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DPPH scavenging
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To investigate the influence of the banana ripening stage on the change in the content of bioactive components and their bioactivities, ripening stages of porcelain banana peels were screened for the total phenolic content (TPC) and antioxidant activities using three methods, including DPPH scavenging assay, ferric reducing/antioxidant power (FRAP) assay, and inhibition of polyphenol oxidase activity (PPO assay).
9p
vimichaelfaraday
28-12-2023
11
3
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In this research, a set of experiments was carried out for identifying the optimum conditions of independent variables affecting phenolic content extraction efficiency and antioxidant activity of soybean seeds (Glycine max L.).
6p
viisac
23-09-2023
2
1
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This study assesses the antioxidant potential of mushroom Calocybe indica with the 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical and 2,2′-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) (ABTS) radical scavenging methods and the total antioxidant capacity.
8p
vispiderman
15-06-2023
5
1
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The aims of this study were to investigate the antioxidant and antimicrobial activities of some spice plants including cinamon bark, ginger root, curcuma root and piper leaves. The terms for investigation of antioxidant activity were DPPH radical scavenging activity and ferric reducing power.
7p
vidoctorstrange
06-05-2023
4
3
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This study aimed to investigate the stability of Terminalia nigrovenulosa (T. nigrovenulosa) extract in response to heating treatment and hydrogen peroxide at pH 4 and pH 7. The changes of total polyphenol content, DPPH radical scavenging and reducing power were examined. The obtained results showed that the investigated extract was relatively stable under heating and sterilization condition (pH 4). However, it was unstable at pH 7.
9p
vidoctorstrange
06-05-2023
6
3
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We have carried out studying for antioxidant activity of 58 extracts prepared from vegetables and fruits in Viet Nam by three methods including DPPH and H2O2 scavenging activity assays and determination of total flavonoid content (TFC). Ethanol extract of Tamarind seed (NTBT-17), Grape seed (NTBT-19) and Mangosteen peel (TNB-10) showed high amount of TFC which is 848.8, 655.9 and 422.9 mgQE/100g, respectively.
8p
vidoctorstrange
06-05-2023
6
3
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This study screened phytochemicals to determine their total polyphenols content (TPC) by Folin-Ciocalteu reagents and to evaluate antioxidant activity using DPPH scavenging, ABTS cation decolorization, and reducing power assays of various extracts of Symplocos cochinchinensis leaves. A correlation between TPC and antioxidant activity was analysed by Pearson’s method.
6p
vicedric
08-02-2023
4
1
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A phytochemical investigation on the ethanolic (EtOH) extract of the Vietnamese Curcuma longa (C. longa) rhizomes has led to the isolation of four curcuminoids including curcumin (1), demethoxycurcumin (2), bisdemethoxycurcumin (3), and cyclocurcumin (4). The chemical structure of compounds 1-4 was elucidated by Nuclear magnetic resonance (NMR) and Mass spectrometry (MS) spectral data.
5p
vimalfoy
08-02-2023
5
2
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This study uses sunflower hulls, a by-product from the sunflower snack industry, to recover both, valuable phenolic compounds and cellulose fibers, for the production of antioxidant reinforced starch films as potential food packaging material. The phenolic extract provided antioxidant properties to the films with EC50 values of 89 mg film/mg DPPH.
7p
viginny
30-12-2022
14
2
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The aim of this study is to estimate phytochemical constituents and antioxidant activities of tomato slices treated by microwave heating. Two treatments time were applied, 30 and 300 s. Quantitative analyses of phenols, flavonoids, lycopene, followed by the evaluation of the antioxidant activity by DPPH (2,2-diphenyl-1-picrylhydrazyl) and ion chelating methods, were conducted on ethanolic extracts.
5p
schindler
30-12-2021
6
0
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The aim of this study was to determine the effect of different drying methods on the nutritional content and antioxidant activity of purslane. Two different purslane samples have been dried using four different methods (sun, vacuum, hot air, and freeze drying). Dried and fresh samples were analyzed for their dry matter, β-carotene content, chlorophyll a and chlorophyll b contents, total flavonoid content, total flavonol content, total phenolic content, %DPPH radical scavenge activity, metal chelating activity, and color.
10p
hanthienngao
30-11-2021
10
2
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We report herein the first synthesis of biologically active natural bromophenols, namely 1-(2,3,6-tribromo4,5-dihydroxybenzyl)pyrrolidin-2-one (2), 2RS-1-(2,3-dibromo-4,5-dihydroxybenzyl)-5-oxopyrrolidine-2-carboxylic acid (3), and 2RS-methyl 1-(2,3-dibromo-4,5-dihydroxybenzyl)-5-oxopyrrolidine-2-carboxylate (4), along with their different derivatives (6 and 8–18). Among the synthesized compounds, 3, 4, and their derivatives (8 and 9) are yielded in racemic form.
34p
tudichquannguyet
29-11-2021
9
1
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Benzodithiophenes are heterocyclic compounds that have various medicinal and industrial applications. In the present study, halobenzodithiophene, the simplest benzofused thiophene, and its derivatives were synthesized and evaluated against alpha-glucosidase, urease, and free radical production. In the alpha-glucosidase inhibition assay, compound 2,2-bisbenzothiophne (1) exhibited potent activity with IC50 = 135 ± 0.51 µM, while its derivative 2,7-bis(butoxycarbonyl)-3,6-dichlorobenzo[1,2- b ;6,5- b ’]dithiophene (2) exhibited promising inhibition with IC50 = 263 ± 0.32 µM.
11p
tudichquannguyet
29-11-2021
15
1
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2-Substituted 8-propargyloxyquinoline derivatives have been synthesized from 2-substituted-8-hydroxyquinolines by O-propargylation method (30%–98% yields). The newly synthesized compounds were tested for in vitro antioxidant activities such as DPPH radical scavenging, ferrous chelating, and reducing power activities. The maximum radical scavenging (46.5%) and reducing power activities were obtained from 1 and maximum ferrous chelating effect was obtained from 6 (72.1%) at the concentration of 500 µg/mL. To indicate DNA binding activity of the complexes calf thymus DNA was used.
12p
tudichquannguyet
29-11-2021
13
1
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One-pot synthesis of novel quinoline- and quinolone-substituted 1,2,3-triazoles has been performed from the key intermediates, quinoline- and quinolone-substituted propargyl derivatives 1–3 (48%–88% yields). The antioxidant properties of the newly synthesized compounds, 1a–1c, 2a–2c, and 3a–3c, were evaluated by monitoring DPPH (2,2- diphenyl-1-picrylhydrazyl) radical scavenging abilities, metal chelating effects, and reducing power. The scavenging effects of compounds on the free radical decreased in the order of 3b > 3a > 1b and were found to be 36.3%, 34.9%, and 27.
14p
tudichquannguyet
29-11-2021
13
0
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In the present study, the antioxidant properties of peripherally and nonperipherally water-soluble tetra (quinoline 5-sulfonic acid) substituted metal-free (1, 2), Zn(II) (3, 4), Co(II) (5, 6), and Mn(III)Cl (7, 8) phthalocyanine (Pc) derivatives were reported. In order to determine the antioxidant properties of the Pc compounds, three different commonly known antioxidant methods were used: DPPH (α,α-diphenyl-β-picrylhydrazyl) radical scavenging, ferrous ion chelating, and reducing power assays.
10p
tudichquannguyet
29-11-2021
10
0
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Calendula officinalis L. is a commercially important plant that finds application in the treatment of various diseases in traditional medicine. The total antioxidant capacity, radical scavenging activity, and total phenolic content of marigold extracts were investigated by Folin, CUPRAC, and DPPH assays, respectively. The optimum operating conditions of microwave-assisted extraction (MAE) including temperature, extraction time, solvent-to-solid ratio, and solvent concentration were ascertained by employing response surface methodology (RSM).
15p
tudichquannguyet
29-11-2021
13
0
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Schiff base derivatives with anthracene- and pyrene-based units, A1-A6 and P1-P6 were synthesized (89%–99% yields). Schiff base derivatives were designed to possess an heterocyclic moiety on one side to enhance the coordination ability towards metals. To investigate the biological assay of the newly synthesized compounds, their DPPH (2,2-diphenyl-1-picrylhydrazyl) radical scavenging, metal chelating, reducing power, antibacterial and DNA binding activities were tested. A6 (63.1%) showed the maximum free radical scavenging activity among all.
16p
tudichquannguyet
29-11-2021
6
1
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In this paper, the protective role of melatonin in counteracting metal-induced free radical generation was highlighted. Using the HPLC-FLD technique melatonin was identified and quantified in the roots and leaves of lemon balm (Melissa officinalis L.), grown under photoperiod conditions. Furthermore, the response of plants pre-treated with exogenous 0.1 mM melatonin to the increased zinc (Zn) and cadmium (Cd) concentrations was observed, with changes in mineral (Ca, Mg), physiological and antioxidant status of the plant during heavy metals stress.
12p
tudichquannguyet
29-11-2021
13
1
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In this study, methanol extracts (MEs) and essential oil (EO) of Angelica purpurascens (Avé-Lall.
11p
tudichquannguyet
29-11-2021
3
0
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