Recycling potato waste for the production of blue pigments by Streptomyces lydicus PM7 through submerged fermentation

• DOI: 10.1186/s40538-024-00612-x
• Publication Date: 2024-07-24T04:01:48Z
• Authors: Álvaro Astudillo; Emilio Hormazábal; Andrés Quiroz; Olga Rubilar; Gabriela Briceño; Roberto Abdala; Claudio Lamilla; María Cristina Diez; Heidi Schalchli
• Keywords: Streptomycetaceae

Abstract Background Discarded potato is the most abundant waste and represents a worldwide disposal problem to industry. This agricultural contains valuable nutrients that could be used as substrate obtain diverse high value-added microbial products, such biopigments. The aim of this work was evaluate use discarded sole source for producing blue pigments by Streptomyces lydicus PM7 through submerged fermentation. Results Initially, traditional culture medium ISP2 established suitable inoculum preparation, it allowed growth rates consumption ~ 75% reducing sugar, leading 1.3 g L −1 dry biomass at 72 h incubation. formulated broth (DPB) evaluated together with five other liquid media (potato dextrose broth, ISP2, ISP3, ISP4, ISP5) S. PM7. highest pigment production obtained using DPB medium, reaching 0.97 , followed ISP5 (~ 0.36 ). In terms evaluating concentration powder, 16 compared concentrations 4, 8, 32 . general, notable increase in total proteins 14 biomass; 8 medium) sugars 5 ) on fifth day fermentation observed, which time began. These data proved able degrade wastes during direct metabolism towards formation Chromatographic analysis revealed main produced new strain complex actinorhodin. Conclusions favored under fermentation, final product almost three times higher than others media. To best our knowledge, first report actinorhodin specie well synthesis based an nutrient process. findings showed potential byproduct replacement commercial same purpose. Graphical