Tsaokopyranols A-M, 2,6-epoxydiarylheptanoids from Amomum tsao-ko and their α-glucosidase inhibitory activity.
Bioorg Chem
; 96: 103638, 2020 03.
Article
in En
| MEDLINE
| ID: mdl-32062448
ABSTRACT
The dried fruits of Amomum tsao-ko are well-known dietary spices and traditional Chinese medicines. The random screen revealed that 50% ethanol-water extract of A. tsao-ko demonstrated significant α-glucosidase inhibitory activity with an IC50 value of 38.6 µg/mL. Bioactivity-guided isolation on the active fraction afforded 13 new 2,6-epoxy diarylheptanoids, tsaokopyranols A-M (1-13), and four known ones (14-17). Their structures featuring a 2,6-epoxy pyran ring were established by extensively spectroscopic analyses (HRESIMS, IR, UV, 1D and 2D NMR) and ECD calculations. Seven new (4-6, 8-11) and one known (16) compounds showed obvious α-glucosidase inhibitory activity with IC50 values ranging from 59.4 to 116.5 µM, higher than acarbose (IC50 219.0 µM). An enzyme kinetic analysis indicated that compounds 12 and 13 were noncompetitive-type inhibitors of α-glucosidase with Ki values of 539.6 and 385.2 µM. This result provided new insights for the usage of A. tsao-ko, and 2,6-epoxydiarylheptanoids as new anti-diabetic candidates.
Key words
Full text:
1
Database:
MEDLINE
Traditional Medicines:
Medicinas_tradicionales_de_asia
/
Medicina_china
Main subject:
Amomum
/
Diarylheptanoids
/
Alpha-Glucosidases
/
Glycoside Hydrolase Inhibitors
Language:
En
Journal:
Bioorg Chem
Year:
2020
Type:
Article