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Merck
CN

T0763

Sigma-Aldrich

Thymol Blue sodium salt

≥98%

Synonym(s):

Thymolsulfonphthalein sodium salt

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About This Item

Empirical Formula (Hill Notation):
C27H29NaO5S
CAS Number:
62625-21-2
Molecular Weight:
488.57
Beilstein:
3861515
EC Number:
263-650-6
MDL number:
MFCD00151093
UNSPSC Code:
12352200
PubChem Substance ID:
24899910

Key Documents

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Assay

≥98%

mp

283-285 °C (dec.) (lit.)

solubility

95% ethanol: 10 mg/mL, clear, dark green

SMILES string

[Na+].CC(C)c1cc(c(C)cc1O)C2(OS(=O)(=O)c3ccccc23)c4cc(C(C)C)c([O-])cc4C

InChI

1S/C27H30O5S.Na/c1-15(2)19-13-22(17(5)11-24(19)28)27(21-9-7-8-10-26(21)33(30,31)32-27)23-14-20(16(3)4)25(29)12-18(23)6;/h7-16,28-29H,1-6H3;/q;+1/p-1

InChI key

BAVBEHWEOJMHDS-UHFFFAOYSA-M

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General description

Thymol Blue is a pH indicator with visual transition intervals of pH 1.2 (red) to pH 2.8 (yellow), and pH 8.0 (yellow) to pH 9.2 (blue).

Application

Thymol Blue sodium salt was used to indicate the changes in pH to reflect ionization in multi-component drug formulations.

Storage Class Code

13 - Non Combustible Solids

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Regulatory Information

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Certificates of Analysis (COA)

Lot/Batch Number
068K3724
028K3722
053K3681
042H3660
021K3715

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Ramprakash Govindarajan et al.
Pharmaceutical research, 23(10), 2454-2468 (2006-08-26)
Evaluation of the effect of formulation composition and processing variables on the microenvironment in solid dosage forms, based on ionization of indicator probes. Sulfonephthalein indicators were intimately mixed with individual excipients, binary excipient mixtures or multi-component blends by the solvent
S Passamonti et al.
Biochimica et biophysica acta, 943(2), 119-125 (1988-08-18)
Sulfobromophthalein electrogenic uptake into rat liver plasma membrane vesicles was shown to admit only the quinoid, trivalent anion. The minimum requirement for this electrogenic process has been investigated in rat liver plasma membrane vesicles by using Thymol blue, a pH-indicator
Douglas R Macfarlane et al.
Chemical communications (Cambridge, England), 46(41), 7703-7705 (2010-09-28)
We describe hydrated ionic liquids which have an intrinsic proton buffering action and hence an ability to control proton activity in an ionic medium.
Elodie Verhaeghe et al.
Analytical biochemistry, 379(1), 60-65 (2008-05-22)
The standard assay for iodoperoxidase activity is based on the spectrophotometric detection of triiodide formed during the enzymatic reaction. However, chemical instability of I3- has limited the method to high iodide concentrations and acidic conditions. Here we describe a simple
Olaf A Cirpka et al.
Ground water, 44(2), 212-221 (2006-03-25)
With most existing methods, transverse dispersion coefficients are difficult to determine. We present a new, simple, and robust approach based on steady-state transport of a reacting agent, introduced over a certain height into the porous medium of interest. The agent
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