Co-utilization of canola oil and glucose on the production of a surfactant by Candida lipolytica.
Candida lipolytica synthesized a surfactant in a cultivation medium supplemented with canola oil and glucose as carbon sources. Measurements of biosurfactant production and surface tension indicated that the biosurfactant was produced at 48 h of fermentation. The surface-active species is constituted by the protein-lipid-polysaccharide complex in nature. The cell-free broth was particularly influenced by the addition of salt, the pH and temperature depending on the emulsified substrate (hexadecane or a vegetable oil). After comparison between ethyl acetate and mixtures of chloroform and methanol as solvent systems for surfactant recovery, it was found that ethyl acetate was able to extract crude surfactant material with high product recovery (8.0 g/L). The isolated biosurfactant decreased the surface tension to values of 30 mN/m at the critical micelle concentration. Emulsification properties of the biosurfactant produced were compared to those of commercial emulsifiers and other microbial surfactants.
Sarubbo
Leonie A
LA
Departamento de Química, Universidade Católica de Pernambuco, Rua do Príncipe, n. 526, Bl D, Boa Vista Cep 50050-900, Recife-Pernambuco, Brasil. leonie@unicap.br
Farias
Charles B B
CB
Campos-Takaki
Galba Maria
GM
D002175:Candida / Q000378:metabolism*; D005229:Fatty Acids, Monounsaturated / Q000378:metabolism*; D005947:Glucose / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D007218:Industrial Microbiology; D000074262:Rapeseed Oil; D012965:Sodium Chloride / Q000378:metabolism; D013501:Surface-Active Agents / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism*; D013696:Temperature
D005229:Fatty Acids, Monounsaturated; D000074262:Rapeseed Oil; D013501:Surface-Active Agents; D012965:Sodium Chloride; D005947:Glucose