Bioactive pterocarpans from the root of Astragalus membranaceus var. mongholicus

Eleven undescribed and three known pterocarpans were isolated and identified from the traditional Chinese medicine “Huang-qi”, Astragali Radix (the root of Astragalus membranaceus var. mongholicus (Bunge) P.K.Hsiao). The structures of these pterocarpans were determined using spectroscopic, X-ray crystallographic, quantum chemical calculation, and chemical methods. Pterocarpans, almost exclusively distributed in the family of Leguminosae, are the second largest subgroup of isoflavanoids. However, pterocarpan glycoside number is limited, most of which are glucosides, and only one pterocarpan apioside was isolated from nature. Notably, nine rare apiosyl-containing pterocarpan glycosides were isolated and identified. The hypoglycemic activities of all these compounds were evaluated using α-glucosidase and DPP-IV inhibitory assays respectively, and some isolates displayed the α-glucosidase inhibitory function. The antioxidant activities of all compounds were evaluated using the ORAC and DPPH radical scavenging assays, respectively. All compounds exhibited varying degrees of oxygen radical absorbance capacity, and some compounds displayed DPPH radical scavenging ability. Eleven undescribed and three known pterocarpans were isolated and identified from the traditional Chinese medicine “Huang-qi”, Astragali Radix (the root of Astragalus membranaceus var. mongholicus (Bunge) P.K.Hsiao), and their α-glucosidase inhibitory and antioxidant activities were evaluated. [Display omitted] •14 pterocarpans were isolated from the traditional Chinese medicine “Huang-qi”.•11 undescribed pterocarpan glycosides comprising nine rare apiosides were reported.•The discovery of 11 undescribed isolates added new members of pterocarpans.•Some compounds displayed the α-glucosidase inhibitory function.•Compounds showed ORAC and DPPH radical scavenging activities.