The antioxidant activity and the chemical composition of methanol extracts from peel and pulp belonging to two species of Tunisian prickly pears Opuntia ficus indica (spiny and thornless forms) and Opuntia stricta has been studied. The antioxidant capacity was measured by DPPH radical scavenging activity. The Total Phenolic Compound (TPC) and the total flavonoid content were determined by the F...

The study shows the changes of total polyphenol compounds and antioxidant activities of Polygonum multiflorum Thunb root extract during the preservation time by freezing method. In addition, the treatment of initially raw materials by drying process also affects strongly total polyphenol compounds and antioxidant activity. Total phenolic compounds were determined by the Folin Ciocalteu method a...

Aim of the study was to evaluate antioxidant activity and total phenolic content of Achyranthes coynei; an endemic plant used in treatment of several diseases in the same lines that of Achyranthes aspera by traditional practitioners of Belgaum region. Efficiency of extraction methods was studied for aerial parts (leaves, stem, and inflorescence) extracted in methanol using continuous shaking, m...

Cheng A., Chen X., Jin Q, Wang W., Shi J., Liu Y. (2013): Comparison of phenolic content and antioxidant capacity of red and yellow onions. Czech J. Food Sci., 31: 501–508. The total polyphenol (TP), flavonoid, proanthocyanidin (PAC) content, and antioxidant capacity of both onion varieties (red and yellow) were compared. The content of TP, flavonoids, and PAC was determined by Folin-Ciocalteu ...

Four different assays (the Folin-Ciocalteu, DPPH, enzymatic method, and inhibitory activity on lipid peroxidation) based on radically different physicochemical principles and normally used to determine the antioxidant activity of food have been confronted and utilized to investigate the antioxidant activity of fruits originated from Brazil, with particular attention to more exotic and less-stud...

The He-Ne laser (632.8 nm) and photoacoustic spectroscopy (PAS), a variant of the photothermal methods, were combined with Folin-Ciocalteu colorimetry method to determine total phenolics in wine lees. Utilising this we found that polyphenol content nine selected lees varied from 1305 3907 mg/L. gallic acid equivalent was determined by means spectrophotometry using 765 nm as analytical wavelengt...

This research aimed to examine the phytochemical composition, content of polyphenols and flavonoids, antioxidant capacity ethanolic, ethyl acetate, chloroform extract plant species Thymus serpyllum L. The extracts were tested for presence alkaloids, tannins, saponins, phenolic compounds, steroids, terpenoids, cardiotonic glycosides, coumarins. total was determ ined spectrophotometrically with F...

Background: Medang lendir (Litsea glutinosa), a member of the Lauraceae family, is typically found in Kampar Regency area Riau Province, Indonesia. This plant frequently used traditional medicine to treat rheumatism, diarrhea, and dysentery. Objective: To evaluate antioxidant activities L. glutinosa stem bark extracts. Method: was macerated methanol obtain extract, followed by partitioning with...

Abstract Phytochemical and antioxidant activity of quinoa flour was evaluated after subjected to gamma irradiation processes at dose 3 6 kGy. Both non-irradiated irradiated samples were successive extractions in ethanol solvent. The treatment investigated via Ferric reducing power (FRAP) radical-scavenging (RSA) using 2,2-diphenyl-1-picrylhydrazyl (DPPH).Total phenolic flavonoid content analyze...