Pharmacopoeial impurityGuaiacol EP Impurity ACat. No. P-G064-002CAS 120-80-9
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Pharmacopoeial impurity · Guaiacol family
Pharmaceutical analytical standardGuaiacol EP Impurity E
Synonyms: Methyl Benzoate, Benzoic acid methyl ester, Clorius, Methyl benzenecarboxylate, Essence of niobe, FEMA No. 2683, Methylester kyseliny benzoove, NSC 9394, Oxidate le, Methyl benzoate (natural), Methyl ester of benzoic acid, Methyloxycarbonylbenzene
- Cat. No.
- P-G064-004
- CAS
- 93-58-3
- Alternative CAS
- 364358-98-5 (hydrobromide magnesium salt)
- Formula
- C8H8O2
- Molecular weight
- 136.15 g/mol
- Category
- Pharmacopoeial impurity (EP/USP)
Family: Guaiacol
A natural aromatic compound (2-methoxyphenol) formed when wood burns, found in smoke and creosote and first isolated in 1826; it is used as an expectorant and as a raw material for flavourings.
Did you know?It gives whisky its smoky, peaty taste and contributes to the aroma of roasted coffee. About 85% of the world's vanillin is made from it.
The two levels compared
| Level 1 Mass balance | Level 2 Mass balance + qNMR | |
|---|---|---|
| Identity (IR, MS, 1H and 13C-NMR; peptides: ESI-MS, MALDI-TOF and IR) | ✓ | ✓ |
| HPLC purity (min. 95%) | ✓ | ✓ |
| Content by mass balance (min. 90%; peptides: for information only)* | ✓ | ✓ |
| Content verified by qNMR (small molecules only) | · | ✓ |
| Suitable to qualify it as an in-house primary standard (ICH Q7) | · | ✓ |
* Mass balance is performed on every molecule. The only exceptions are cases where the chemistry of the molecule prevents it, for example oils and highly volatile substances, on which some of the required measurements cannot be made: in those cases the CoA states how the content was assigned.
What you receive
The analytical standard
Shipped under controlled temperature when the molecule requires it.
Certificate of analysis (CoA)
For every lot: identity, purity and assay, with the supporting spectra and chromatograms.
Safety data sheet (SDS)
Sent with every order.
Tracked shipment
Follow your shipment live, from our warehouse to your lab.
More products in the Guaiacol family
Pharmacopoeial impurityGuaiacol EP Impurity ACat. No. P-G064-002CAS 120-80-9
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Impurity2-MethoxyphenolCat. No. P-G064-005CAS 90-05-1
Impurity3-MethoxyphenolCat. No. P-G064-006CAS 150-19-6
ImpurityGuaiacol-4-Sulfonate Potassium SaltCat. No. P-G064-007CAS 16241-25-1
ImpurityGuaiacol-5-Sulfonic AcidCat. No. P-G064-008CAS 879-98-1
Impurityp-CresolCat. No. P-G064-009CAS 106-44-5Frequently asked questions
Is mass balance always performed?
Yes, on every molecule. The only exceptions are cases where the chemistry of the molecule prevents it: for example oils and highly volatile substances, on which some measurements (such as thermogravimetry) cannot be made. In those cases the CoA states which method was used to assign the content.
Can I ask for a different quantity?
Yes. The quantities are only suggestions: choose "Other" and enter the milligrams or grams you need.
Which level should I choose?
Level 1 is enough for most routine testing. Level 2 adds an independent qNMR content value and is meant for labs that need to qualify an in-house primary standard. For peptides and similar molecules, Level 2 is not available.
When will I get the quote?
Within 24 working hours, with price, availability and delivery time.
Need a molecule you cannot find?
Custom synthesis of impurities, metabolites and labelled compounds, with the same characterisation level.