC and sensory evaluation, ensuring consistent quality for flavor, fragrance, and synthesis applications. We maintain a buffer stock in US warehouses for emergency deliveries within 48 hours. Each order includes a full documentation package: COA, SDS, and chromatograms accessible through our online portal. Our technical support team assists with handling under inert atmosphere, stability optimization, and regulatory compliance including TSCA, EINECS (221-882-5), FEMA GRAS No. 2747, and JECFA No. 466. For contract customers, we offer quarterly price locks and consignment inventory to reduce supply chain risk. Trusted by numerous flavor houses, fragrance companies, and pharmaceutical research institutions in North America. We also provide free sample evaluation for qualified R&D projects and a price match guarantee against any valid competitor quote for equivalent quality. All shipments are packaged under inert atmosphere to prevent oxidation and preserve olfactory quality, with clear handling instructions.
FAQ
Q1 How should 3 methylthio propionaldehyde be stored to maintain its quality?
A Store long term at 2 to 8 degrees Celsius in tightly sealed containers under inert atmosphere (nitrogen or argon). The compound is air sensitive and should be protected from light and strong oxidizing agents. Shelf life is 6 to 12 months under recommended conditions.
Q2 What purity grades do you supply?
A Standard grade is 97.0 percent minimum by GC. We also supply 98.0 percent and 99.0 percent grades for high end flavor applications and analytical reference standards upon request.
Q3 Is 3 methylthio propionaldehyde soluble in water?
A No, it is insoluble in water. It is soluble in alcohol, propylene glycol, and oils.
Q4 Do you provide sample quantities for flavor development?
A Yes, free samples of 5 g are available for qualified US companies. Shipping fee applies for small quantities.
Q5 Is 3 methylthio propionaldehyde approved for use as a food flavoring?
A Yes, it is FEMA GRAS (No. 2747) and meets JECFA specifications (No. 466). It is listed in FDA regulations for use as a flavoring agent. Please request our regulatory package for your specific application.
Q6 What are the common impurities and how do you control them?
A Key impurities include oxidation products and residual solvents. Our specification limits acid value to 10.0 max and total impurities below 1.0 percent. Full impurity profiling is provided per batch.
Q7 What is the odor profile of this compound?
A It has a powerful, highly pervasive onion and meat like odor. In dilution, the onion character diminishes, revealing a pleasant, fresh bouillon like aroma that is reminiscent of cooked potatoes.
