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Penicillium oxalicum secretomic analysis identify plant cell wall degrading enzymes important for fruit juice extraction

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Abstract

Pectinases and other carbohydrate-active enzymes are important for the food industry, mainly for juice processing. In addition, the use of peels to produce enzymes can aggregate value to these agro-industrial residues and at the end of the process enhance qualitatively and quantitatively the juice production. In this work, three different extracts produced by Penicillium oxalicum LS09 using agro-industrial residues were optimized and analyzed by mass spectrometry. It was observed an increased production of pectinases in the medium containing orange peel and optimized for production of pectin lyase and pectinesterase (PE). Interestingly, not only pectinases, but also different plant cell wall degrading enzymes (i.e. glucanases, xylanases, arabinases), with a higher ratio (42/73) was identified in the medium optimized for PE. The crude extracts produced by P. oxalicum also reveal the potential for application in the fruit juice industry, showing an increased yield and qualitative characteristics of extracted juices. The presence of other cell wall-degrading enzymes identified by proteomics, reinforce the combination for obtaining clarified and depectinized juice in a single step.

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Fig. 1

source concentration a, pH b and temperature c upon different pectinolytic extracts produced by Penicillium oxalicum. Fungus was growing in basal medium with 0.5% (White square), 1% (Black circle), 2% (White circle) and 3% (Black square) of respective fruit peels. Data represents mean of three replicates ± SE. Values of p < 0.05 (*) and p < 0.01 (**) were considered to be statistically significant

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Acknowledgments

The authors would like to thank Dr. Maria Inez Sarkis from FIOCRUZ for microorganism identification. This work was supported by grant and fellowship from Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq).

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Correspondence to Lucélia Santi.

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Santi, L., Beys-da-Silva, W.O., Berger, M. et al. Penicillium oxalicum secretomic analysis identify plant cell wall degrading enzymes important for fruit juice extraction. J Food Sci Technol 58, 1764–1775 (2021). https://doi.org/10.1007/s13197-020-04688-9

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  • DOI: https://doi.org/10.1007/s13197-020-04688-9

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