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    Impact of oxygen supply on surfactin biosynthesis using brewery waste as substrate

    Year: 2021

    Journal: J. Environ. Chem. Eng., Volume 9, AUG

    Authors: Nazareth, Talita Correa; Zanutto, Conrado Planas; Maass, Danielle; Ulson de Souza, Antonio Augusto; Guelli Ulson de Souza, Selene Maria de Arruda

    Organizations: Amazonas Research Foundation (FAPEAM); infrastructure of Laboratory of Mass Transfer (LABMASSA) of Federal University of Santa Catarina (UFSC); Sao Paulo Research Foundation (FAPESP) [2019/07659-4]

    Keywords: Biosurfactant; Surfactin; Brewery waste; Bioreactor; Volumetric oxygen mass transfer coefficient

    This work reports surfactin production by B. subtilis ATCC 6051 in a stirred tank bioreactor, where trub was used as a carbon source. Trub is a residue from the brewing industry mainly composed of high-molar-mass proteins and reducing sugars, being a sustainable and low-cost substrate for bioprocess. Despite this, Trub has been little explored as a raw material in bioprocesses. Aiming to evaluate important factors in scale-up process, the impact of oxygen transfer coefficient (K(L)a) concerning volumetric productivity, and the effect of agitation (150-300 rpm) and aeration (0.5-1.5 vvm) on biosurfactant production by a Full Factorial design were evaluated. Only agitation presented a significant effect on surfactin concentration (SF), where SF was described by a linear regression model (R-2 = 0.99). The biosurfactant showed high stability in relation to variations in temperature and pH. In addition, the foam collecting was an efficient method in recovering and enrichment of the product.
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