Synthesis of eco-friendly fatty acid based zwitterionic biosurfactants from coconut oil sources and characterization of their interfacial properties

Abstract

In this study, three different types of fatty acid based biosurfactants were prepared from coconut oil and the successful synthesis was confirmed by using FT-IR, H-1-NMR and C-13-NMR analysis. Interfacial characteristics assessment has shown that all of the prepared FEA surfactants are excellent in surfactant activity and effective in reducing interfacial free energy. In particular, FEA-3 is found to possess good soil removal capacity and emulsification activity since the molecules of FEA-3 surfactant are more closely packed at the interface and thus more efficient at lowering the interfacial energy. Environmental compatibility tests such as biodegradability, oral toxicity, and skin/eye irritation revealed that FEA-3 surfactant is easily biodegradable, mild, non-toxic and non-irritating, suggesting that FEA-3 surfactant can be employed in detergent products formulation. (C) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.