Abstract
In this study, a series of octyl-modified alginates (H-SA) were successfully synthesized via covalently coupling various amounts of octylamine (OA) to sodium alginate (SA) and was then characterized by multiple techniques. Despite its poor surface tension reduction effectiveness, the synthesized H-SA could effectively reduce the oil-water interfacial tension. Therefore, the H-SA was used to emulsify various types of oils, and their emulsification performances were evaluated in terms of the oil droplet size and emulsion viscosity after emulsification. It was found that the emulsifying efficiency was enhanced with increasing octyl substitution degree (OSD) over the studied range. Moreover, the influences of pH value and salt content on the emulsifying efficiency were also investigated in detail. Overall, H-SA can be easily synthesized, providing a promising biodegradable emulsifier for the oil emulsification in an aqueous environment.
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