@article {1610, title = {Inhibitory activity against α-amylase and α-glucosidase by phenolic compounds of quinoa (Chenopodium quinoa Willd.) and ca{\~n}ihua (Chenopodium pallidicaule Aellen) from the Andean region of Peru}, journal = {Pharmacognosy Journal}, volume = {13}, year = {2021}, month = {July 2021}, pages = {896-901}, type = {Original Article}, chapter = {896}, abstract = {

Background: Chenopodium quinoa Willd. and Chenopodium pallidicaule Aellen are grains from the Andean region of Peru, which in addition to having a high nutritional value, have health-promoting properties related to the prevention of chronic diseases such as diabetes. Objetive: The present study aimed to identify phenolic compounds associated with an inhibition of carbohydrate hydrolyzing enzymes associated with type 2 diabetes. Material and Methods: Two varieties of quinoa and two varieties of ca{\~n}ihua from the Puno Region in Peru, were evaluated. Total phenolics, total flavonoids, identification of phenolic compounds and antioxidant activity in vitro were measured by Folin-Ciocalteu assay, aluminum chloride colorimetric method, HPLC-DAD and DPPH radical scavenging assay, respectively. In vitro hypoglycemic activity was evaluated through the inhibition of the α-amylase and α-glucosidase enzymes. Results: Gallic acid, rutin and chlorogenic acid were identified by HPLC-DAD in the varieties of quinoa and ca{\~n}ihua. The latter showed significantly higher levels of chlorogenic acid compared to quinoa varieties (p\<0.05). Both Andean grains exhibited inhibition of key-enzymes linked to type 2 diabetes, presenting IC50 values of 7.99 to 34.05 and of 8.07 to 1158 μg/mL for α-amylase and α-glucosidase, respectively. Total phenolics, total flavonoids, DPPH radical scavenging assay, gallic acid and chlorogenic acid showed the greatest contribution to the inhibitory activity of the α-glucosidase enzyme (p\<0.05). Conclusion: Our findings suggest that the phenolic compounds present in the varieties of quinoa and ca{\~n}ihua could modulate the inhibition of carbohydrate hydrolyzing enzymes associated with type 2 diabetes.

}, keywords = {Andean grains, DPPH radical scavenging assay, HPLC-DAD, in vitro antidiabetic activity, Polyphenols}, doi = {10.5530/pj.2021.13.115}, author = {Jorge Coronado-Olano and Ritva Repo-Carrasco-Valencia and Oscar Reategui and Emily Toscano and Elisa Valdez and Mirko Zimic and Ivan Best} }