Dual-Responsive “Egg-Box” Shaped Microgel Beads Based on W1/O/W2 Double Emulsions for Colon-Targeted Delivery of Synbiotics

Author:

He Xian1,Qin Yunyun1,Liu Haoyue1,Cheng Kang12,Yang Wanshui1ORCID,Qin Xinsheng1ORCID

Affiliation:

1. Department of Nutrition and Food Hygiene, Center for Big Data and Population Health of IHM, School of Public Health, Anhui Medical University, Hefei 230032, China

2. First Clinical Medical College, Anhui Medical University, Hefei 230032, China

Abstract

In this study, for enhancing the resistance of probiotics to environmental factors, we designed a microgel beads delivery system loaded with synbiotics. Multiple droplets of W1/O/W2 emulsions stabilized with zein–apple pectin hybrid nanoparticles (ZAHPs) acted as the inner “egg,” whereas a three-dimensional network of poly-L-lysine (PLL)-alginate-CaCl2 (Ca) crosslinked gel layers served as the outermost “box.” ZAHPs with a mass ratio of 2:1 zein-to-apple pectin showed excellent wettability (three-phase contact angle = 89.88°). The results of the ζ-potentials and Fourier transform infrared spectroscopy demonstrate that electrostatic interaction forces and hydrogen bonding were the main forces involved in the formation of ZAHPs. On this basis, we prepared W1/O/W2 emulsions with other preparation parameters and observed their microstructures by optical microscopy and confocal laser scanning microscope. The multi-chambered structures of W1/O/W2 emulsions were successfully visualized. Finally, the W1/O/W2 emulsions were coated with PLL-alginate-Ca using the solution extrusion method. The results of the in vitro colonic digestion stage reveal that the survival rate of probiotics in the microgel beads was about 75.11%, which was significantly higher than that of the free. Moreover, probiotics encapsulated in microgel beads also showed positive storage stability. Apple pectin would serve as both an emulsifier and a prebiotic. Thus, the results indicate that the “egg-box” shaped microgel beads, designed on the basis of pH-sensitive and enzyme-triggered mechanisms, can enhance the efficiency of probiotics translocation in the digestive tract and mediate spatiotemporal controlled release.

Funder

University Natural Science Research Project of Anhui Province

early contact scientific research training program for undergraduates in Anhui Medical University

Center for Big Data and Population Health of the IHM Project in the School of Public Health of Anhui Medical University

Postgraduate Innovation Research and Practice Program of Anhui Medical University

Publisher

MDPI AG

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