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Production and characterization of rhamnolipid biosurfactant from waste frying coconut oil using a novel P seudomonas aeruginosa D
Author(s) -
George S.,
Jayachandran K.
Publication year - 2013
Publication title -
journal of applied microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.889
H-Index - 156
eISSN - 1365-2672
pISSN - 1364-5072
DOI - 10.1111/jam.12069
Subject(s) - rhamnolipid , coconut oil , chemistry , extraction (chemistry) , chromatography , gas chromatography , substrate (aquarium) , food science , pulp and paper industry , pseudomonas aeruginosa , bacteria , biology , genetics , engineering , ecology
Aim To improve biosurfactant production economics by the utilization of potential low‐cost materials. Methods and Results In an attempt to utilize cost‐effective carbon sources in the fermentative production of biosurfactants, various pure and waste frying oils were screened by a standard biosurfactant producing strain. Considering the regional significance, easy availability and the economical advantages, waste frying coconut oil was selected as the substrate for further studies. On isolation of more competent strains that could use waste frying coconut oil efficiently as a carbon source, six bacterial strains were isolated on cetyltrimethyl ammonium bromide–methylene blue agar plate, from a soil sample collected from the premises of a coconut oil mill. Among these, P seudomonas aeruginosa D was selected as the potential producer of rhamnolipid. Spectrophotometric method, TLC , methylene blue active substance assay, drop collapse technique, surface tension measurement by D u N ouy ring method and emulsifying test confirmed the rhamnolipid producing ability of the selected strain and various process parameters were optimized for the production of maximum amount of biosurfactant. Rhamnolipid components purified and separated by ethyl acetate extraction, preparative silica gel column chromatography, HPLC and TLC were characterized by fast atom bombardment mass spectrometry as a mixture of dirhamnolipids and monorhamnolipids. The rhamnolipid homologues detected were Rha‐Rha‐C 10 ‐C 10 , Rha‐C 12 ‐C 10 and Rha‐C 10 ‐C 8 /Rha‐C 8 ‐C 10 . Conclusion These results indicated the possibility of waste frying coconut oil to be used as a very effective alternate substrate for the economic production of rhamnolipid by a newly isolated P s. aeruginosa D . Significance and Impact of the Study Results of this study throws light on the alternate use of already used cooking oil as high‐energy source for producing a high value product like rhamnolipid. This would provide options for the food industry other than the recycling and reuse of waste frying oils in cooking and also furthering the value of oil nuts.