In‐Situ Production of Modified Starch and Pickering Emulsions by Planetary Ball Milling

GONZÁLEZ, LUCIANA C.; SANTAGAPITA, PATRICIO R.; TOLABA, MARCELA P.

STARCH/STARKE

WILEY-V C H VERLAG GMBH

Año: 2023 p. 1 - 9

0038-9056

Rice starches with different degrees of modification are obtained by highimpact-milling and evaluated as stabilizers of oil/water (O/W) Pickeringemulsions. The objective is to produce in-situ Pickering emulsions in aplanetary ball mill (PBM), analyzing the effect of starch milling time (10, 40,70 min) and starch concentration (3%, 9%, 15%, 21%, 27%) on emulsionattributes such as droplet size (D50,D[4,3]), oil retention (OR) capacity,creaming percentage (C), and stability time (ST). The traditionalhomogenization method using a rotor-stator device is adopted as a reference.By homogenization in PBM, good quality emulsions (droplet size lower than50μm and 18 days stable period) are obtained by using 15% of rice starchmilled during 40 min. In contrast, the emulsion cannot be obtained bytraditional homogenization for the same process conditions. However, with70 min of PBM and 21%–27% of starch content, a long-term ST (60 days) isachieved by means of both homogenization methods. These optimalemulsions show a low droplet size (D50∼10μm) and a great affinity of themilled starch toward the interface in optical microscopy images, whichexplains the significant contribution of starch particles aimed at controllingthe droplet coalescence.