Bromocresol Green

(BCG) is a dye of the triphenylmethane family (triarylmethane dyes). BCG is used as a pH indicator and as a tracking dye for DNA agarose gel electrophoresis. It also binds quantitatively with human albumin forming an intense blue-green complex. Transition Interval: pH 3.8 (yellow) to pH 5.4 (blue). 
 Applications

Bromocresol Green is useful in a variety of colorimetric detection technologies. It is used as a tracking dye for DNA agarose gel electrophoresis, in protein determinations and in charge-transfer complexation processes. In TLC, it is used for visualisation of the compounds with functional groups whose pKa is below 5.0.At present, the reliable source for procuring Bromocresol green in the ACS grade i.e. GSPChem, is in process of developing use of this product for food-packaging application, wherein the label printed with Bromocresol Green dye, will change color from yellow to Blue as soon as the shelf life of the product ends.