188190

Sigma-Aldrich

o-Cresolphthalein Complexone

Synonym(s):
o-Cresolphthalexon, Xylenylphthalein-bisiminodiacetic acid, Metal phthalein, Phthalein purple, o-Cresolphthalein-3′,3′′-bis-methyleneiminodiacetic acid
Empirical Formula (Hill Notation):
C32H32N2O12
CAS Number:
Molecular Weight:
636.60
Beilstein/REAXYS Number:
381994
EC Number:
MDL number:
PubChem Substance ID:

application(s)

titration: suitable

mp

181-185 °C (dec.) (lit.)

λmax

377 nm (2nd)
575 nm

SMILES string

Cc1cc(cc(CN(CC(O)=O)CC(O)=O)c1O)C2(OC(=O)c3ccccc23)c4cc(C)c(O)c(CN(CC(O)=O)CC(O)=O)c4

InChI

1S/C32H32N2O12/c1-17-7-21(9-19(29(17)43)11-33(13-25(35)36)14-26(37)38)32(24-6-4-3-5-23(24)31(45)46-32)22-8-18(2)30(44)20(10-22)12-34(15-27(39)40)16-28(41)42/h3-10,43-44H,11-16H2,1-2H3,(H,35,36)(H,37,38)(H,39,40)(H,41,42)

InChI key

IYZPEGVSBUNMBE-UHFFFAOYSA-N

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storage_class_code

13 - Non Combustible Solids

WGK Germany

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US),Eyeshields,Gloves

Certificate of Analysis

Certificate of Origin

J Toffaletti et al.
Clinical chemistry, 26(11), 1562-1565 (1980-10-01)
We adapted a method for dialyzable calcium from fluorometric detection by use of calcein to a more specific spectrophotometric determination with cresolphthalein complexone. The reagents are available commercially and perform satisfactorily with respect to noise level, drift, stability, and sensitivity....
Improved determination of serum calcium with 2-cresolphthalein complexone.
K Lorentz
Clinica chimica acta; international journal of clinical chemistry, 126(3), 327-334 (1982-12-23)
Improved linearity of the calcium-cresolphthalein complexone reaction with sodium acetate.
D M Cowley et al.
Clinical chemistry, 32(5), 894-895 (1986-05-01)
C M Corns et al.
Annals of clinical biochemistry, 24 ( Pt 4), 345-351 (1987-07-01)
The reasons for the non-linearity of the standard curve for the calcium-cresolphthalein complexone reaction have been investigated. Calcium forms both 1:1 and 2:1 complexes with cresolphthalein complexone; at low calcium concentrations the 1:1 complex predominates and causes non-linearity. At high...
Sandra F Williams et al.
Mayo Clinic proceedings, 80(12), 1655-1657 (2005-12-14)
Severe hypocalcemia may require prompt intervention to avoid life-threatening consequences. We report a case in which a 78-year-old man had a critically low serum calcium level measured with use of standard colorimetric assay after gadodiamide administration during magnetic resonance angiography....

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