Cresol Purple

Synonym(s):m-Cresolsulfonphthalein;m-Cresol purple;m-Cresolsulfonphthalein, 2′,2′′-Dimethylphenolsulfonphthalein, MCP

CAS NO.：2303-01-7
Empirical Formula: C21H18O5S
Molecular Weight: 382.43
MDL number: MFCD00005871
EINECS: 218-960-6
SAFETY DATA SHEET (SDS)
Update Date: 2024-08-06 16:32:36

What is Cresol Purple?

Chemical properties

green crystalline powder

The Uses of Cresol Purple

m-Cresol Purple acts as a pH indicator dye. It plays an important role in spectrophotometric pH measurements. It operates in the pH ranges 1.2 - 2.8 (red to yellow) and 7.4 - 9.0 (yellow to violet). Further, it is employed to stain epithelial cells and proteins.

The Uses of Cresol Purple

Acid-base indicator.

What are the applications of Application

m-Cresol Purple is a pH indicator dye

Biochem/physiol Actions

m-Cresol purple is a pH indicator. It changes from red (pH 1.2) to yellow (2.8) and yellow (7.4) to purple (9.0).

Properties of Cresol Purple

Melting point:	>250°C
Boiling point:	577.5±50.0 °C(Predicted)
Density	1.404±0.06 g/cm3(Predicted)
storage temp.	room temp
solubility	Solubility Very slightly soluble in water, ethanol; soluble in methanol
form	Liquid
pka	1.51, 8.32(at 25℃)
color	Dark green
PH Range	1.2 (red) - 2.8 (yellow) and 7.4 (yellow) - 9.0 (purple)
Water Solubility	Soluble in water and sodium hydroxide solution. Slightly soluble in alcohol.
λmax	579nm, 371nm
Merck	14,2577
BRN	350314
Stability:	Stable. Incompatible with strong oxidizing agents.
Major Application	Fuel cells, sensors, display device, falsification-proof security paper, inks, correction fluid, paints, detection of electrophilic gases, lubricants, cement products, packaging system, adhesive, cosmetics, food storage, determining glucose in dialysis solution, screening of cat diseases, detecting carbohydrates, oral hygiene products
EPA Substance Registry System	Phenol, 4,4'-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis[3-methyl- (2303-01-7)

Safety information for Cresol Purple

Signal word	Warning
Pictogram(s)	Exclamation Mark Irritant GHS07
GHS Hazard Statements	H302:Acute toxicity,oral 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. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.