o-Cresolphthalein complexone, indicator grade
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o-Cresolphthalein complexone, indicator grade
o-Cresolphthalein complexone, indicator grade
o-Cresolphthalein complexone, indicator grade
Thermo Scientific Chemicals

o-Cresolphthalein complexone, indicator grade

CAS: 2411-89-4 | C32H32N2O12 | 636.61 g/mol
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Catalog number L03859.14
also known as L03859-14
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191.65
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Quantity:
25 g
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Price (USD)
191.65
Special offer
Online exclusive
Ends: 31-Dec-2025
225.00
Save 33.35 (15%)
Each
Add to cart
Chemical Identifiers
CAS2411-89-4
IUPAC Name2-[({5-[1-(3-{[bis(carboxymethyl)amino]methyl}-4-hydroxy-5-methylphenyl)-3-oxo-1,3-dihydro-2-benzofuran-1-yl]-2-hydroxy-3-methylphenyl}methyl)(carboxymethyl)amino]acetic acid
Molecular FormulaC32H32N2O12
InChI KeyIYZPEGVSBUNMBE-UHFFFAOYSA-N
SMILESCC1=CC(=CC(CN(CC(O)=O)CC(O)=O)=C1O)C1(OC(=O)C2=CC=CC=C12)C1=CC(C)=C(O)C(CN(CC(O)=O)CC(O)=O)=C1
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SpecificationsSpecification SheetSpecification Sheet
Appearance (Color)White to cream
FormPowder
Loss on Drying<6.0% (105?C/constant weight)
lambda-max (UV-Vis)561-581 nm (0.1M NaOH)
Indicator for complexometric titration of Mg, Ca, Sr and Ba. It is used as an alkaline earth metal ion indicator. Suggested to be colorless at pH 11, but turns pink in the presence of alkaline earth metals. Also utilized in an auto analyzer to determine serum calcium.

This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Scientific Chemicals.

Applications
Indicator for complexometric titration of Mg, Ca, Sr and Ba. It is used as an alkaline earth metal ion indicator. Suggested to be colorless at pH 11, but turns pink in the presence of alkaline earth metals. Also utilized in an auto analyzer to determine serum calcium.

Solubility
Soluble in NaOH (50 mg/ml), aqueous ammonia, and organic solvents. Insoluble in water.

Notes
Store away from strong oxidizing agents. Keep container tightly closed. Store in cool, dry conditions in well sealed containers.
RUO – Research Use Only

General References:

  1. J. Stern; W.H.P. Lewis. The colorimetric estimation of calcium in serum with o-cresolphthalein complexone. Clinica Chimica Acta. 1957, 2, (6), 576-580.
  2. F. H. Pollard and J. V. Martin. The spectrophotometric determination of the alkaline-earth metals with murexide, eriochrome black T and with o-cresolphthalein complexone. Analyst. 1956, 81, (963), 348-353.
  3. Indicator for complexometric titration of Mg, Ca, Sr and Ba: Helv. Chim. Acta, 72, 113 (1954).