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China Surfactant Detergent & Cosmetics ›› 2021, Vol. 51 ›› Issue (4): 281-287.doi: 10.3969/j.issn.1001-1803.2021.04.003

• Development and application • Previous Articles     Next Articles

Performance and influencing factors of four kinds of lipopeptide biosurfactants

FU Jun-wei1(),WU Juan1(),MEI Ping1,2   

  1. 1. Yangtze University, Jingzhou, Hubei 434023, China
    2. Hubei Cooperative Innovation Center of Unconventional Oil and Gas, Wuhan, Hubei 430100, China
  • Received:2020-09-28 Revised:2021-03-02 Online:2021-04-22 Published:2021-04-27
  • Contact: Juan WU E-mail:18137127293@163.com;wujuan0227@outlook.com

Abstract:

Four biosurfactants (A8, A10-EA, A10-MeOH and B3) were extracted from petroleum bacteria cultured in laboratory. They were all identified as anionic lipopeptide biosurfactants. The curves of equilibrium surface tension and dynamic interfacial tension of A8, A10-EA, A10-MeOH and B3 were determined employing the platinum plate and droplet shape analysis methods, respectively. The emulsifying performance of biosurfactants and their leaching performance on pyrene-polluted soil were studied. The experimental results showed that the critical micelle concentrations (cmc’s) of A8, A10-EA, A10-MeOH and B3 were 1.014 g/L, 5.417 g/L, 0.717 g/L and 0.689 g/L, respectively. Four biosurfactants showed good surface activity in the temperature range of 25~70 ℃. In addition, they had good resistance to monovalent and bivalent salts. The results showed that A8 had the best emulsifying performance for formation of emulsion composed of water and n-decane with the emulsifying coefficient of 65% after 48 h. The interfacial tension could be reduced to lower than 10 mN/m within the studied concentration range. The aqueous solutions of A8 and A10-MeOH at their cmc’s had good leaching effect on pyrene in soil.

Key words: lipopeptide biosurfactant, interface performance, emulsification, leaching

CLC Number: 

  • TQ423.1