Poly R decolorization and APPL production by Streptomyces violaceoruber and Streptomyces spiroverticillatus

Abstract

Two mesophilic streptomycetes (S. violaceoruber and S. spiroverticillatus) were selected to study their Poly R-478 decolorization ability and lignocellulose solubilizing activity. Both strains were able to degrade Poly R-478 dye and ferulic acid during growth on a minimal salts medium. The Poly R-478 decolorizing activities of both strains were induced by adding different carbon sources to the culture media. S. violaceoruber could decolorize 63% of Poly R-478 after 24 h. Both strains could solubilize straw and produce acid-precipitable polymeric lignin (APPL) with different efficiency. From the major extracellular enzymes recovery of both strains on rice and wheat straw, we can predicate that the biodegradation process was partial indicating a possible utilization in biological delignification.

Streptomyces spp. as biocatalyst sources in pulp and paper and textile industries: Biodegradation, bioconversion and valorization of waste

“…The study of enzymatic breakdown of lignin and lignocellulose has fortuitously also resulted in the identification of enzymes capable of decolorizing various chromophores such as those found in industrial dye waste streams (Wang, Li, et al, 2018; Wang, Yao et al, 2018). It is been reported that lignocellulose solubilizing microbes were also capable of the decolorization of triphenylmethane and Poly R‐478 dyes (Abou‐Dobara & Omar, 2015; Ball et al, 1989; Vasdev & Kuhad, 1994). The decolorization process typically occurs through the oxidation of the chromophore portions of dyes or other coloured compounds by enzymes such as laccases, azoreductases and peroxidases (Chen et al, 2003; John et al, 2020; Satheesh Babu et al, 2015).…”