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    Biosurfactants Production Using Permeate from Whey Ultrafiltration and Bioproduct Recovery by Membrane Separation Process

    Year: 2020

    Journal: J. Surfactants Deterg., Volume 23, MAY, page 539–551

    Authors: Decesaro, Andressa; Machado, Thais Strieder; Cappellaro, Angela Carolina; Rempel, Alan; Margarites, Ana Claudia; Reinehr, Christian Oliveira; Eberlin, Marcos Nogueira; Zampieri, Davila; Thome, Antonio; Colla, Luciane Maria

    Organizations: Coordination of Improvement of Higher Education Personnel (CAPES)Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) [001]; Foundation of Amparo to the Research of the State of Rio Grande do Sul (FAPERGS); University of Passo Fundo (UPF)

    Keywords: Microbial growth; Fermentation; Whey; Surfactin; Microfiltration; Surface tension; Emulsification

    The management of whey is a challenge for dairy products where the volume produced is remarkable. This problem is minimized through membrane separation processes (MSP) to obtain whey protein concentrate, which has high added value. However, a permeate effluent stream is still generated that is composed of lactose, vitamins, and minerals, which can serve as raw material for the production of biotechnological compounds. Thus, this study aimed to produce biosurfactants using the permeate from whey ultrafiltration as part of the culture media of the bioprocess, to recover the biosurfactant produced using MSP, and to identify the biocompound. The production was carried out using Bacillus methylotrophicus and Bacillus pumilus. The variables nitrogen source (urea or ammonium sulfate), nitrogen source concentration (0.5% or 1.0%), inducer (soybean oil or biodiesel), inducer concentration (1% or 2%), and the addition of micronutrients (with our without) were studied using a fractional factorial experimental design 2(IV)(5-1). In the fermentation processes, it was possible to verify the biosurfactant production through the reduction of surface tension, obtaining a minimum value of 35.07 mN/m for B. methylotrophicus and 26.02 mN/m for B. pumilus. Recovery via MSP was an efficient strategy for biosurfactant purification, which was concentrated in the fraction of the retentate. We produced a high-value-added biocompound identified as surfactin, valuing the permeate residue from whey ultrafiltration.
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