Extraction, Structural Analysis, and Bioactivity of a Novel Polysaccharide From Corydalis yanhusuo Residues

This research extracted and purified polysaccharides from Corydalis yanhusuo residue. The structure of purified polysaccharides of Corydalis yanhusuo (CYP-1) was characterized by methods such as infrared spectroscopy, nuclear magnetic resonance, and monosaccharide composition analysis. In addition, the purified polysaccharides were subjected to preliminary studies in vitro for antioxidant and antitumor activities. The average molecular weight of CYP-1 was 1.427 × 10³ kDa. FT-IR analysis revealed that CYP-1 displayed characteristic absorption bands typical of polysaccharides. Furthermore, NMR spectroscopy suggested that the sugar residue units of CYP-1 consisted of →1)-α-D-Glcp-(4→, →6)-α-D-Galp-(1→, and α-D-Arap-(1→. In vitro bioactivity experiments revealed that CYP-1 exhibits antioxidant activity and effectively inhibits HepG2 cell proliferation with an IC₅₀ value of 1.381 mg/mL, suggesting its potential as a natural antioxidant and antitumor agent.