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
Beilstein/REAXYS Number:
343399
EC Number:
MDL number:
UNSPSC Code:
12171500
PubChem Substance ID:
NACRES:
NA.47
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Recommended Products
grade
indicator grade
Quality Level
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
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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.
Storage Class
11 - Combustible Solids
wgk_germany
WGK 3
ppe
dust mask type N95 (US), Eyeshields, Gloves
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