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From Agricultural Waste to Biofuel: Enzymatic Potential of a Bacterial Isolate Streptomyces fulvissimus CKS7 for Bioethanol Production

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Abstract

Purpose

To avoid a negative environmental and economic impact of agricultural wastes, and following the principles of circular economy, the reuse of agricultural wastes is necessary. For this purpose, isolation of novel microorganisms with potential biotechnological application is recommended. The current researches in bioethanol production are aimed to reduce the production costs using low-cost substrates and in-house produced enzymes by novel isolated microorganisms. In line with this, in this study valorization of these agricultural by-products by novel isolate S. fulvissimus CKS7 to biotechnological value added products was done.

Methods

Standard microbiological methods were used for the isolation and characterization of strain. Enzymes activities were determinated using DNS method while, the ethanol concentration was determined based on the density of the alcohol distillate at 20 °C.

Results

The maximal enzymatic activities for amylase, cellulases (carboxymethyl cellulase and Avicelase), pectinase and xylanase were achieved using rye bran as a waste substrate for CKS7 growth. Obtained crude bacterial enzymes were used for enzymatic hydrolysis of lignocellulosic materials including horsetail waste, yellow gentian waste, corn stover, cotton material and corona pre-treated cotton material. The maximum yield of reducing sugars was obtained on horsetail waste and corona pre-treated cotton material. Waste brewer’s yeast Saccharomyces cerevisiae was successfully used for the production of bioethanol using horsetail waste hydrolysate and corona pre-treated cotton material hydrolysate.

Conclusion

The obtained results showed that bacterial strain CKS7 has a significant, still unexplored enzymatic potential that could be used to achieve a cleaner, environmental friendly and economically acceptable biofuel production.

Graphic Abstract

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Acknowledgements

The financial support for this investigation given by the Ministry of Education, Science and Technological Development of the Republic of Serbia under the project TR 31035 is gratefully acknowledged. The authors would like to thank the Dr Darka Marković for providing cotton and corona pre-treated cotton material. Also, the authors would like to thank agricultural cooperative “Mrkšićevi salaši” for obtaining corn waste.

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Correspondence to Katarina Mihajlovski.

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Mihajlovski, K., Buntić, A., Milić, M. et al. From Agricultural Waste to Biofuel: Enzymatic Potential of a Bacterial Isolate Streptomyces fulvissimus CKS7 for Bioethanol Production. Waste Biomass Valor (2020). https://doi.org/10.1007/s12649-020-00960-3

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Keywords

  • Solid state fermentation
  • Streptomyces fulvissimus CKS7
  • Hydrolytic enzymes production
  • Lignocellulosic waste hydrolysis
  • Bioethanol