Aromatic Plants: Antioxidant Capacity and Polyphenol Characterisation

Abstract

Abstract:The antioxidant properties and polyphenol content of some selected aromatic plants grown in Greece were studied. Plants were refluxed with 60% methanol after acid hydrolysis. The phenolic substances were quantified by HPLC-DAD. The antioxidant capacity of the extracts was determined with the Rancimat test using sunflower oil as substrate. Free radical scavenging activity was measured using the stable free radical 1, 1-diphenyl-2-picrylhydrazyl (DPPH). Results were compared with standard BHT and ascorbic acid. Total phenol concentration of the extracts was estimated with Folin-Ciocalteu reagent using gallic acid as standard.

Flavonoid Constituents of Phlomis (Lamiaceae) Species Using Liquid Chromatography Mass Spectrometry

“…, benzyl alcohol glycosides (caffeoylquinic acid derivatives), fatty acids and aliphatic compounds (9,12octadecadienoic acid methyl ester and hexadecanoic acid methyl ester), and neolignan glucoside (dehyrodiconiferyl alcohol-4-O-β-D-glucopyranoside) were also reported in previous researches from Phlomis species using 1D and 2D-NMR, FAB-MS, RP-HPLC, GC-MS and HPLC-DAD (Calis et al, 1990;Takeda et al, 2001;Valant-Vetschera et al, 2003;Saracoglu et al, 2003;Harput et al, 2006;Yalcin et al, 2006;Zhang and Wong, 2008;Hussain et al, 2010;Zardoost and Gheibi, 2011;Ullah et al, 2013;Sarikurkcu et al, 2014;Bader et al, 2015;Delnavazi et al, 2016;Zafari-Shayan et al, 2016;Proestos and Varzakas, 2017). Based on different chemical contents, the genus Phlomis was divided into different chemotypes (Amor et al, 2009).…”

“…and Ph. herba-venti L. using TLC, GC-MS, GC-FID, NMR, MPLC and HPLC techniques (Alipieva et al, 2000;Kamel et al, 2000;Takeda et al, 2001;Ersoz et al, 2001;Harput et al, 2006;Akramian et al, 2010;Hussain et al, 2010;Proestos and Varzakas, 2017). In addition, flavonoid p-coumaroylglucosides, Iridoid derivatives (barlerin, sesamoside, phloyoside II, shanzhiside methyl ester, acteoside or verbascoside and daucosterol) and phenylethanoid glycosides (salidroside) were identified from Ph.…”

Protective effect of juice extract of mesocarp rind of Citrullus lanatus in carbon tetrachloride-induced oxidative stress in rats

“…Dietary antioxidants play a crucial role in delaying or thwarting the oxidation of lipids or other cellular compounds by hindering the initiation or prolongation of oxidative chain reactions [37]. The phytoconstituents present in extracts of medicinal plants are progressively used as a natural source of antioxidants in the manufacture of food or are taken directly as raw ingredients [38].…”