Effects of Quillaja Saponin on Physicochemical Properties of Oil Bodies Recovered from Peony (Paeonia ostii) Seed Aqueous Extract at Different pH

Peony seeds, an important oil resource, have been attracting much attention because of α-linolenic acid. Oil bodies (OBs), naturally pre-emulsified oils, great potential applications in the food industry. This study investigated effects extraction pH and Quillaja saponin (QS) on physicochemical properties peony body (POB) emulsions. POBs were extracted from raw milk at 4.0, 5.0, 6.0, 7.0 (named 4.0-, 5.0-, 6.0-, 7.0-POBs). All contained extrinsic proteins oleosins. The 4.0- 5.0-POB 23 kDa 38 glycoproteins, unknown 48 60 kDa, while completely removed under condition 6.0 7.0. percentage gradually decreased 78.4% 4.0-POB to 33.88% 7.0-POB, oleosin contents increased. particle size zeta POB emulsions decreased, whereas oxidative stability, storage pI increased with increasing pH. QS (0.05~0.3%) negative charges all emulsions, 0.1% significantly improved dispersion, storage, stability provides guidance for selecting proper conditions aqueous improving OB