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    Biosurfactants produced by Pseudomonas syringae pv tabaci: A versatile mixture with interesting emulsifying properties

    Year: 2020

    Journal: Process Biochem., Volume 97, OCT, page 121–129

    Authors: Haidar, Carla N.; Pereira, Matheus M.; Lima, Alvaro S.; Nerli, Bibiana B.; Malpiedi, Luciana P.

    Organizations: ANPCyTANPCyT [PICT 1712/2017]; CONICETConsejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET) [PIP 505/2015, PUE 2016]; Universidad Nacional de Rosario [BIO 422]

    Keywords: Lipopeptides; Surface tension; Critical micelle concentration; Emulsification index; Emulsion stabilizing capacity

    In recent years, worldwide awareness about environmental concerns has led to an extensive searching for products of natural origin. Biosurfactants (BS), are an attractive alternative to the chemical counterparts. In these sense, this works evaluate for the first time the emulsifying and surface activity of biosurfactants produced by P. syringae pv. tabaci. Chemical characterization revealed that the produced BS extract mostly consisted in a mixture of syringopeptins and arthrofactins. Besides, this sample was able to reduce water surface tension up to 36.89 mN/m. This activity was improved by modifying conditions of pH, temperature and salinity. For instance, the surface tension was reduced up to 29 mN/m when using NaCl 5 % w/w. The BS also exhibited a high emulsifying activity, this being comparable or even superior to that of commercial bioemulsifiers such xanthan, Cara and guar gums. A notorious emulsification index, close to 90 %, was exhibited by BS in coconut oil/water mixtures. Moreover, emulsifying activity resulted to be little affected by different operational conditions, thus retaining about 80 % of its emulsificant index in presence of 20 % w/w of NaCl at 80 degrees C. These findings are indicative of the BS promising properties and its potential as additive in a variety of industrial applications.
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