Most food-grade Pickering particles nowadays are prepared using purified single-compound substances as starting materials. However, to obtain these substances, complex extraction and purification procedures are often needed. Meanwhile, natural bioactive compounds existing in raw materials are lost. Herein, it is essential to develop a new strategy which could effectively fabricate sustainable and multifunctional particles directly from raw biomass materials. Purple sweet potatoes, rich in bioactive compounds, were used to produce purple sweet potato particles (PSPPs) via wet media milling. The effect of milling time on particle size, morphology, the content and antioxidative activity of bioactive compounds in PSPPs were investigated. Wet media milling could effectively decrease the particle size of PSPPs from 3371 ± 109.98 nm to 312 ± 18.4 nm after 240 min of milling. And significant amounts of bioactive compounds and their antioxidative activity were retained. Pickering emulsions (PSPP-Es) were successfully formed using PSPPs as Pickering stabilizers. The resulting PSPP-Es exhibited good freeze-thaw and heating stability. Low pH (3-6) and strong ionic strength (150 mM-600 mM) conditions contributed to smaller droplet size (10-12 µm) and better storage stability of PSPP-Es due to better complexation between phenolics and major components in PSPPs. Besides, PSPP-Es possessed better lipid oxidative stability than Tween 80-stabilized emulsion due to the presence of intrinsic antioxidants. This work would facilitate the development of Pickering stabilizers with outstanding emulsifying ability and functional properties directly from whole grain materials, and wide application of whole grain particle-stabilized Pickering emulsions in food, cosmetics and pharmaceutical industry.

Development of wet media milled purple sweet potato particle-stabilized Pickering emulsions: the synergistic role of bioactives, starch and cellulose

ACS Spring 2022

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.