Standardization of Juniperus macrocarpa Sibt. & Sm. and Juniperus excelsa M. Bieb. Extracts with Carbohydrate Digestive Enzyme Inhibitory and Antioxidant Activities

Juniperus speciesgrowing in Turkey are used for various medicinal purposes in traditional folk medicine. We aimed to evaluate in-vitro antidiabetic (α-glucosidase andα-amylase inhibition assays), antiobesity (pancreatic lipase inhibition assay), and antioxidant (ABTS and DPPH radical scavenging activities, ferric reducing activity, metal chelating activity, and phosphomolybdenum assay) activities of the extracts obtained from branches, leaves, and fruits of Juniperus macrocarpa and Juniperus excelsa. The branch (IC50 = 67.1± 1.7µg/mL) and leaf ethyl acetate extracts (IC50 = 83.4± 0.8µg/mL) of J. macrocarpa exhibited the strongest activity on theα-glucosidase enzyme. Besides that, J. excelsa leaf methanol extract exerted remarkableα-amylase inhibitory activity (IC50 = 950.1± 3.5µg/mL). Only J. macrocarpa branch and J. excelsa leaf ethyl acetate extract slightly inhibited pancreatic lipase enzyme with 2963.3± 736.4 and 2343± 557.8µg/mL IC50 values, respectively. The RP-HPLC-DAD analysis results demonstrated that the more active J. macrocarpa extracts are richer in agathisflavone, amentoflavone, and umbelliferone than J. excelsa extracts. With this study, it is concluded that J. macrocarpa branch and leaf ethyl acetate extracts may be a new source ofα-glucosidase enzyme inhibitory activity and agathisflavone, amentofla...
Source: Iranian Journal of Pharmaceutical Research - Category: Drugs & Pharmacology Source Type: research