Abstract
The interfacial composition of fat globules can change the interfacial structure and further affect the digestive characteristics. In this study, the interaction between whey protein (WP), which is the main protein added in infant formula (IF), and milk fat globule membrane phospholipid (MPL) was investigated from the perspective of simulated fat globule structure, we further characterized the physicochemical properties and the in vitro digestive performance of the emulsions. The results showed that the interaction between MPL and WP changed the secondary and tertiary structures of WP, and formed a dense protective layer at the interface of the fat globule with strong interaction, which improved the emulsification property and physical stability of the emulsion. When MPL: WP was 5:10, the emulsions showed smaller particle size, higher absolute value of zeta-potential and more uniform and stable emulsion state. In addition, during the simulated in vitro digestion of infants, the degree of lipolysis and free fatty acid release content were significantly increased, which improved the fat digestion.
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