The enzymatic decolonization of textile dyes by acidic protease: A review

Proteases are the enzymes which are responsible for the breaking the peptide bonds into amino acid. Acidic protease is the protein digesting enzymes which are activated at a pH value of 2–5 and at a temperature range of 20–70^o C. The protease enzymes are found in various types of organisms such as plants, animals, bacteria and fungi. Our project's major goal is to identify protease-producing microorganisms from soil samples and to characterise protease-producing bacteria. Pleurotusostreatus, Schizophylum commune, Neurosporacrassa, Polyporus sp., Sclerotiumrolfsii, Trametesvillosa, and Myceliophtorathermophila enzyme solutions successfully decolor commercial azo, triarylmethane, antraquinonic, and indigoid textile colors. Enzyme activity is influenced by the kind of substituents on the dyes' ben-zene rings, and hydroxyl and amino groups aid decolorization. Laccase is supplemented with lignin peroxidase and/or manganese peroxidase (P. ostreatus, S. commune, S. rolfsii, N. crassa) to boost decolorization by up to 25%. Auxiliaries for textile dyeing have varying effects relying on the enzymes involved. Copper and iron chelating compounds, as well as anionic detergents, inhibit Polyporus sp. and T. villosa enzymes by up to 20%, while S. commune enzymes decrease up to 70% of their total activity.