Effect of Diffusion on Discoloration of Congo Red by Alginate Entrapped Turnip (Brassica rapa) Peroxidase

Table 1

Characteristics of Congo red [39, 40].

Name of the dye	Congo red
CI number	22120
Chemical name	3,3′-[[1,1′-Biphenyl]-4,4′-diylbis-(azo)] bis[4-amino-1-naphthalenesulfonic acid] disodium salt.
Solubility	Soluble in water, ethanol; very slightly soluble in acetone
Molecular formula	C32H22N6O6S2Na2
Molecular Weight	696.67 g/mol
Color change at pH	Blue (3.0) to red (5.0)
Hue	Red in soluble state (—500 nm)
Chemical class	Di-azo