The inhibition effect of GLP and its degradation products on α-glucosidase. Note: (a) The α-glucosidase inhibition rate of GLP, GLP-HV, GLP-H, and GLP-V; (b) The IC50 value of α-glucosidase inhibition rate of GLP, GLP-HV, GLP-H, and GLP-V; (c) The Lineweaver–Burk curve of α-glucosidase inhibitory dynamics of GLP, GLP-HV, GLP-H, and GLP-V; (d) The fluorescence spectrum analysis on α-glucosidase of GLP, GLP-HV, GLP-H, and GLP-V; (e) The fluorescence spectrum analysis on α-glucosidase of GLP-HV; (f) The Stern-Volmer curve for fluorescence quenching of GLP-HV on α-glucosidase a, b, c, d and e represented significant differences among groups, and p < 0.05 indicates significant differences.