Ultrasonic assisted synthesis of octenyl succinylated starch and its application as stabilizer of Pickering emulsions

L. ALTUNA; M.L. HERRERA; M. L. FORESTI

Mar del Plata

Simposio; XVI Simposio Latinoamericano de Polímeros (SLAP 2018)/ XIV Congreso Iberoamericano de Polímeros (CIP 2018).; 2018

INTEMA - UNMdP

Octenyl succinylated starch (OS-starch) is synthesized byesterification in aqueous slurry under mild alkaline conditions and at roomtemperature yielding an additive with amphiphilic properties. Due to itsamphiphilic character, OS-starch finds application as an emulsion stabilizer,and the stability of the emulsion depends on the degree of substitution (DS)1and the distribution of the OS groups within the starch granules2. Characterizationof OS-starches has shown that the reaction is mainly a surface phenomenon, dueto the heterogeneous character of the system, the semicrystalline nature of thestarch granules, and the low solubility of octenyl succinic anhydride (OSA) inthe aqueous medium3. Therefore, increasing the granules surfacecould allow increasing the reaction efficiency (RE) and the DS during thesynthesis of OS-starch. Ultrasonic (US) treatment of starch granules has beenfound to increase granules? surface due to particle size reduction4and generation of cavities and fractures5. The objective of thiswork was to perform ultrasonic treatment to maize starch prior to esterificationwith OSA and evaluate its performance as an emulsion stabilizer.