Bromophenol blue BPB supplier Distributor Manufacturer in Kolkata West Bengal india

East India Chemicals is your company for quality chemicals from world-class suppliers Manufacturer of Bromophenol blue  BPB,  to meet your formulation needs in kolkata India.

East India chemicals is one of the leading manufacturer, supplier and exporte of Marine chemical, Construction Chemicals,Miscellaneous Industrial SuppliesOil & Gas,PaintPaper Manufacturing, Pharmaceuticals Plastic Manufacturing,Printing Inks,Soaps & DetergentsTextiles,Water Treatment & Pool allied products and services in kolkata India.

Bromophenol blue (3′,3″,5′,5″-tetrabromophenolsulfonphthalein, BPB, albutest is used as a pH indicator, a color marker, and a dye. It can be prepared by slowly adding excess bromine to a hot solution of phenolsulfonphthalein in glacial acetic acid.

As an acid–base indicator, its useful range lies between pH 3.0 and 4.6. It changes from yellow at pH 3.0 to blue at pH 4.6; this reaction is reversible. Bromophenol blue is structurally related to phenolphthalein (a popular indicator).

use in Dye

Bromophenol blue is also used as a dye. At neutral pH, the dye absorbs red light most strongly and transmits blue light. Solutions of the dye, therefore, are blue. At low pH, the dye absorbs ultraviolet and blue light most strongly and appears yellow in solution. In solution at pH 3.6 (in the middle of the transition range of this pH indicator) obtained by dissolution in water without any pH adjustment, bromophenol blue has a characteristic green red color, where the apparent color shifts depending on the concentration and/or path length through which the solution is observed.