scholarly journals Total Antioxidant Activity and Total Phenolic Contents in Different Turkish Eggplant (Solanum Melongena L.) Cultivars

2009 ◽  
Vol 12 (3) ◽  
pp. 616-624 ◽  
Author(s):  
Bilal Okmen ◽  
Hasan O. Sigva ◽  
Sevgi Mutlu ◽  
Sami Doganlar ◽  
Ahmet Yemenicioglu ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Solanum Melongena ◽  
Total Phenolic ◽  
Total Antioxidant Activity ◽  
Phenolic Contents ◽  
Total Phenolic Contents ◽  
Total Antioxidant

scholarly journals Effect of Electrospinning Process on Total Antioxidant Activity of Electrospun Nanofibers Containing Grape Seed Extract

2019 ◽  
Vol 17 (1) ◽  
pp. 912-918 ◽  
Author(s):  
Rabia Faki ◽  
Oguz Gursoy ◽  
Yusuf Yilmaz
Keyword(s):  
Antioxidant Activity ◽  
Grape Seed Extract ◽  
Grape Seed ◽  
Electrospinning Process ◽  
Seed Extract ◽  
Total Phenolic ◽  
Total Antioxidant Activity ◽  
Phenolic Contents ◽  
Total Phenolic Contents ◽  
Total Antioxidant

AbstractElectrospinning is a common technique used for the production of nanofibers, and it is based on the fact that the electrically charged liquid polymer is positioned in a continuous fiber form on a grounded surface. Grape seed is rich in phenolic compounds and can be used as a dietary supplement or as a natural antioxidant source in diet. In this study, grape seed extract of Burdur Dimrit variety (Vitis vinifera L.) was electrospun with gelatin, polyvinyl alcohol (PVA) and PVA/β-cyclodextrin polymers to produce nanofibers with antioxidant activity. The aim of this study was to determine the effect of the electrospinning process on the total antioxidant activity and total phenolic contents of electrospun polymers with grape seed extracts. Total antioxidant activity of samples (by ABTS and DPPH assays) and total phenolic contents (Folin–Ciocalteu method) were determined before and after the electrospinning process of polymers with grape seed extract. Electrospinning with gelatin polymer decreased the antioxidant activity (ABTS assay) of nanofibers containing grape seed extract by 65% and their total phenolic contents by 7%. However, electrospinning treatment with PVA and PVA/β-cyclodextrin had no effect on the total antioxidant activity (ABTS and DPPH) and total phenolic substance contents of grape seed extract nanofibers.

scholarly journals Loranthus pulverulentus: A Potent Source of Natural Antioxidants and Alternative Medicine

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Muhammad Asam Raza ◽  
Rukhsana Kausar ◽  
Faraz Ali Rana ◽  
Muhammad Danish ◽  
Durre Shahwar ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Ethyl Acetate ◽  
Natural Antioxidants ◽  
Stem Bark ◽  
Antioxidant Potential ◽  
Total Phenolic ◽  
Strong Correlations ◽  
Phenolic Contents ◽  
Total Phenolic Contents ◽  
Total Antioxidant

This study was designed to evaluate the antioxidant potential ofLoranthus pulverulentus. Stem bark, leaves, and seeds ofLoranthus pulverulentuswere extracted in methanol:water (90 : 10) and partitioned with n-hexane, chloroform, ethyl acetate, and n-butanol successively using partition chromatography. Total phenolic contents and antioxidant potential were checked using standard protocols. Total phenolic contents of all extracts were determined, using Folin–Ciocalteu reagent, and ranged between 151 ± 2.1 and 396 ± 1.6 for stem bark, 137 ± 0.9 and 430 ± 2.2 for, and 39 ± 0.6 and 231 ± 1.7 for seeds. The antioxidant potential of extracts was evaluated; namely, DPPH, FRAP, and total antioxidant models. The ethyl acetate extract of stem-bark, leaves, and seeds showed the highest activity in DPPH (94.5 ± 2.1%, 96.30 ± 0.9%, and 92.30 ± 1.1%, IC5015.9 ± 0.5 μg, 14.5 ± 0.8, and 102.7 ± 1.3, resp.), FRAP (7.7 ± 0.6, 7.5 ± 0.7 and 6.6 ± 0.7, resp.), and total antioxidant (0.95 ± 0.09, 1.19 ± 0.09, and 0.686 ± 0.08, resp.). Strong correlations were observed between total phenols versus total antioxidant activity, DPPH, and FRAP withR2values ranging from 0.8185 to 0.9951 (stem-bark), 0.6728 to 0.8648 (leaves), and 0.8658 to 0.9910 (seed) which indicated that phenolic contents are the major constituents responsible for antioxidant activity.

SKRINING FITOKIMIA DAN UJI AKTIVITAS ANTIOKSIDAN DAN ANTITUMOR 20 TUMBUHAN OBAT ASAL KABUPATEN MANOKWARI

2008 ◽  
Vol 7 (1) ◽  
Author(s):  
Bimo Budi Santoso
Keyword(s):  
Antioxidant Activity ◽  
Medicinal Plants ◽  
Antitumor Activity ◽  
Traditional Method ◽  
Extraction Efficiency ◽  
Phenolic Content ◽  
Antioxidant Activities ◽  
Total Phenolic ◽  
Phenolic Contents ◽  
Total Phenolic Contents

<strong><em>Flavanoid, steroid, and terpenoid contents of 20 Manokwari medicinal plants were analyzed.  The antioxidant activity, total phenolic contents and antitumor activity of 20 Manokwari medicinal plants were also evaluated. The result shows that 83% positif to flavanoid test, 59% positif to terpenoid test and only 25% positif steroid. Antioxidant activity and total phenolic contents evaluated using Ferric Thiocianate (FTC) and Folin-Ciocalteu methods respectively. Antioxidant activity and total phenolic contents of medicinal plants were extracted by the traditional method, boiling in water and also in 80% methanol. Twenty plants evaluated in both exstracts have significantly varies of antioxidant activities and phenolic contents,  A significant and linier correlation coefficient between the antioxidant activity and the total phenolic content was found in both aqueous (R<sup>2</sup>= 0,77) and methanol (R<sup>2</sup> = 0,85). Antitumor activity was tested using cell maurine P-388 and only 2 of medicinal plants are active to inhibit cell maurine P-388. Comparing extraction efficiency of the two methods, the methanol extracted phenolic compounds more efficiently, and antioxidant activity of the extract was higher.</em></strong>

scholarly journals Variation in antioxidant activity at two ripening stages of wild mango, Spondias pinnata (L.f.) Kurz., an underutilized fruit

2020 ◽  
Vol 7 (4) ◽  
Author(s):  
Bince Mani ◽  
Sinjumol Thomas
Keyword(s):  
Nitric Oxide ◽  
Hydrogen Peroxide ◽  
Antioxidant Activity ◽  
Radical Scavenging ◽  
Reducing Power ◽  
Total Phenolic ◽  
Total Antioxidant Activity ◽  
Plant Origin ◽  
Nitric Oxide Radical ◽  
Total Antioxidant

Antioxidant compounds play a significant role in preventing and scavenging free-radicals by reducing oxidative stress and providing protection to humans against degenerative diseases and infections. Obviously, antioxidant molecules of plant origin are pivotal to combat the oxidative harm in cells. Present work intended to evaluate the antioxidant capacity of the fruits of Spondias pinnata. Methanol extracts of the fruits at two stages of maturity were prepared and investigated by various antioxidants analyses such as total antioxidant activity, reducing power and radical scavenging assays (DPPH, nitric oxide and hydrogen peroxide). Its total phenol, flavonoid and tannin contents were also determined. Spondias pinnata fruit extracts exhibited effective antioxidant activity and its IC50 values of the unripe fruits were 65, 66, 72.23, 83.25, 66.75 ?g/ml and ripe fruits were 124.24, 92.50, 97.66, 144.10, 72.25 ?g/ml, for total antioxidant activity, reducing power, DPPH radical scavenging, nitric oxide radical scavenging and hydrogen peroxide scavenging assays respectively. The extracts, especially unripe fruit extract had good amounts of total phenolic and flavonoid contents which might contribute the antioxidant activities considerably. It is evident from the study that the fruits of S. pinnata possessed potent antioxidant activity and it can be considered as a good dietary choice among the underutilized fruits as well as common fruits. Therefore, wild mango may be a good choice of antioxidants of plant origin for dietary and pharmaceutical uses.

Quantitative Analysis of Total Phenolic Contents and Antioxidant Activity of Fresh Field Natural Rubber Latex

2015 ◽  
Vol 354 (1) ◽  
pp. 265-272 ◽  
Author(s):  
Suwimon Siriwong ◽  
Adisai Rungvichaniwat ◽  
Pairote Klinpituksa ◽  
Khalid Hamid Musa ◽  
Aminah Abdullah
Keyword(s):  
Antioxidant Activity ◽  
Quantitative Analysis ◽  
Natural Rubber ◽  
Natural Rubber Latex ◽  
Total Phenolic ◽  
Rubber Latex ◽  
Phenolic Contents ◽  
Total Phenolic Contents

scholarly journals Storage study of cereal bars formulated with banana peel flour

2018 ◽  
Vol 48 (3) ◽  
pp. 386-396 ◽  
Author(s):  
Vania Silva Carvalho ◽  
Ana Carolina Conti-Silva
Keyword(s):  
Antioxidant Activity ◽  
Phenolic Compounds ◽  
Storage Period ◽  
Banana Peel ◽  
Total Phenolic ◽  
Total Antioxidant Activity ◽  
Total Phenolic Compounds ◽  
Content Type ◽  
Total Antioxidant ◽  
Cereal Bars

Purpose This paper aims to examine the bioactive compounds and texture properties of cereal bars formulated with banana peel flour during storage. Design/methodology/approach Seven cereal bars were produced and stored during 11 months, under vacuum and protected from the light. The total phenolic compounds, the activity antioxidant by ABTS [2,2′-Azino-bis(3-ethylbenzothiazoline-6-sulfonic acid)] method, the DPPH (2,2-diphenyl-1-picryl-hydrazyl-hydrate) method expressed as EC50 (concentration required to reduce the original amount of free radicals by 50 per cent) and texture properties were evaluated over the storage period. Findings In general, total phenolic compounds decreased during storage (from 4.19 to 1.11 mg GAE. g-1f.w.). Although the total antioxidant activity (ABTS method) increased during the fifth month, it reduced during storage (from 3.41 to 0.30 µmol TE.g-1f.w.); and the EC50 was not modified in many formulations, though it decreased in other formulations during storage period (from 3913 to 19221 g fruit.g-1 DPPH). The force of rupture began to increase in the fourth month (reaching 62.4 N), and hardness began to increase in the ninth month (reaching 444 N). The formulation and time factors influenced the total phenolic compounds, total antioxidant activity (ABTS method), force of rupture and hardness, while EC50 was only influenced by the formulation (p-value = 0.001). A principal component analysis showed that time had little effect on the most important characteristics considered in description of the cereal bars. Originality/value Cereal bars can be consumed up to the third month of storage, considering the texture of the products. Moreover, the presence of bioactive compounds in cereal bars depends on the addition of banana peel flour, which it contributes to the insertion of total phenolic compounds and total antioxidant activity in cereal bars, aggregating functional properties in these products.

scholarly journals Bioactive compounds content and total antioxidant activity of two savoy cabbages

2014 ◽  
Vol 32 (No. 6) ◽  
pp. 549-554 ◽  
Author(s):  
M.A. Fernández-León ◽  
M. Lozano ◽  
D. González ◽  
M.C. Ayuso ◽  
M.F. Fernández-León
Keyword(s):  
Antioxidant Activity ◽  
Bioactive Compounds ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Total Phenolic ◽  
Total Antioxidant Activity ◽  
Fresh Weight ◽  
Total Antioxidant ◽  
In Vitro Antioxidant Activity

The bioactive compounds, as well as the in vitro antioxidant activity of two Savoy cabbage cultivars, Dama and Leticia, grown in west of Spain under similar conditions were identified, quantified and compared. We found that cv. Dama presented in general betters results when compared with cv. Leticia. Cv. Dama presented higher concentrations of chlorophyll a (2.26 mg/100 g fresh weight), total phenolic content (102.71 mg of chlorogenic acid equivalent/100 g fresh weight) and total intact glucosinolates (195.22 &micro;mol of sinigrin equivalent/100 g fresh weight). Thus, cv. Dama exhibited higher values of in vitro antioxidant activity. &nbsp;

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