Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8328516 | International Journal of Biological Macromolecules | 2018 | 28 Pages |
Abstract
We identified that Pseudomonas guguanensis produced macromolecular mono-rhamnolipid (1264.52â¯Da) upon sensing n-hexadecane/diesel/kerosene from its surroundings. Permutation experiments were done to improve the laboratory-scale mono-rhamnolipid production (ie, a three-fold increase) using RSM validation. Consequently, maximal mono-rhamnolipids production [40-50â¯mg/L] and emulsification abilities [65-70%] were encountered on day 8 using vegetable oil, peptoneâ¯+â¯yeast extract. EI24 values for the rhamnolipids were found to be 78±1.75% at 12.5â¯mg/â¯mL. Production and secretion of rhamnolipids were accompanied by aggregation of cells at day 6 as pictured in SEM. Pure monorhamnolipids of P. guguanensis was found to lower the surface tension of water to 32.98±0.3â¯mN/m than the crude and CFSs of P. aeruginosa indicating efficient activity. Utilization and subsequent removal of hexadecane was 77.2% and the breakdown products were fatty acids [decanoic, hexadecanoic, octadecanoic acids and methyl stearates] as signified in Head-space GC-MS. The breakdown products of hexadecane are also present in the synthesized rhamnolipids suggesting their biosynthetic role. Rapid degradation of hexadecane, diesel and kerosene by this emulsifier combined with non-pathogenic trait of P. guguanensis identifies this organism as a viable option to remove n-alkanes from aquatic environments.
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Authors
RamyaDevi. K. C, Lakshmi Sundaram. R, Asha D, Sivamurugan. V, Vidya Vasudevan, Mary Elizabeth Gnanambal. Krishnan,