Bromocresol purple (BCP), also referred to as 5,5″-dibromo-o-cresolsulfophthalein, is a member of the class of 2,1-benzoxathioles and is a pH sensitive dye of the triphenylmethane family (triarylmethane dyes). It is a hydrophilic dye used as a pH indicator and for several purposes including the determination of serum albumin concentrations. It has a pKa value of 6.3.
|Name of Product||Bromocresol purple|
|Synonyms||5′,5′′-Dibromo-o-cresolsulfonephthalein; Bromocresol Roxo; Púrpura de bromocresol; Bromocresol Purpura; Pourpre de bromocrésol; Bromcresol purple|
|Molecular Weight||540.2 g/mol|
|1||Appearance (form)||Solid powder or granules|
|2||Appearance (color)||Purple to Pinkish-brown|
|3||Solubility||Insoluble in water, Soluble in ethanol (80 mg/ml), alcohol, methanol (4 mg/ml), methyl cellosolve (300 mg/ml) and dilute alkalies|
|4||Melting Point||241 to 242 °C|
|5||Dissociation Constant (pKa)||6.3|
|6||Total Dye Content||Min. 95 %|
|7||Loss on Drying (at 110°C, 1 hr)||NMT 1.0 %|
Q. What is the pH range of Bromocresol purple indicator?
Bromocresol purple (BCP) is a triarylmethane dye, with a transition range of pH 5.2 to 6.8. It is yellow in acidic solutions (below pH 5.2) and violet in basic solutions (above pH 6.8).
Q. What is the absorption spectrum of Bromocresol purple?
Bromocresol purple shows an absorbance peak at 212 nm.
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