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  • Title: Production of starch nanoparticles by dissolution and non-solvent precipitation for use in food-grade Pickering emulsions.
    Author: Saari H, Fuentes C, Sjöö M, Rayner M, Wahlgren M.
    Journal: Carbohydr Polym; 2017 Feb 10; 157():558-566. PubMed ID: 27987962.
    Abstract:
    The aim of this study was to investigate non-solvent precipitation of starch to produce nanoparticles that could be used in Pickering emulsions. The material used was waxy maize, modified with octenyl succinic anhydride. Different methods of non-solvent precipitation were investigated, and a method based on direct mixing of an 8% starch solution and ethanol (ratio 1:1) was found to produce the smallest particles. The particle size was measured using AFM and AF4, and was found to be in the range 100-200nm. However, both larger particles and aggregates of nanoparticles were observed. The emulsion produced using the precipitated starch particles had a droplet size that between 0.5 and 45μm, compared to emulsions produced from waxy maize granules, in which had a size of 10-100μm. The drop in size contributed to increased stability against creaming. The amount of starch used for emulsion stabilization could also be substantially reduced.
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