114472
Cresol red
indicator grade, Dye content 95 %
Synonym(s):
o-Cresolsulfonphthalein
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About This Item
Empirical Formula (Hill Notation):
C21H18O5S
CAS Number:
Molecular Weight:
382.43
UNSPSC Code:
12171500
NACRES:
NA.47
PubChem Substance ID:
EC Number:
217-064-2
Beilstein/REAXYS Number:
343399
MDL number:
grade
indicator grade
Quality Segment
form
powder or crystals
composition
Dye content, 95%
technique(s)
titration: suitable
color
red-brown
pH
7.2-8.8, yellow to red
useful pH range
1.8-2.0, orange to yellow(acid), 7.0-8.8, yellow to violet(alkaline)
mp
290 °C
density
0.998 g/cm3
λmax
367 nm (2nd), 570 nm
application(s)
diagnostic assay manufacturing
hematology
histology
storage temp.
room temp
SMILES string
Cc1cc(ccc1O)C2(OS(=O)(=O)c3ccccc23)c4ccc(O)c(C)c4
InChI
1S/C21H18O5S/c1-13-11-15(7-9-18(13)22)21(16-8-10-19(23)14(2)12-16)17-5-3-4-6-20(17)27(24,25)26-21/h3-12,22-23H,1-2H3
InChI key
OBRMNDMBJQTZHV-UHFFFAOYSA-N
General description
Cresol Red, also known as o-cresol red, belongs to the phthalein and sulphonphthalein group of dyes. Cresol red changes color from orange to yellow at pH between 0.2-1.8 and yellow to violet at pH between 7.0-8.8. In alkaline solutions, cresol red is present as a hydrophilic dianion. The dianion is small and is violet in color, possessing a larger conjugated system than the yellow hydroxyquinone.
Application
Cresol Red is a widely used pH indicator for routine pH assessments like microbial culture media preparations. In addition, Cresol red is a suitable constituent of PCR reagent systems. Cresol Red is used as a tracking dye in DNA, RNA (agarose), and protein (polyacrylamide) electrophoresis.
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Storage Class
11 - Combustible Solids
wgk
WGK 3
ppe
dust mask type N95 (US), Eyeshields, Gloves
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Related Content
Atsushi Seki et al.
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Novel spectroscopic sensor based on a hetero-core structured fiber optic is described in this paper. The hetero-core structured fiber optic consists of multi mode fibers and a short piece of single mode fiber which was inserted in the multi mode
K Elamrani et al.
Biochimica et biophysica acta, 727(1), 22-30 (1983-01-05)
The kinetics of H+/OH- diffusion across dimyristoyl phosphatidic acid bilayer membranes was measured by following the absorbance of the pH-sensitive indicator Cresol red (o-cresolsulfonphthalein) entrapped in single lamellar vesicles after rapidly changing the external pH in a stopped-flow apparatus. The
K Schilling et al.
Clinical chemistry, 39(2), 251-256 (1993-02-01)
If buffer/indicator systems are used as optical thermometers in multicuvettes, the temperature resolution is limited by errors of optical measurements produced mainly by variations of pathlength and blank transmittance of the wells. Theoretical and practical approaches show that, in multicuvettes
Global Trade Item Number
| SKU | GTIN |
|---|---|
| 114472-25G | 04061838702043 |
| 114472-5G | 04061835570218 |