Cresol Red
- CAS NO.:1733-12-6
- Empirical Formula: C21H18O5S
- Molecular Weight: 382.43
- MDL number: MFCD00005878
- EINECS: 217-064-2
- SAFETY DATA SHEET (SDS)
- Update Date: 2024-04-16 18:29:06
What is Cresol Red?
Chemical properties
Dark green or brown-red powder
The Uses of Cresol Red
Cresol red is commonly used with lead acetate for the detection of urease after PAGE. It is also used as an indicator with the following transition intervals: pH 1.8 (orange) to pH 2.0 (yellow); pH 7.0 (yellow) to pH 8.8 (violet). Cresol Red is used as a tracking dye in DNA, RNA (agarose) and protein (polyacrylamide) electrophoresis. In agarose, Cresol Red runs with an apparent molecular size of approx. 125 bp DNA. Cresol Red does not inhibit Taq polymerase.
The Uses of Cresol Red
Acid-base indicator.
What are the applications of Application
Cresol red is a stain commonly used with lead acetate for detection of urease after PAGE
definition
ChEBI: A member of the class of 2,1-benzoxathioles that is 2,1-benzoxathiole 1,1-dioxide in which both of the hydrogens at position 3 have been substituted by 4-hydroxy-5-methylphenyl groups.
Purification Methods
Crystallise it from glacial acetic acid. Dry it in air. Dissolve it in aqueous 5% NaHCO3 solution and precipitate it from a hot solution by dropwise addition of aqueous HCl. Repeat the procedure till the UVmax does not increase. [Beilstein 19 IV 1133.]
Properties of Cresol Red
Melting point: | 290 °C |
Boiling point: | 479.59°C (rough estimate) |
Density | 0.998 g/cm3 |
refractive index | 1.5300 (estimate) |
storage temp. | Store at +5°C to +30°C. |
solubility | Solubility Sparingly soluble in water; soluble in ethanol |
form | Powder |
pka | 1.0(at 25℃) |
color | Dark green or brown-red |
PH Range | 7.2(YELLOW)--8.8(PURPLISH RED) |
PH | 7.2~8.8 |
Water Solubility | soluble |
λmax | 570nm, 367nm, 432nm |
Merck | 14,2578 |
BRN | 343399 |
Major Application | Display device, optical sensors, combustion gas detection system, inks, correction fluid, diapers, toothpaste, identifying fresh and stale rice, food storage, determine glucose in dialysis solution, monitor metabolic activity of microorganisms, detect bacterialinfection, psychoactive drugs, dental impression material |
EPA Substance Registry System | Cresol Red (1733-12-6) |
Safety information for Cresol Red
Signal word | Warning |
Pictogram(s) |
Exclamation Mark Irritant GHS07 |
GHS Hazard Statements |
H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation |
Precautionary Statement Codes |
P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P304+P340:IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P405:Store locked up. |
Computed Descriptors for Cresol Red
InChIKey | ASMGMVUGPNODGX-UHFFFAOYSA-N |
Abamectin manufacturer
Arnish Laborates Pvt Ltd
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