Abstract
The aim of this work was to evaluate the use of different agro-industrial residues for the production of xylanase by Aspergillus sp. ART 100.1, as well as analyzing the biochemical properties of the enzyme. Agroindustrial residues malt bagasse, pineapple crown, açaí bagasse and soybean husk present in large quantities in the Tocantins region were used to evaluate the production of xylanase. Cultivation conditions for xylanase production were evaluated in submerged and solid-state cultivation. The highest production of xylanase in submerged cultivation was obtained using soybean husk residue (23.60 U/mL), while, for solid-state cultivation conditions, the highest production of xylanase was obtained with malt bagasse (110.00 U/g). The effect of additives to the culture medium was also evaluated, with the best result for the use of the xylose additive in the pineapple crown in solid-state cultivation. The enzyme produced in solid-state cultivation was characterized in terms of pH and temperature. The optimum activity pH was observed at 5.0 and for temperature at 55 °C. The xylanase was stable in a pH range between 4 and 5 and retained 50% of its activity at 45 °C after 110 minutes. The Aspergillus sp. ART 500.1 presents potential for the production of xylanase using agro-industrial residues, enabling the development of bioprocesses for the scaling of production.
Highlights
Some microorganisms produce enzymatic complexes that degrade hemicellulose, cellulose and lignin present in plant cell walls, releasing sugars with potential for applications in fermentation processes, generating products with high economic value [1]
Enzymatic yield, ensuring greater activity compared to bacteria or yeasts, being major producers of xylanase [3]
The highest level of xylanase production was observed with soybean husks (23.60 U/mL), followed by açaí bagasse (16.00 U/mL) with orbital agitation
Summary
Some microorganisms produce enzymatic complexes that degrade hemicellulose, cellulose and lignin present in plant cell walls, releasing sugars with potential for applications in fermentation processes, generating products with high economic value [1]. Enzymes are components of the metabolism of microorganisms responsible for catalyzing chemical reactions essential for cell maintenance, being useful in many applications such as biology, engineering, biotechnology and industry [4]. Xylanases are enzymes responsible for the hydrolysis of β-1,4 glycosidic bonds present in xylan. Xylan is a xylose polymer that is associated with other sugars forming glucuronoxylans, glucuronoarabinoxylans and glucomannans [5]. Xylanases can hydrolyze bonds inside and at the ends of the polymer, being called endoxylanases and exoxylanases [6]
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