Dioscorea hispida Dennst atau di Indonesia dikenal dengan umbi gadung diketahui mengandung senyawa aktif fenol yang dapat memberikan aktivitas antioksidan. Ekstraksi dari masih belum banyak diteliti. Tujuan penelitian ini adalah untuk mengekstraksi menggunakan metode ultrasonic-assisted extraction (UAE) pelarut bervariasi yaitu air, etanol, dan metanol serta menguji antioksidannya. Penentuan ka...

the aim of the study was to evaluate the antioxidant and free radical scavenging properties and to determine the phenolic content of the ethanol extract from five mentha species [m. longifolia (l.) huds., m. piperita l., m. pulegium l., m. rotundifolia (l.) huds., and m. spicata l.]. the antioxidant activities of the extracts were investigated with two different methods, 2,2’-diphenyl-1-picrylh...

this study was designed to examine the in vitro antioxidant activities and total phenolic contents of the methanolic extracts from male inflorescence of salix aegyptiaca l. grown in iran. the methanolic extract (me) and its three fractions including water (wf), butanol (bf) and chloroform (cf) were prepared and then their antioxidant activities, as well as total phenolic contents, were evaluate...

In this study, it was investigated the total amounts of phenolic and flavonoid substances antioxidant activities in different solvent extracts Lonicera iberica M. Bieb. wild fruit. Total contents were determined as equivalent to gallic acid using Folin-Ciocalteu reagent, quercetin by aluminium nitrate method. addition, properties free radical scavenging (DPPH) reducing power (FRAP) methods. The...

In the present study, levels of Total Phenols compounds (TPC) and antioxidant capacity different extracts from leaves Cassytha filiformis (C. filiformis), Commiphora schlechteri schlechterii), Ochna natalitias (O. natalitia) Pavetta assimilis (P. assimilis) were evaluated by Folin-Ciocalteu ferric ion reduction methods, respectively. The prepared with solvents polarities (n-hexane, dichlorometh...

Summary Introduction: There is a high interest in creating medicines, dietary supplements, cosmetics including plant extract with antioxidant activity. For understanding whether has maximum level of activity it important to know the total raw material. Objective: The main goal study was find out green tea leaves Methods: measured by potentiometric method. Total phenolic, flavonoids, catechins a...

Objetivo: evaluar la actividad antioxidante y antiinflamatoria en extractos hidroalcohólicos de las partes aéreas Kalanchoe daigremontiana Raym. -Hamet & H. Perrier. Materiales métodos: se obtuvieron utilizando como solventes etanol (EtOH) metanol (MeOH) diferentes concentraciones. Los fenoles totales los flavonoides cuantificaron con el método Folin Ciocalteu complejación aluminio respecti...

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...