Abstract
Microbial exopolysaccharides (EPS) are high molecular weight polymers having different sugar residues. EPS have potential applications in different fields, such as medicine, food and environment. Therefore, there is a growing interest in production, characterization and application of EPS from different microorganisms. The present study designed to investigate the production and characterization of EPS from Rhodotorula mucilaginosa YMM19 isolated from Morus nigra L. fruits as well as to examine their potential emulsifying properties. Effect of NaCl concentration, incubation period and pH on the production of EPS was studied. The maximum EPS production by yeast was achieved at 10% NaCl (9741.84 mg/l). The best incubation time for production of EPS was 5 days. Production of EPS decreased under neutral condition and increased at acidic and alkaline condition. The structural feature of EPS was examined by FT-IR and NMR spectral analysis and confirmed the presence of glucose, glucopyranose and galactose. The isolated EPS showed higher emulsification capacity with emulsification activity of 71% and emulsifying index of 60%. The EPS gave strong emulsification for farnesol and was more effective than sodium dodecyl sulphate, a reference emulsifier, in enhancing the herbicidal activity of farnesol against Melilotus indicus under greenhouse condition. The results suggest that the EPS produced by YMM19 strain has a potential to be used as emulsifying agent in pesticide formulations.
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YMMM and MMGS designed the work. YMMM and MMGS conducted the experiments. YMMM, MMGS and SAMA analyzed and interpreted the results. YMMM, MMGS and SAMA drafted the manuscript. SAMA wrote the final manuscript. All authors read and approved the manuscript.
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Mohammed, Y.M.M., Saad, M.M.G. & Abdelgaleil, S.A.M. Production, characterization and bio-emulsifying application of exopolysaccharides from Rhodotorula mucilaginosa YMM19. 3 Biotech 11, 349 (2021). https://doi.org/10.1007/s13205-021-02898-2
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DOI: https://doi.org/10.1007/s13205-021-02898-2