Active ingredientFluoresceinCat. No. P-F088-001CAS 2321-07-5
Drag to rotate
Impurity or related compound · Fluorescein family
Pharmaceutical analytical standardPhthalic Acid
Synonyms: o-phthalic acid, o-dicarboxybenzene, o-benzenedicarboxylic acid, Kyselina ftalova, Ortho-phthalic acid, NSC 5348, Pathalic acid, Leadphthalate,dibasic, Sunftal 20, Alizarinate, Naphthalinate, Phthalinate, Alizarinic acid, Phthalinic acid, Naphthalinic acid, o-Carboxybenzoate, Folpet TP2, o-Carboxybenzoic acid, o-Benzenedicarboxylate, Benzoic acid, 2-carboxy-, Picoxystrobin metabolite 15, Benzene-1,2-dicarboxylic Acid (Phthalic Acid)
- Cat. No.
- P-F088-019
- CAS
- 88-99-3
- Alternative CAS
- 34481-48-6 (other salt)
- 877-24-7 (potassium salt)
- 254110-94-6 (alternative CAS, same compound)
- Formula
- C8H6O4
- Molecular weight
- 166.13 g/mol
- Category
- Impurity or related compound
Family: Fluorescein
A fluorescent dye synthesised in 1871 by the German chemist Adolf von Baeyer: in ophthalmology it highlights damage to the cornea and, injected into a vein, lets doctors photograph the retinal vessels (angiography, first described in 1961).
Did you know?Chicago plumbers used it to trace illegal discharges into the river: that is why, in the 1960s, it was the first dye the city used to turn its river green for St Patrick's Day.
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.
Pharmacopoeial standards available
The official European Pharmacopoeia standards for this molecule, supplied with EDQM documentation.
- Phthalic acid CRSEP Y0000766
More products in the Fluorescein family
Active ingredientFluoresceinCat. No. P-F088-001CAS 2321-07-5
Active ingredientFluorescein DiacetateCat. No. P-F088-002CAS 596-09-8
Pharmacopoeial impurityFluorescein Sodium EP Impurity CCat. No. P-F088-003CAS 2513-33-9
Impurity2',4',5'-TriiodofluoresceinCat. No. P-F088-004CAS 56254-06-9
Impurity2',4',7'-TriiodofluoresceinCat. No. P-F088-005CAS 83498-90-2
ImpurityFluorescein Impurity 1Cat. No. P-F088-006CAS 2321-08-6
Impurity2-monoiodofluoresceinCat. No. P-F088-007CAS 52010-85-2
ImpurityFluorescein Impurity 2Cat. No. P-F088-008CAS 2318-08-3Frequently 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.