Synthesis, identification and bioavailability of Juglans regia L. polyphenols-Hohenbuehelia serotina polysaccharides nanoparticles

In order to improve the bioavailability of Juglans regia L. polyphenols (JRP) in human body, the novel Juglans regia L. polyphenols-Hohenbuehelia serotina polysaccharides (HSP) nanoparticles (JRP-HSP NPs) were synthesized based on electrostatic interaction. Moreover, the physicochemical properties, morphologies and gastrointestinal digestive characteristics of JRP-HSP NPs were respectively measured and analyzed. Among four kinds of JRP-HSP NPs prepared by different condition of mass ratio, JRP-HSP NPs (1:16) with encapsulation efficiency of 51.62%, average particle size of 341.0 nm, and zeta potential of −29.3 mv, presented better physicochemical properties, such as thermal stability, photostability and crystalline properties. Morphological analysis revealed JRP-HSP NPs (1:16) appeared spherical and almost uniform. Through evaluation of simulated gastrointestinal digestion, JRP-HSP NPs prevented the variation of phenolic composition induced by gastrointestinal digestion, which was similar as the one of undigested JRP, while un-encapsulated JRP exhibited totally different state due to degradation and biotransformation, suggesting that JRP-HSP NPs possessed the sustained release characteristics in gastrointestinal system. This study provided a non-toxic strategy to encapsulate polyphenols for improving their bioavailability.