Article (Scientific journals)
Surface-active properties of surfactin iturin A mixtures produced by Bacillus subtilis
Razafindralambo, Hary; Popineau, Yves; Deleu, Magali et al.
1997In Langmuir, 13 (23), p. 6026-6031
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Keywords :
Surface-active propertiesdynamic adsorption, monolayer stability, micelle, foaming, synergism, interaction
Abstract :
[en] Surface-active properties including dynamic adsorption, monolayer stability, micelle forming capacity, and foaming aptitudes of surfactin-C-15/iturin A-C-15 mixtures were studied. Surfactin-C-15 and iturin A-C-15 molecules interact in synergism on the most surface-active properties evaluated at 20 degrees C at the air-water interface and in aqueous solution (pH 8.0). The synergism is positive on the adsorption effect, monolayer stability, foam density, and liquid stability in foam, whereas it is negative on the adsorption rate. No synergism occurs an micelle forming capacity, but surfactin-C-15 and iturin A-C-15 form mixed micelles when the solution contains a low proportion of surfactin-C-15.ses the synergistic effect is maximum when surfactin-C-15 and iturin A-C-15 molecules are mixed in a 2:3 ratio. This is attributed to the surfactin/iturin A complex formation resulting from specific interactions among two surfactin-C-15 molecules and three iturin A-C-15 molecules. A model of such a complex formation is proposed.
Disciplines :
Agriculture & agronomy
Author, co-author :
Razafindralambo, Hary  ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech
Popineau, Yves
Deleu, Magali  ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech
Hbid, Choukri
Jacques, Philippe ;  Université de Liège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Bio-industries
Thonart, Philippe ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech - Biochimie et microbiologie industrielles
Paquot, Michel ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech
Language :
English
Title :
Surface-active properties of surfactin iturin A mixtures produced by Bacillus subtilis
Publication date :
1997
Journal title :
Langmuir
ISSN :
0743-7463
eISSN :
1520-5827
Publisher :
American Chemical Society, Washington, United States - District of Columbia
Volume :
13
Issue :
23
Pages :
6026-6031
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
BIO4-CT950176
Funders :
Union Européenne = European Union - UE = EU; Belgian Programme of Interuniversity Poles of attraction
Available on ORBi :
since 14 January 2011

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