objective: achillea is a traditional medicinal herb which contains different phenol and flavonoid compounds that are responsible for achillea pharmacological effects. we aimed to determine phenol and flavonoid contents, besides antioxidant activities of different extracts from achillea eriophoraa (a. eriophora) dc. and achillea biebersteinii (a. biebersteinii) afan. (endemic species in iran) an...

The rational design of 4-hydroxycoumarins with tailor-made antioxidant activities is required nowadays due to the wide variety of pharmacologically significant, structurally interesting of coumarins and researcher orientation toward green chemistry and natural products. A simple and unique coumarins have been achieved by reaction of 4-hydroxycoumarin with aromatic aldehyde accompanied with the ...

Coumarins are secondary metabolites that are widely distributed within the plant kingdom, some of which have been extensively studied for their antioxidant properties. The antioxidant activity of coumarins assayed in the present study was measured by different methods, namely the 1,1-diphenyl-2-picryl-hydrazyl (DPPH(•)) method, cyclic voltammetry and the antioxidant capacity against peroxyl rad...

The antioxidant activity of the crude n-hexane, dichloromethane, and methanol extracts from 25 species belonging to the Asteraceae, Euphorbiaceae, Rubiaceae, and Solanaceae families collected at natural reserves from the Eje Cafetero Ecorregión Colombia, were evaluated by using the spectrophotometric 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical-scavenging method. The strongest antioxidant ...

This study reports the essential oil composition and antioxidant activity of the essential oil extract of aerial parts of Achillea Wilhelmsii. GC/MS analysis identified thirty compounds representing 94.48% of the oil. The main components comprising 86.99% of the oil were α-thujene (6.11%), α-pinene (5.11%), sabinene (5.23%), p-cymene (7%), 1,8-cineole (6%), linalool(10%), camphor (8.43%), thymo...

The essential oil composition of Rhus cotinus L. (syn. Cotinus coggygria Scop.; Family: Anacardiaceae), was analyzed by GC and GC-MS. The in vitro antioxidant activity was assessed by β-carotene bleaching test, reducing power, DPPH radical scavenging and inhibition of lipid peroxidation methods. A total of 30 compounds were identified with the dominance of monoterpenes (65.9%) viz. β-Pinene, ca...

In this study, sulfated low molecular-weight Tremella fuciformis polysaccharides (SLTP) with different sulfate contents were synthesized and their antioxidant activities, including superoxide anion radical, 1,1-diphenyl-2-picryl-hydrazyl (DPPH) radical and hydroxyl radical scavenging activities were investigated. The results indicated that, compared to natural Tremella fuciformis polysaccharide...

The effect of medium doses of γ-irradiation (1-10 kGy) on total phenolic and tannin contents, lipid peroxidation, protein oxidation intensity and soluble protein content of soybean seeds, (genotype Ana), was investigated. Screening for antioxidant ability was performed using FRAP and DPPH methods. Total phenolic and tannin contents and DPPH scavenger activity were increased, while protein oxida...