Journal
BIOPROCESS AND BIOSYSTEMS ENGINEERING
Volume 45, Issue 1, Pages 31-44Publisher
SPRINGER
DOI: 10.1007/s00449-021-02635-2
Keywords
Lipopeptide; Date flour; Valorization; Taguchi design; Surface activity; Chelation
Funding
- Ministry of Higher Education and Research of Tunisia
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This study demonstrated the valorization of date flour through the production of a lipopeptide biosurfactant (BioS) by Bacillus subtilis ZNI5, showing promising surface activity properties and potential applications in the bioremediation of heavy metals.
The present study summarizes the valorization of date flour by the production of lipopeptide biosurfactant (BioS) by Bacillus subtilis ZNI5 (MW091416). A Taguchi design permitted the formulation of a medium composed only of 6% date flour and 0.5% yeast extract within 2 days of incubation at 150 rpm with a maximal surface tension (ST) reduction of about 27.8 mN/m. The characterization of the lipopeptide shows a CMC value of about 400 mg/L with a minimal ST of 30 mN/m and an ability to disperse oil to about 80 mm at 800 mg/L. Having reduced phytotoxicity, the ZNI5 BioS and ZNI5 strain were assayed for Copper and Cobalt chelation and biosorption. The improvement of the germination index of radish seeds irrigated by the treated contaminated water showed the great potential application of ZNI5 lipopeptide in the bioremediation of heavy metals.
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