Active ingredientEthinylestradiolCat. No. P-E117-001CAS 57-63-6
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Pharmacopoeial impurity · Ethinylestradiol family
Pharmaceutical analytical standardEthinylestradiol EP Impurity M
Synonyms: 2-Methyl-Ethinylestradiol, Ethinyl Estradiol Impurity M
- Cat. No.
- P-E117-013
- CAS
- 3240-39-9
- Alternative CAS
- N/A
- Formula
- C21H26O2
- Molecular weight
- 310.44 g/mol
- Category
- Pharmacopoeial impurity (EP/USP)
Family: Ethinylestradiol
A synthetic oestrogen obtained in 1938 by Hans Herloff Inhoffen and Walter Hohlweg, in medical use since 1943. Since the 1960s it has been the oestrogen found in almost all combined contraceptive pills.
Did you know?Compared with natural oestradiol it resists breakdown by the liver much better, thanks to an ethinyl group with a carbon-carbon triple bond: this is why it works when taken by mouth.
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 Ethinylestradiol family
Active ingredientEthinylestradiolCat. No. P-E117-001CAS 57-63-6
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Pharmacopoeial impurityEthinylestradiol EP Impurity GCat. No. P-E117-008CAS 38002-18-5Frequently 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.