Bromocresol purple *CAS 115-40-2* *Ultrapure grade*

Bromocresol purple

CAS 115-40-2; Ultrapure grade

Bromocresol purple (BCP) or 5',5-dibromo-o-cresolsulfophthalein, is a pH indicator. In its sultone form, it has a pKa value of 6.3, and is usually prepared as a 0.04% aqueous solution. Besides its primary function as an indicator, bromocresol purple is used in medical laboratories to measure albumin.

Protocol

SDS

COA

Catalog	Size	Price	Quantity
92	25 g	Price

Calculators

Common stock solution preparation

Table 1. Volume of Water needed to reconstitute specific mass of Bromocresol purple *CAS 115-40-2* *Ultrapure grade* to given concentration. Note that volume is only for preparing stock solution. Refer to sample experimental protocol for appropriate experimental/physiological buffers.

	0.1 mg	0.5 mg	1 mg	5 mg	10 mg
1 mM	185.11 µL	925.549 µL	1.851 mL	9.255 mL	18.511 mL
5 mM	37.022 µL	185.11 µL	370.22 µL	1.851 mL	3.702 mL
10 mM	18.511 µL	92.555 µL	185.11 µL	925.549 µL	1.851 mL

Molarity calculator

Enter any two values (mass, volume, concentration) to calculate the third.

Mass (Calculate)		Molecular weight		Volume (Calculate)		Concentration (Calculate)		Moles
mg	÷	540.22 g/mol	=	mL	x	mM	=	mmol

References

View all 32 references: Citation Explorer

Albumin concentration determined by the modified bromocresol purple method is superior to that by the bromocresol green method for assessing nutritional status in malnourished patients with inflammation

Authors:

Ueno T, Hirayama S, Ito M, Nishioka E, Fukushima Y, Satoh T, Idei M, Horiuchi Y, Shoji H, Ohmura H, Shimizu T, Miida T.

Journal:

Ann Clin Biochem (2013): 576

Using polyvinyl chloride dyed with bromocresol purple in radiation dosimetry

Authors:

Kattan M, al Kassiri H, Daher Y.

Journal:

Appl Radiat Isot (2011): 377

Serum globulins contribute to the discrepancies observed between the bromocresol green and bromocresol purple assays of serum albumin concentration

Authors:

Xu Y, Wang L, Wang J, Liang H, Jiang X.

Journal:

Br J Biomed Sci (2011): 120

Mechanism for the color change in bromocresol purple bound to human serum albumin

Authors:

Ito S, Yamamoto D.

Journal:

Clin Chim Acta (2010): 294

Identification of two bromocresol purple binding sites on human serum albumin

Authors:

Ito S, Yamamoto D.

Journal:

Clin Chim Acta (2010): 1536

Physical properties

Molecular weight	540.22
Solvent	Water

Storage, safety and handling

H-phrase	H303, H313, H333
Hazard symbol	XN
Intended use	Research Use Only (RUO)
R-phrase	R20, R21, R22
Storage	Room temperature (10-25 °C); Minimize light exposure
UNSPSC	12171501
CAS	115-40-2

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Page updated on October 15, 2025