Buying 3-Methylindole (Skatole): What Matters
3-Methylindole (CAS 83-34-1) is a specialty fine chemical bought in small volumes for fragrance, flavour, pharmaceutical and research applications. Because it is used in tiny amounts and its commercial value depends heavily on purity and odour, buyers need to specify more than a headline assay. This guide covers what to check.
For the chemistry behind these points, see our main article on 3-methylindole (CAS 83-34-1).
Step 1: Confirm the Identity
| Item | What to confirm |
|---|---|
| Substance | 3-Methylindole (skatole) |
| CAS number | 83-34-1 |
| Formula / MW | C9H9N / 131.17 g/mol |
Confirm the CAS on the order and on the certificate of analysis; skatole is sometimes confused with other methylindoles.
Step 2: Read the Specification
| Parameter | Why it matters | Typical value |
|---|---|---|
| Assay / purity | The useful content and a key quality indicator | Often 98% or higher, grade-dependent |
| Appearance | Confirms a clean solid | White to off-white crystalline solid |
| Melting point | Identity and purity check | Approx. 93-95 deg C |
| Colour | Discolouration indicates oxidation | Low colour, white to off-white |
| Odour | Critical for fragrance/flavour use | Characteristic; consistent from batch to batch |
For fragrance and flavour customers, the melting point, colour and odour together are the practical quality indicators; a depressed melting point or off-colour product signals impurity or oxidation.
Step 3: Match the Grade and Packaging
- Grade. Technical/fine-chemical grade or a higher-purity grade for fragrance/flavour or reference use, as required.
- Form. Supplied as a crystalline solid; some customers receive dilute solutions for handling.
- Packaging. Sealed containers, often smaller drums or bottles, given the low volumes and the odour-control requirement.
Step 4: Secure the Documentation
- SDS covering handling and odour-control considerations.
- Per-batch COA reporting assay, melting point, appearance and colour.
- Regulatory statements where the material is used in flavour, fragrance or pharmaceutical applications.
Supplier Checklist
- Identity. CAS 83-34-1 confirmed.
- Purity and melting point. Within specification.
- Colour and odour. Consistent, indicating good quality and storage.
- Form and packaging. Suited to your handling.
- Documentation. SDS, per-batch COA and any regulatory statements.
- Consistency. Batch history if odour or purity is critical.
Common Buying Mistakes
- Buying on assay alone. For fragrance/flavour use, colour and odour matter as much as purity.
- Ignoring storage. 3-Methylindole discolours on exposure to light and air, so poor storage degrades it.
- Under-estimating odour. The material is extremely pungent; plan for containment in storage and handling.
- Skipping documentation. Regulated uses (fragrance, flavour) need the right grade and statements.
How PolyBlueChem Can Help
PolyBlueChem can supply 3-methylindole (CAS 83-34-1) as a specialty fine chemical, with the documentation appropriate to your application. To request current specifications, a COA or a quotation, contact the PolyBlueChem team.
Frequently Asked Questions
What should I look for when buying 3-methylindole?
Confirm the CAS (83-34-1), check the assay, melting point, colour and odour, choose the right grade and packaging, and secure the SDS and COA.
Does purity affect the odour?
Yes. Impurities and oxidation products can shift the note, so consistency in purity, colour and odour is important for fragrance and flavour use.
How is 3-methylindole packaged?
Typically in sealed containers suited to small volumes; the strong odour and light sensitivity call for closed, light-resistant packaging.
What documents should come with a shipment?
At minimum an SDS and a per-batch COA, plus any regulatory statements required for your application.
How should it be stored?
Sealed, cool and protected from light and air, to prevent discolouration.