Impact of molecular structure of tailored OSA-modified starches on drying behaviours and particle properties

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Abstract
The amphiphilic nature of octenyl succinic anhydride (OSA)[1]-modified starch enables effective emulsion stabilization through its balanced hydrophilic–hydrophobic structure. In this study, five new OSA-starches (OSA-1 to OSA-5) with distinct molecular characteristics were systematically characterized to evaluate their interfacial behaviors and encapsulation performance. Emulsions were subjected to single droplet drying (SDD) to simulate spray drying, and the influence of core-to-wall ratios and drying temperatures on particle formation and functional properties was investigated. Results shows that the core-to-wall ratio significantly affected particle morphology, while drying temperature modulated solubility and encapsulation efficiency. OSA-1 exhibited superior drying performance and encapsulation efficiency at a core-to-wall ratio of 1:3. A drying temperature of 70 °C was found to reduce core material precipitation and enhance solubility of the dried particles. These findings elucidate the structure–function relationship of OSA-starch emulsions during drying and provide practical guidance for the development of stable microcapsules using OSA-starch as a wall material.

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