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Bromocresol Purple

Bromocresol Purple Structure
Bromocresol Purple structure
CAS No.
115-40-2
Chemical Name:
Bromocresol Purple
Synonyms
BCP;bromocresol;BROMCRESOL PURPLE;BROMOCRESOL PURPLE SOLUTION;4,4’-(3h-2,1-benzoxathiol-3-ylidene)bis(2-bromo-6-methylphenol)s,s-dioxide;Nsc 374134;M.W. 540.24;Bromocresolred;BromocresolPurpbe;Bromocresol purpl
CBNumber:
CB1347717
Molecular Formula:
C21H16Br2O5S
Molecular Weight:
540.22
MDL Number:
MFCD00011681
MOL File:
115-40-2.mol
MSDS File:
SDS
TDS File:
TDS
Last updated:2026-08-25 20:17:46
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Bromocresol Purple Properties

Melting point 240 °C (dec.) (lit.)
bulk density 515kg/m3
Density 1.6509 (estimate)
Flash point 36 °C
storage temp. Store at +5°C to +30°C.
solubility ethanol: soluble1mg/mL
pka 6.21, 6.3, 6.4(at 25℃)
form Solid
Boiling point 590.2±50.0 °C(Predicted)
color Purplish-brown
PH Range 5.2(yellow)-6.8(purple)
PH pH : 5.2~6.8
Water Solubility practically insoluble
λmax 419nm, 433nm, 591nm
ε(extinction coefficient) ≥22000 at 418-424nm in methanol
Merck 14,1387
BRN 359618
Henry's Law Constant 9.9×1012 mol/(m3Pa) at 25℃, HSDB (2015)
Stability Stable. Incompatible with strong oxidizing agents.
Major Application Waveguides, fuel cells, sensors, sol-gel technology, display device, falsification-proof security paper, paints, detergents, identifying fresh and stale rice, detecting lactic acid bacteria, dental materials, vaginal infection test method
InChI 1S/C21H16Br2O5S/c1-11-7-13(9-16(22)19(11)24)21(14-8-12(2)20(25)17(23)10-14)15-5-3-4-6-18(15)29(26,27)28-21/h3-10,24-25H,1-2H3
InChIKey ABIUHPWEYMSGSR-UHFFFAOYSA-N
SMILES Cc1cc(cc(Br)c1O)C2(OS(=O)(=O)c3ccccc23)c4cc(C)c(O)c(Br)c4
CAS DataBase Reference 115-40-2(CAS DataBase Reference)
FDA UNII 201C22C3EC
EPA Substance Registry System Bromcresol Purple (115-40-2)
UNSPSC Code 12171502
NACRES NA.47

SAFETY

Risk and Safety Statements

Symbol(GHS)  Exclamation Mark (GHS07)
GHS07
Signal word  Warning
Hazard statements  H315-H319-H335
Precautionary statements  P261-P280a-P304+P340-P305+P351+P338-P405-P501a-P264-P280-P302+P352+P332+P313+P362+P364-P305+P351+P338+P337+P313
PPE dust mask type N95 (US), Eyeshields, Gloves
Hazard Codes  Xi,Xn
Risk Statements  36/37/38-10-20/21/22
Safety Statements  26-36-37/39-16
RIDADR  UN 1993 3/PG 3
WGK Germany  3
TSCA  TSCA listed
HS Code  29349990
Storage Class 11 - Combustible Solids
Hazardous Substances Data 115-40-2(Hazardous Substances Data)
NFPA 704
1
0 0

Bromocresol Purple price More Price(67)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 114375 Bromocresol Purple BioReagent, suitable for indicator, Dye content 90% 115-40-2 5g $77.1 2026-04-30 Buy
Sigma-Aldrich 114375 Bromocresol Purple BioReagent, suitable for indicator, Dye content 90% 115-40-2 25g $229 2026-04-30 Buy
Sigma-Aldrich 1.03025 Bromocresol purple indicator ACS,Reag. Ph Eur 115-40-2 5G $156 2026-04-30 Buy
Sigma-Aldrich 1.03025 Bromocresol purple indicator ACS,Reag. Ph Eur 115-40-2 25g $390 2026-04-30 Buy
TCI Chemical B0580 Bromocresol Purple >97.0%(HPLC) 115-40-2 25g $146 2026-04-30 Buy
Product number Packaging Price Buy
114375 5g $77.1 Buy
114375 25g $229 Buy
1.03025 5G $156 Buy
1.03025 25g $390 Buy
B0580 25g $146 Buy

Bromocresol Purple Chemical Properties,Uses,Production

Chemical Properties

Crystalline

Uses

As indicator, pH 5.2 yellow; pH 6.8 purple.

Uses

It is used as a pH indicator and to measure serum albumin concentrations. It is used as a pH indicator (5.2-6.8 : yellow to blue-purple) and also used in spectrophotometric determination of serum-albumin.

Uses

Bromocresol purple has been used as a pH indicator in the yeast culture media. It has been used as a pH indicator in the culture media of Geobacillus stearothermophilus subsp. Calidolactis.

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 3-bromo-4-hydroxy-5-methylphenyl groups. A hydrophilic dye that is used as a pH indicator and to measure serum albumin concentrations.

General Description

Bromocresol purple is a pH indicator, which changes color from yellow (at low pH 5.2) to violet (above pH 6.8). It aids in determining the dead cell count for cells with plasma membrane damage. Bromocresol purple is widely used as a fluorescent stain in yeast cells. Cells with an intact plasma membrane are not stained, while damaged cells are seen as blue-grey ghosts.

Biochem/physiol Actions

Bromocresol purple is a pH indicator which changes color from yellow (at low pH 5.2) to violet (above pH 6.8). It is mainly used as a fluorescent stain in yeast cells. It helps in dead cell count for cells with plasma membrane damage. Cells with proper cell membrane are not stained, while damaged cells are seen as blue-grey ghosts.

Purification Methods

Dissolve the dye in aqueous 5% NaHCO3 solution and precipitate it from a hot solution by dropwise addition of aqueous HCl. Repeat this until the UV/VIS-extinction did not increase at 419nm. It can also be recrystallised from *benzene. It is an indicator: at pH 5.2 (yellow) and pH 6.8 (purple). [Beilstein 19/3 V 460.]

Bromocresol Purple Preparation Products And Raw materials

Raw materials

ethionic anhydride o-Cresol o-Toluidine

Preparation Products

Bromocresol Purple Suppliers

Global( 535)Suppliers
Supplier Tel Email Country ProdList Advantage
SHENYANG SINOCHEM BIOTECH CO.,LTD 23769576 13840269002 274311108@qq.com China 255 58
Guangdong Shengke Biochemical Technology Co., Ltd. 18925113981 18925113981 3809205144@qq.com China 4069 58
Shenyang yimoke chemical products co. LTD 13998106873 297303255@qq.com China 150 58
Codow Chemical Co.,Ltd. 17612033329 17612033329 sudy@howeipharm.com China 7518 55
Shenyang Shengyuan chemical industry co., ltd 13190211560 1319074246@qq.com China 95 58
J & K SCIENTIFIC LTD. 18210857532 18210857532 jkinfo@jkchemical.com China 96815 76
Meryer (Shanghai) Chemical Technology Co., Ltd. 4006356688 18621169109 market03@meryer.com China 40202 62
INTATRADE GmbH +49 3493/605464 sales@intatrade.de Germany 3563 66
3B Pharmachem (Wuhan) International Co.,Ltd. 18930552037 3bsc@sina.com China 15813 69
future industrial shanghai co., ltd 400-0066400 13621662912 sales@jonln.com China 1989 65
Supplier Advantage
SHENYANG SINOCHEM BIOTECH CO.,LTD 58
Guangdong Shengke Biochemical Technology Co., Ltd. 58
Shenyang yimoke chemical products co. LTD 58
Codow Chemical Co.,Ltd. 55
Shenyang Shengyuan chemical industry co., ltd 58
J & K SCIENTIFIC LTD. 76
Meryer (Shanghai) Chemical Technology Co., Ltd. 62
INTATRADE GmbH 66
3B Pharmachem (Wuhan) International Co.,Ltd. 69
future industrial shanghai co., ltd 65

Related Questions

Ask a question
Q:What is the concentration of bromocresol purple indicating solution?Janice - Jun 30,2026
A:When preparing bromocresol purple solution, add 0.1 g in 100 mL Ethanol (20%) or 0.04 g in 0.74 mL Sodium Hydroxide solution, dilute 0.1 mol/L and fill up to 100 mL with water. It acts as pH indicator, transitions from yellow to purple across a pH range of 5.2 to 6.8.

View Lastest Price from Bromocresol Purple manufacturers

Image Update time Product Price Min. Order Purity Supply Ability Manufacturer
Bromocresol Purple pictures 2026-09-11 Bromocresol Purple
115-40-2
 1KG 99% 1000kg WUHAN FORTUNA CHEMICAL CO., LTD
Bromocresol Purple pictures 2026-08-21 Bromocresol Purple
115-40-2
 $1.00-100.00 1kg 99% 800tons Hebei Dangtong Import and export Co LTD
Bromocresol Purple pictures 2026-06-30 Bromocresol Purple
115-40-2
 1kg 99% 10000KGS Shaanxi Dideu New Materials Co. Ltd

Bromocresol Purple Spectrum

Bromocresol Purple(115-40-2)MSBromocresol Purple(115-40-2)1HNMRBromocresol Purple(115-40-2)13CNMRBromocresol Purple(115-40-2)IR1Bromocresol Purple(115-40-2)IR2

115-40-2(Bromocresol Purple)Related Search:

Cresol Purple 2,3-Dibromosuccinic acid Bromocresol green CRESYL VIOLET ACETATE Chlorosulfonyl isocyanate
m-Cresol o-Cresol 1,3-Dibromo-5,5-dimethylhydantoin Phenylmethylsulfonyl fluoride 2,2-Bis(bromomethyl)propane-1,3-diol
Sulfosulfuron 2,3-Dibromopropionic acid 1,2-Dibromopropane Bromocresol purple indicator solution NA
Phthalimide Bromocresol blue sodium salt Cresol Bromocresol Purple Solution

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4,4’-(3h-2,1-benzoxathiol-3-ylidene)bis(2-bromo-6-methylphenol)s,s-dioxide 4,4’-(3h-2,1-benzoxathiol-3-ylidene)bis(2-bromo-6-o-cresol)s,s-dioxide 4,4’-(3H-2,1-Benzoxathiol-3-ylidene)bis[2-bromo-b-methylphend]S,S-dioxide Bromocresol purple indicator solution (for microbial limit check) 3',3''-DIBROMO-O-CRESOLSULFONPHTHALEIN Bromocresol Purple, indicator grade, pure Phenol, 4,4-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis2-bromo-6-methyl- Bromocresol Purple (0.04% in Water) [for pH Determination] Bromocresol Purple (0.05% in ca. 20% Ethanol) [for Titration] 5,5μ-Dibromo-o-cresolsulfonphthalein, Bromcresol purple sultone form A,A-BIS(5-BROMO-4-HYDROXY-M-TOLYL)-A-HYDROXY-O-TOLUENESULFONIC ACID G-SULTONE 5',5''-DIBROMO-2-CRESOLSULFONEPHTHALEIN 5',5''-DIBROMO-O-CRESOLSULFONEPHTHALEIN 5',5'-DIBROMO-O-CRESOLSULFONEPHTHALEIN 5',5''-DIBROMO-O-CRESOLSULFONPHTHALEIN 5,5'-DIBROMO-O-CRESOLSULFONPHTHALEIN BROMOCRESOL PURPLE INDICATOR GRADE BROMOCRESOL PURPLE, FOR MICROSCOPY BROMOCRESOL PURPLE SOLUTION, ACID-BASEIN DICATOR BROMOCRESOL PURPLE INDICATOR, REAG. PH. EUR. BROMO CRESOL PURPLE SOLUTION 100 ML BromocresolPurpleIndicatorSolution BromoethaneForSynthesis BromocresolPurple,FreeAcid M.W. 540.24 BROMOCRESOL PURPLE SOLUTION BROMOCRESOL PURPLE, REAG. BromocresolPurpbe BROMCRESOL PURPLE SULTONE FORM BROMCRESOL PURPLE BROMOCRESOL PURPLE BROMOCRESOL PURPLE ETHANOL(20) BROMOCRESOL PURPLE TS DIBROMO-O-CRESOLSULFONPHTHALEIN Bromocresolred dibromo-o-cresolphthaleinsulfone pourpredebromocresol 3H-2,1-Benzoxathiole, phenol deriv. Bromocresol Purple Solution [for spray] 3,3-Bis(3-bromo-4-hydroxy-5-methylphenyl)-3H-2,1-benzoxathiol 1,1-dioxide 3,3-Bis(3-bromo-4-hydroxy-5-methylphenyl)-3H-2,1-benzoxathiole 1,1-dioxide 3,3-Bis(4-hydroxy-3-bromo-5-methylphenyl)-3H-2,1-benzoxathiole 1,1-dioxide Bromocresol Purple,pure,indicator grade Bromocresol Purple,Free Acide BroMocresol Purple, indicator grade, pure 140GR BroMocresol Purple, indicator grade, pure 25GR BroMocresol Purple, indicator grade, pure 5GR BroMocresol Purple (BCP) BROMOCRESOL PURPLE INDICATOR 5 G BROMOCRESOL PURPLE INDICATOR 25 G 3,3-Bis(3-broMo-4-hydroxy-5-Methylphenyl)-3H-benzo[c][1,2]oxathiole 1,1-dioxide BroMocresol Purple, Sultone, Reagent, ACS BroMocresol Purple, ACS reagent, indicator BroMocresol purole 3,3-Bis(3-bromo-4-hydroxy-5-methylphenyl) Nsc 374134 O-toluenesulfonic acid, Α,α-bis(5-bromo-4-hydroxy-m-tolyl)-α-hydroxy-, Γ-sultone Bromocresol purple *CAS 115-40-2* *Ultrapure grade*