The use of processes for simultaneous production of bioproducts as enzymes and bioactive compounds is an interesting alternative to reduce environmental impacts. Thus, the aim of this study was to produce simultaneously, using the biorefinery concept, both proteases and bioactive compounds with antioxidant activity from Bacillus sp. P45 cultivation by using different by-products. The integrated process developed in this study enabled to obtain enzymes with proteolytic and keratinolytic properties in a process with alternate substrates from agro-industrial by-products (feather meal, residual feather meal and biomass), thus, creating an interesting alternative to managing them. The residual biomass provided the highest protease activity (1306.6U/mL) and the reused feather meal reached the highest keratinolytic activity (89U/mL), both at 32h of cultivation. Moreover, hydrolysates produced in cultivation using feather meal and residual biomass had high antioxidant activity, they have great potential as natural antioxidants.

The β-galactosidase is an intracellular enzyme obtained from the yeast Kluyveromyces marxianus and its role is hydrolyse lactose and therefore, is important in the dairy industry. However, for their effective use is necessary to better understand the extraction methods available. The ultrasonic disruption method has been applied as a separation step of intracellular products on laboratory scale and consists of ultrasonic waves dissipation in the solution through cavitation bubbles and produce velocity gradient that creates a force capable of breaking the cells. The aim of this study was to evaluate the rupture ultrasonic extraction of the enzyme β-galactosidase obtained from the yeast Kluyveromyces marxianus CCT 7082 compared with abrasion method using glass beads. The method using ultrasonic ruptor (150 W) with an intermediate tip (70% power) was effective for cell disruption of yeast, showing high enzyme activity and yield, similar values to the extraction method using abrasive glass beads.

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