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    Bioconversion of low-cost brewery waste to biosurfactant: An improvement of surfactin production by culture medium optimization

    Year: 2021

    Journal: Biochem. Eng. J., Volume 172, 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: Brewery waste; Trub; Surfactin; Biosurfactant; Bioreactor

    Trub is the second-largest residue from brewing industry (250 thousand tons/year) and, due to the presence of high amounts of carbon and nitrogen, it is a potential source of reducing sugars and nitrogen for biological processes. Therefore, this work aimed to enhance surfactin production by Bacillus subtilis using Trub as a carbon source. The effect of nitrogen sources on biosurfactant production was investigated by a full factorial design (2(2)). Yeast extract and its interaction with peptone presented a statistically significant effect on the response variable of surface tension (ST). ST was described by a linear regression model (R-2 = 0.93). The effect of metals supplementation on the culture medium was also investigated, where the volumetric productivity increased from 2.98 to 7.43 mg L-1 h(-1) for the medium without (M-I) and with metals (M-II), respectively. After 28 h, 210.11 mg L-1 was obtained in the batch culture with M-II medium, being higher than the maximum surfactin concentration achieved after 52 h (121.80 mg L-1) for M-I medium. The biosurfactant production in bioreactor was successfully performed since a concentrated extract was obtained in the foam collected, reaching the maximum of 1118.20 mg L-1 of surfactin.
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