Bromocresol Green (BCG) is a pH sensitive dye of the triphenylmethane family (triarylmethane dyes). It belongs to a class of dyes called sulfonephthaleins. It shows yellow color below pH of 3.8 and blue color above pH of 5.4 and is thus useful as a pH indicator. The pKa of bromocresol green is 4.90.
|Name of Product||Bromocresol Green|
|Synonyms||Bromocresolgreen; 3',3'',5',5''-Tetrabromo-m-cresolsulfonephthalein; Tetrabromo-m-cresolphthalein sulfone; Bromocresol Verde; Verde de bromocresol; Vert de bromocrésol|
|Molecular Weight||698.0 g/mol|
|1||Appearance (form)||Solid Powder or Crystals|
|2||Appearance (color)||Beige to brown|
|4||Solubility||Very soluble in Ethanol and Diethyl Ether
Soluble in benzene
Sparingly soluble in water
|5||Melting Point||225 °C (437 °F; 498 K)|
|7||UV-vis (λmax)||423 nm|
Q. At what pH does bromocresol green change color?
Bromocresol green (BCG) is a sulfonphthalein dye, with a transition range of pH 3.8 to 5.4. It is yellow in acidic solutions (below pH 3.8) and blue in basic solutions (above pH 5.4).
Q. How does bromocresol green work with albumin?
Albumin in the presence of bromocresol green at a slightly acidic pH causes the indicator to change color from yellow-green to green-blue. The intensity of the color produced is related to the concentration of albumin in the sample.
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