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Phenol Red

Chemical Name:
Phenol Red
PR;PHENOLSULFONPHTHALEIN;phenolsulphonphthalein;PRGR;NR3C3;Phenolrde;Phenol re;PHENOL RED;fenolipuna;sulphental
Molecular Formula:
Molecular Weight:
MOL File:

Phenol Red Properties

Melting point >300 °C
Boiling point >300°C
Density 1.445 Mg m-3
refractive index 1.5300 (estimate)
Flash point >300°C
storage temp. no restrictions.
solubility 1 M NaOH: soluble1mg/mL
form Solid
pka 7.9(at 25℃)
color Red
PH 6.8~8.4
Odor Odorless
PH Range 6.6(YELLOW)-8.0(RED)
Water Solubility 0.77 g/L
λmax 557nm, 558nm, 360nm, 423nm, 433nm
Merck 14,7247
BRN 326470
Major Application Display device, sol-gel matrix, photoreceptors, fuel cells, waveguides, paints, detergents, cosmetics, antiperspirant composition, diapers, screening bacteria, detecting viable cells, diagnosis of urogenital ureaplasmosis, treatment of pathogen infections, amyloid-associated diseases, glaucoma, pulmonary hypertension, asthma, chronic obstructive pulmonary disease, erectile dysfunction, Raynaud’s syndrome, heparin overdose, vulvodynia, wound healing, psychoactive drugs, evaluating dental caries activity
CAS DataBase Reference 143-74-8(CAS DataBase Reference)
EWG's Food Scores 1
NCI Dictionary of Cancer Terms PR
EPA Substance Registry System Phenol Red (143-74-8)


Risk and Safety Statements

Signal word  Warning
Hazard statements  H315-H319-H335
Precautionary statements  P261-P280a-P304+P340-P305+P351+P338-P405-P501a
Hazard Codes  Xi,C
Risk Statements  36/37/38-34
Safety Statements  37/39-26-45-36/37/39-27
WGK Germany  3
RTECS  SJ7490000
HS Code  29349990
Toxicity LD50 orl-rat: >600 mg/kg CTOXAO 4(2),185,71
NFPA 704
1 0

Phenol Red price More Price(41)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich PX0530 Phenol Red Meets ACS Specifications GR ACS 143-74-8 25G $189 2022-05-15 Buy
Sigma-Aldrich 114529 Phenol Red ACS reagent 143-74-8 5g $24.7 2022-05-15 Buy
Sigma-Aldrich 114529 Phenol Red ACS reagent 143-74-8 25g $71.7 2022-05-15 Buy
Sigma-Aldrich 1.59375 Phenol red (phenolsulfonphthalein) Reag. Ph Eur 143-74-8 1 g $717 2022-05-15 Buy
Sigma-Aldrich 1.59375 Phenol red (phenolsulfonphthalein) Reag. Ph Eur 143-74-8 100 g $7470 2022-05-15 Buy
Product number Packaging Price Buy
PX0530 25G $189 Buy
114529 5g $24.7 Buy
114529 25g $71.7 Buy
1.59375 1 g $717 Buy
1.59375 100 g $7470 Buy

Phenol Red Chemical Properties,Uses,Production

Chemical Properties

dark red powder


As indicator in 0.02-0.05% alcohol solution. pH 6.8 yellow, 8.4 red.


Phenol red is used as a non absorbed marker in gravimetric method. It is a pH indicator used in cell biology laboratories and in home swimming pool test kits. It is used to check the kidney function based on the excreted phenol red by colorimetric method.


ChEBI: 3H-2,1-Benzoxathiole 1,1-dioxide in which both of the hydrogens at position 3 have been substituted by 4-hydroxyphenyl groups. A pH indicator changing colour from yellow below pH 6.8 to bright pink above pH 8.2, it is commonly used as an indicator in cell cultures and in home swimming pool test kits. It is also used in the (now infrequently performed) phenolsulfonphthalein (PSP) test for estimation of overall blood flow through the kidney.

Biochem/physiol Actions

Phenol Red is a pH indicator which changes color from yellow to red.

Safety Profile

Moderately toxic by ingestion and intravenous routes. Mutation data reported. When heated to decomposition it emits toxicvapors of SOx.

Enzyme inhibitor

This pH-indicating dye (FW = 354.38 g/mol; CAS 143-74-8; pKa = 7.9; yellow < pH 6.8; red > pH 8.4), also known as phenolsulfonphthalein and sulfophthalein, is a diagnostic aid for evaluating renal function. A typical stock indicator solution is 0.1 g phenol red in 28.2 mL 10 mM NaOH and 221.8 mL water. Target(s): aldehyde reductase; glutaminase; gglutamyl transpeptidase; glutathione S-transferase; 4- methyleneglutaminase; phosphate uptake; thromboxane A2/prostaglandin H2 receptor; and thyroglobulin iodination.

Synthesis of Phenol Red from Saccharin and Phenol

Phenol Red Preparation Products And Raw materials

Global( 349)Suppliers
Supplier Tel Email Country ProdList Advantage
Henan Tianfu Chemical Co.,Ltd.
0371-55170693 China 22021 55
Hangzhou FandaChem Co.,Ltd.
+8615858145714 China 9382 55
career henan chemical co
+86-0371-86658258 China 29959 58
+86 18953170293 CHINA 2940 58
Chongqing Chemdad Co., Ltd
+8613650506873 CHINA 37442 58
0371-55170695 CHINA 26742 58
Shenyang Xianchuang Chemical Co., Ltd.
+86-024-23769576 +8615040101888 China 152 58
+8618523575427 China 47501 58
Tangshan Moneide Trading Co., Ltd.
315-8309571 +8615633399667 CHINA 547 58
Zhuozhou Wenxi import and Export Co., Ltd
+8613111626072 CHINA 13187 58

View Lastest Price from Phenol Red manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2021-11-23 Phenol red
US $100.00 / KG 5KG 99% 500kgs per month Shenyang Xianchuang Chemical Co., Ltd.
2021-10-11 Phenol Red
US $10.00 / KG 1KG 99% 20 tons Hebei Zhanyao Biotechnology Co. Ltd
2021-08-13 Phenol Red USP/EP/BP
US $1.10 / g 1g 0.999 100 Tons min Dideu Industries Group Limited
  • Phenol red
  • US $100.00 / KG
  • 99%
  • Shenyang Xianchuang Chemical Co., Ltd.
  • Phenol Red
  • US $10.00 / KG
  • 99%
  • Hebei Zhanyao Biotechnology Co. Ltd
PHENOL REDRESEARCH GRADE A-HYDROXY-A A-BIS(P-HYDROXYPHENYL)-O-TOLUENESULFONIC ACID G-SULTONE 3,3-BIS(P-HYDROXYPHENYL)-2,1-3H-BENZOXATHIOLE SULFONAPHTHAL TIMTEC-BB SBB006473 PHENOSULFOHEPHTHALEIN INDICATOR PHENOLSULFONEPHTHALEIN PHENOLSULFONPHTHALEIN TEST SOLUTION PHENOLSULPHONEPHTHALEIN PHENYLSULFONEPHTHALEIN PHENYLSULFONPHTHALEIN PHENOL RED LABOTEST-BB LT00455865 PHENOL RED FREE ACID CELL CULTURE TESTED 4-[3-(4-Hydroxyphenyl)-1,1-dioxobenzo[c]oxathiol-3-yl]phenol 3,3-Bis(4-hydroxyphenyl)-3H-2,1-benzoxathiol 1,1-dioxide Phenol Red,pure,indicator Phenol Red,pure,conform to ACS 4,4’-(3h-2,1-benzoxathiol-3-ylidene)bisphenol,s,s-dioxide 4,4’-(3h-2,1-benzoxathiol-3-ylidene)diphenol,s,s-dioxide abcolphenolredf/a fenolipuna Phenol,4,4’-(3H-2,1-benzoxathiol-3-ylidene)bis-,S,S-dioxide phenol,4,4’-(3h-2,1-benzoxathiol-3-ylidene)di-,s,s-dioxide Phenolrde psp(indicator) Sulfonphthal sulphental sulphonphthal sulphonthal Phenol Red, indicator, pure 25GR Phenol red, indicator, ACS Phenol red, solution 0,02%, ACS Phenolsulfonphthalein (100 mg) Phenol Red p.a. PHENOL RED INDICATOR PH 6,4 - 8,2 ACS PHENOL RED (PHENOLSULFONPHTHALEIN) REAG. Phenol Red TS, (U.S.P. Test Solution) Phenol red,ACS Grade NR3C3 nuclear receptor 3C3 PRGR Phenol red (phenolsulfonphthalein) Reag. Ph Eur. Phenol Red, Pure 3,3-bis(p-Hydroxyphenyl)-3H-2,1-benzoxathiol-1,1-dioxide Phenol re 3,3-bis(4-hydroxyphenyl)-3H-benzo[c][1,2]oxathiole 1,1-dioxide Phenol Red Solution 0.5% 2,4,6-Trimethylheptan-4-ol PHENOL RED FREE ACID PHENOL RED INDICATOR, REAG. ACS PHENOL RED 0.5% SOLUTION IN DULBECCO'S*P HOSPHATE BU PHENOL RED CONCENTRATE (2000X)*ELECTROPH ORESIS GRAD PhenolRedIndicatorGr PhenolRedIndicatorSolution PHENOL RED GR ( pH INDICATOR) Phenol Red, conform to ACS, pure Phenol Red, indicator, pure