Jingwen Xu,1,2 Yue Zhang,1,2 Xiaolin Yao,1 Sijuan Wang,1,2 Kaiqiang Lv,1,2 Guangwen Luo,1,2 Jiaqi Wang,1,2 Guoliang Li1 

1School of Food Science and Engineering, School of Biological and Pharmaceutical Sciences, Shaanxi University of Science & Technology, Xi’an, 710021, People’s Republic of China; 2Xi’an Key Laboratory of Antiviral and Antimicrobial-Resistant Bacteria Therapeutics Research, Xi’an, 710021, People’s Republic of China

Correspondence: Guoliang Li, Email 61254368@163.com

Introduction: To improve the bioavailability of trans-resveratrol (trans-Res), it is commonly co-delivered with antioxidant bioactives using a complex synthetic intestinal targeted carrier, however, which makes practical application challenging.
Methods: A nanogel (Ngel), as broad-spectrum autonomous ROS scavenger, was prepared using selenized thiolated sodium alginate (TSA-Se) and crosslinked with calcium lactate (CL) for loading trans-Res to obtain Ngel@Res, which maintained spherical morphology in the upper digestive tract but broke down in the lower digestive tract, resulting in trans-Res release.
Results: Under protection of Ngel, trans-Res showed enhanced stability and broad-spectrum ROS scavenging activity. The synergistic mucoadhesion of Ngel prolonged the retention time of trans-Res in the intestine. Ngel and Ngel@Res increased the lifespan of Caenorhabditis elegans to 26.00 ± 2.17 and 26.00 ± 4.27 days by enhancing the activity of antioxidases, upregulating the expression of daf-16, sod-5 and skn-1, while downregulating the expression of daf-2 and age-1.
Conclusion: This readily available, intestinal targeted selenized alginate-based nanogel effectively improves the bioactivity of trans-Res.

Keywords: trans-resveratrol, seleno-alginate, synergistic antioxidant, mucoadhesion, intestinal targeted delivery