title: Study of the synergistic effects of salinity, pH, and temperature on the surface-active properties of biosurfactants produced by Lactobacillus pentosus.
abstract: Many studies have investigated the effects of pH, temperature, and salinity on the surface-active properties of various surfactants, although in most cases the variables have been studied separately, without considering the effects of any interactions between them. In the present study, a Box-Behnken factorial design was applied to study the effects of pH, temperature, and salinity on the surface-active properties of a biosurfactant produced by Lactobacillus pentosus. The data obtained enabled development of a second-order model describing the interrelationships between operational and experimental variables, by equations including linear, interaction, and quadratic terms. The variable that had the greatest effect on the surface-active properties of the biosurfactant was pH. Moreover, at pH 3-5.5, decreases in salinity and temperature acted synergistically, reducing the surface tension of the biosurfactant; at pH 8, the same effect was observed with increasing salinity and temperature.
authors.affiliation: Chemical Engineering Department, University of Vigo , ETS Ingenieros Industriales, Vigo, Pontevedra, Spain. xanel.vecino@uvigo.es
authors.forename: Xanel Vecino
authors.initials: XV
authors.lastname: Bello
authors.forename: Rosa
authors.initials: R
authors.lastname: Devesa-Rey
authors.forename: José Manuel
authors.initials: JM
authors.lastname: Cruz
authors.forename: Ana Belén
authors.initials: AB
authors.lastname: Moldes
mesh_terms: D006863:Hydrogen-Ion Concentration; D007778:Lactobacillus / Q000737:chemistry / Q000378:metabolism*; D054712:Salinity; D013499:Surface Properties; D013501:Surface-Active Agents / Q000737:chemistry* / Q000378:metabolism; D013696:Temperature
chemical_list: D013501:Surface-Active Agents