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Streptomyces tunisiensis DSM 42037 mediated bioconversion of ferulic acid released from barley bran

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Abstract

Streptomyces tunisiensis DSM 42037 exhibited growth capacity on a minimum medium containing 1% barley bran. This peculiar strain released 83.5% of total ferulic acid present in barley bran after 5 days of incubation and the highest amount of released ferulic acid (19 mg/L) was observed on the 3rd day of incubation. The concentrated supernatant of S. tunisiensis also released ferulic acid from the parietal arabinoxylan complex of barley bran. This strain was able to convert the free ferulic acid into 4-vinyl guaiacol (14 mg/L) and acetovanillone (12 mg/L) at molar yield of 97% and 83% respectively. The biotransformation products were successively purified by preparative thin layer and silica gel column chromatography followed by HPLC and identified by 1H nuclear magnetic resonance. Streptomyces tunisiensis DSM 42037 could have potential applications in the food, pharmaceutical and cosmetic industries thanks to its ability in biotransforming ferulic acid into 4-vinyl guaiacol and acetovanillone.

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Acknowledgements

This work was supported by the Tunisian Ministry of Higher Education and Scientific Research. The authors thank Dr Hadeer Lazim, Dr Elise Prost, Dr Serge Turcaud and Prof Jacques Royer for their invaluable help in carrying out this research. We also thank Prof Ezzedine Aouani for the critical reading of the manuscript.

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NS: Conceptualization, carried out the experimental work, Writing—Original Draft. HM: Conceptualization, performed the analysis, Writing—Review & Editing. FL: Design, supervision, Writing—Review & Editing.

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Correspondence to Ferid Limam.

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Slama, N., Mankai, H. & Limam, F. Streptomyces tunisiensis DSM 42037 mediated bioconversion of ferulic acid released from barley bran. World J Microbiol Biotechnol 37, 70 (2021). https://doi.org/10.1007/s11274-021-03031-4

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  • DOI: https://doi.org/10.1007/s11274-021-03031-4

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