Influence of carbon sources on biosurfactant production by Cyberlindnera fabianii
2023
Eryasar-Orer, Kubra | Olutas, Elif Berna | Karasu-Yalcin, Seda
Biosurfactants are surface-active molecules produced by various microorganisms. Fermentation media composition plays a key role in biosurfactant production and it could be enhanced when both lipophilic and hydrophilic carbon sources, such as glucose and fatty acids, are used in the media. In this research, each of glucose, fructose, sucrose and glycerol were used by their combination with several vegetable oils (sunflower, hazelnut, rapeseed, corn, cottonseed, and olive) for production of biosurfactant by Cyberlindnera fabianii MIAU-1. The total 24 experiments were conducted in shake flasks and the most suitable substrates for the production were selected based on the results of surface tension reduction (STR) of the media. The minimum and maximum STR values of the medium containing glucose and its combination with oils were between 19.44–26.57 mN mE−1. These values were 15.91–23.73 mN mE−1 and 13.26–26.55 mN mE−1 for fructose and sucrose containing media, respectively. Overall, the highest STR results were taken in the media composed of glucose-sunflower oil, glucose-hazelnut oil, glucosecorn oil and sucrose-hazelnut oil, which were about 26–26.50 mN mE−1. In addition, the minimum STR was found to be 8.49 mN mE−1 for the glycerol and cottonseed oil containing medium. In general, the medium composed of glucose and sunflower oil was chosen based on being more economic and accessible for biosurfactant production. These results revealed that food wastes such as fruit and vegetable peels rich in sugars and waste frying oil could have considerable potential for the biosurfactant production by Cyb. fabianii strain.
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