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Fungi from industrial tannins: potential application in biotransformation and bioremediation of tannery wastewaters

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Abstract

Tannins are a complex family of polyphenolic compounds, widely distributed in the plant kingdom where they act as growth inhibitors towards many microorganisms including bacteria, yeasts, and fungi. Tannins are one of the major components of tannery wastewaters and may cause serious environmental pollution. In the present study, four different tannins (the hydrolysable chestnut ellagitannin and tara gallotannin and the condensed quebracho and wattle tannins) were characterized from a mycological point of view with the aim of selecting fungal strains capable of growing in the presence of high tannin concentration and thus potentially useful in industrial biotransformations of these compounds or in the bioremediation of tannery wastewaters. A total of 125 isolates of filamentous fungi belonging to 10 species and four genera (Aspergillus, Paecilomyces, Penicillium, and Talaromyces) were isolated from the tannin industrial preparations. Miniaturized biotransformation tests were set up with 10 fungal strains and the high-performance liquid chromatography (HPLC) analysis pointed out a strong activity of all the tested fungi on both chestnut and tara tannins. Two strains (Aspergillus tubingensis MUT 990 and Paecilomyces variotii MUT 1125), tested against a real tannery wastewater, were particularly efficient in chemical oxygen demand (COD) and tannin removal (> 60%), with a detoxification above 74%. These results indicate that these fungi are potentially exploitable in the treatment of tannery wastewaters.

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Funding

This work was supported by Ministero dell’Istruzione, dell’Università e della Ricerca (MIUR) with the FIRB project RBFR13V3CH_002 with the title “In situ bioaugmentation to exploit the combination of fungi and bacteria for recalcitrant compounds removal.”

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Correspondence to Giovanna Cristina Varese.

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This article does not contain any studies with human participants performed by any of the authors.

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The authors declare that they have no competing interests.

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Prigione, V., Trocini, B., Spina, F. et al. Fungi from industrial tannins: potential application in biotransformation and bioremediation of tannery wastewaters. Appl Microbiol Biotechnol 102, 4203–4216 (2018). https://doi.org/10.1007/s00253-018-8876-x

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  • DOI: https://doi.org/10.1007/s00253-018-8876-x

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