Succinylated cellulose-based ampholytic amphiphiles as a novel dual-function emulsifier for the emulsions

Cellulose and STOC (Soluble Tempo-mediated Oxidized Cellulose) were chemically modified with different alkyl succinic anhydride with varying chain lengths including succinic anhydride (SAC0), 2-Octen-1-ylsuccinic anhydride (SAC8), or 2-dodecen-1-yl succinic anhydride to fabricate novel emulsifiers to stabilize the fish oil-in-water emulsion system. After the pretreatment-Tempo-mediated Oxidation, STOC was characterized by Fourier transformed infrared (FTIR), Carboxylated content, Degree of Oxidation, Scanning electron microscopy (SEM), and Gel Permeation Chromatography (GPC). Based on it, the succinylated STOC-based materials (STOC-SAC0, STOC-SAC8, STOC-SAC12) and cellulose-based materials (Cellulose-SAC0, Cellulose-SAC8, Cellulose-SAC12), as a comparison, were investigated. The contact angle of products, particle size, zeta-potential, CLSM of the emulsions, antioxidative activity were studied. Compared with other products, STOC-SAC12 showed a better surface activity with the lowest contact angle. The emulsion coated by STOC-SAC12 formed a more uniform and smaller particle size in the milk-like emulsion system proved by DLC and. Besides, the STOC-SAC12 possessed good antioxidant properties including ABTS radical scavenging and Ferrous chelating ability. Therefore, STOC-SAC12 represents a promising material with potential applications in commercial food items to deliver sensitive oily nutritional ingredients.