Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 139 for “"dpph"”.
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Antioxidant activity and phytochemical evaluations of selected medicinal plants
… Scrophularia nodosa was shown to have potent DPPH radical scavenging activity (IC50 = 48.75 ± 7.00 μg/ml). Activity-guided fractionation resulted in the isolation of three principal antioxidant compounds; acteoside, angoroside C and angoroside A. Acteoside (yield = 1.21%, IC50 = 15.2 μM) …
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Avaliação in vitro de atividades citotóxica, antioxidante e antileishmanial do extrato de Bixa orellana (Bixaceae) contra Leishmania braziliensis
… de atividade sequestradora do radical livre DPPH∙ e atividade antileishmanial contra formas promastigotas e amastigotas intracelulares de Leishmania braziliensis. Foi avaliada, ainda, a produção de NO, TNF-α e IL- 10 em sobrenadante de cultura de macrófagos infectados e tratados com o …
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Characterization of antioxidant activities of soybeans and assessment of their bioaccessibility after in vitro digestion
… Oxygen Radical Absorbance Capacity (ORAC), and DPPH™ radical scavenging activities. In order to evaluate efficient preparation methods for soybean antioxidants, three Virginia-grown soybeans were extracted using different extraction strategies. The extraction techniques included soxhlet …
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Caracterização química e potenciais antioxidante antinociceptivo do óleo essencial de Psidium salutare (Kunth) O. Berg
… antioxidantes realizados através do método do DPPH e fosfomolibdênio (capacidade antioxidante total), e dos ensaios antinociceptivos realizados em modelo in vivoatravés dos testes de contorção abdominal e formalina. O possível mecanismo por qual corre a antinocicepção também foi realizado …
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Evaluation of the antioxidant and anti-diabesity potential of cyclopia maculata using in vitro non-cell based screening models
… scavenging and iron reducing ability. The DPPH, ABTS, ORAC and FRAP assays were employed. Anti-diabesity potential was assessed in terms of the inhibition of the digestive enzymes, α-glucosidase and pancreatic lipase
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Moléculas bioativas de Moringa Oleifera: detecção, isolamento e caracterização
… solução do radical 1,1-difenil-2-picrilhidrazil (DPPH) 0,4 mM. Ensaios espectrofotométricos foram realizados (515 nm); extratos foram analisados com vários reagentes para classe de compostos associados com atividade antioxidante. Atividade lectínica foi detectada em extratos salinos a partir de …
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Farming in the city: how the urban environment affects vegetable crop production, soil heavy metal contamination and nutrient dynamics, produce nutritive quality, and insect dynamics in urban gardens
… and two antioxidant capacity assays (FRAP and DPPH). Insect abundance and diversity was measures using yellow sticky traps and pheromone bait traps. Insect pest infestations were quantified weekly through the growing seasons. Micrometeorological sensors adjacent to the gardens measured and …
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Phenolic compounds from selected Namibian leafy vegetables (NLV); extraction and characterization
… (TFC) as well as Diphenyl-1-picrylhydrazyl (DPPH), 2,2-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS), and Reducing Power (RP) assays. The study also aimed at detecting and characterizing eight phenolic acids (4-hydroxybenzoic, trans-ferulic, vanillic, gallic, syringic, sinapic and …
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Antibacterial, antioxidant and phytochemical investigation of Albizia Anthelmintica leaves, roots and stem bark
… reduction and 2,2-diphenyl-1-picrylhydrazyl (DPPH) assays and phytochemical screening was used to determine the major classes of compounds present in the specific plant parts. Phytochemical screening revealed the presence of alkaloids, saponins and diterpenes in roots and bark extracts, …
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Study of melissopalynological, physical and chemical properties, antioxidant and xanthine oxidase inhibition activity of heterotrigona itama honey in Johor, Malaysia
… of honey. Three different antioxidant assays (DPPH scavenging, ABTS decolourization and FRAP), together with phenolic compounds, total phenolic and flavonoid content were also evaluated. Then, enzyme activity was tested by xanthine oxidase inhibition assay. The pollen identification of honeys …
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Microemulsions containing centella asiatica extract as antioxidant and anti-acetylcholinesterase agent
… were also tested for antioxidant activity by DPPH, ABTS, and FRAP assays, anti-acetylcholinesterase activity, in-vitro drug release, and cytotoxicity assay. Four ternary phase diagrams were successfully constructed and based on each ternary diagram, four transparent MEs were selected. The …
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Optimalizace výroby nečokoládových cukrovinek s přídavkem extraktu tužebníku za použití různých sladidel
… testována dvěma metodami, a to pomocí TEAC a DPPH. Výsledky antioxidační aktivity měřené metodou DPPH jsou vyšší, což potvrzuje vyšší robustnost této metody. Oba testy však potvrdily antioxidační aktivitu testovaných vzorků. Nakonec byla testována i antimikrobiální aktivita vzorků pomocí …
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Isolation and characterization of antidiabetic constituents of Bridelia Micrantha
… evaluated using 1,1-diphenyl-2-picrylhydrazyl (DPPH) and ferric reducing power assays. The isolation of the antidiabetic constituents was carried out using column chromatography on silica gel. Purification of the active fraction was carried out using preparative thin layer chromatography (pTLC). …
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Characterization and optimization of bioactive compounds from herbal plants using microwave assisted infusion
… infusion showed 2,2-diphenyl-1-picrylhydrazyl (DPPH) inhibition activity of 64.09%. P. sarmentosum was chosen in MAI as this plant showed good activities in TPC, FRAP and AChE assay. The optimal conditions were 560 W, 495 sec of brewing time and 240 sec of irradiation time. Under optimal …
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Antioxidant and anticholinesterase activities of centella asiatica phenolic extract-mediated gold nanoparticles
… 55 ℃, that is, 69.06 % and 76.72 % for ABTS and DPPH, and 71.71 % and 69.88 % for AChE and BChE, respectively, at the highest concentration of 500 μL sample. However, the maximum % I for ABTS and DPPH scavenging (79.76±1.01 and 75.51±1.54, respectively) was shown by ascorbic acid, and for AChE …
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The Bioactivity and Natural Products of Scottish Seaweeds
… for radical scavenging activity against ABTS, DPPH and superoxide radicals. At least one extract from each brown seaweed showed radical<br/>scavenging of at least 80 % towards ABTS·+ with an ethyl acetate extract of P. fucoides and H. siliquosa quenching DPPH· by at least 90%. Radical …
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Antimicrobial constituents of Artemisia afra Jacq. ex Willd. against periodontal pathogens
… of the extract and compounds was done using the DPPH scavenging method. The extract showed good antioxidant activity with an IC50 value of 22.2 μg/ml. Scopoletin had a strong transformation of the DPPH radical into its reduced form, with an IC50 value of 1.24 μg/ml which was significant to that …
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Ameliorative effect of the methanolic Crude extracts of Inula glomerata and Salacia kraussii on erectile dysfunction in Sprague Dawley rats
… of the crude extracts was tested against DPPH and ABTS radicals. For in vivo studies thirty-five male Sprague Dawley rats were divided into seven groups (with five rats per group). The normal group, n-butanol, n-butanol+ Inula glomerata (50 and 250 mg/kg body weight), n-butanol+ Salacia …
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Antioxidant Nanoparticles as Delivery Systems
… surfactant showed antioxidant activity based on DPPH technique and EPR study, which is not characteristics to commercially available Span80. The newly synthesized EC surfactant was found successful in forming uniform, small size polymeric nanoparticles of intrinsic antioxidant properties. The …
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Nutraceutical antioxidant potential and polyphenolic profiles of the Zambian market classes of bambara groundnuts (Vigna subterranea L. Verdc) and common beans (Phaseolus vulgaris L.)
… The study employed in vitro antioxidant assays (DPPH and FRAP) to screen for antioxidant properties, HPLC-PDA-ESI-MS and Folin Ciocalteu assay to screen for phenolic phytochemical profiles.
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