Pharmacopoeial impuritySodium Cromoglicate EP Impurity ACat. No. P-C257-002CAS 699-83-2
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Impurity or related compound · Cromoglicic Acid family
Pharmaceutical analytical standardCromoglicic Acid Impurity 9
Synonyms: 5-[3-(2,3-Dihydroxyphenoxy)-2-hydroxypropoxy]-4-oxochromene-2-carboxylic acid
- Cat. No.
- P-C257-019
- CAS
- N/A
- Alternative CAS
- N/A
- Formula
- C19H16O9
- Molecular weight
- 388.33 g/mol
- Category
- Impurity or related compound
Family: Cromoglicic Acid
A mast cell stabiliser: it stops these cells from releasing histamine and other allergy mediators. Discovered in 1965, it is used to prevent asthma and, as a nasal spray or eye drops, for allergic rhinitis and conjunctivitis.
Did you know?It was discovered by Roger Altounyan, an asthmatic pharmacologist, who inhaled derivatives of khellin on himself; khellin comes from khella (Ammi visnaga), a plant used since ancient Egypt as a muscle relaxant.
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.
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ImpurityCromoglicic Acid Impurity 4 Sodium SaltCat. No. P-C257-009CAS 40820-38-0Frequently 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.