The influence of nitrogen and potassium fertilisation on the content of polyphenolic compounds and antioxidant capacity of coloured potato

2016 ◽  
Vol 47 ◽  
pp. 69-75 ◽  
Author(s):  
Anna Michalska ◽  
Aneta Wojdyło ◽  
Bożena Bogucka
Keyword(s):  
Antioxidant Capacity ◽  
Polyphenolic Compounds

HPLC Screening of Bioactives Compounds and Antioxidant Capacity of Different Hypericum Species

2018 ◽  
Vol 69 (2) ◽  
pp. 305-309 ◽  
Author(s):  
Daniela Gitea ◽  
Simona Vicas ◽  
Manuel Alexandru Gitea ◽  
Sebastian Nemeth ◽  
Delia Mirela Tit ◽  
...  
Keyword(s):  
Antioxidant Capacity ◽  
Methanol Extract ◽  
Antioxidant Properties ◽  
Polyphenolic Compounds ◽  
The Other ◽  
The North ◽  
Western Area ◽  
North Western ◽  
Hypericum Species ◽  
Biological Actions

Our study compares the content in polyphenolic compounds and hypericin, in four species of Hypericum - H. perforatum L., H. maculatum Cr., H. hirsutum L., H. tetrapterum Fr. (syn. Hypericumacutum Mnch.) harvested from spontaneous flora in the north-western area of Transylvania, Romania. These species represent an important source of such compounds with different biological actions. After making the extracts, they were subjected to HPLC-SM analysis. The presence of rutoside in the largest amount (462.82 mg %) in the H. perforatum extract was observed, this containing most of the flavonoid heterosides. For the species H. maculatum, the presence in a much higher amount of the hyperoside (976.36 mg %) is characteristic compared to the other species. Quercetol is the best represented of the flavonoid aglycons, its concentration being the highest in H. hirsutum (659.66 mg %). The hypericin content ranges from 0.2171 g % in the H. tetrapterum extract, to 0.0314 g % in the methanol extract of H. maculatum.The highest antioxidant properties measured by FRAP method were recorded in the case of H. perforatum and H. maculatum.

scholarly journals Antioxidants from Tropical Herbs

2010 ◽  
Vol 5 (3) ◽  
pp. 1934578X1000500 ◽  
Author(s):  
Rasyidah Razab ◽  
Azlina Abdul Aziz
Keyword(s):  
Free Radicals ◽  
Antioxidant Capacity ◽  
Strong Correlation ◽  
Antioxidant Activities ◽  
Polyphenolic Compounds ◽  
Trolox Equivalent Antioxidant Capacity ◽  
Antioxidant Power ◽  
Polyphenolic Content ◽  
Trolox Equivalent ◽  
Ferric Reducing Antioxidant Power

Plants that contain high amounts of polyphenolic compounds are potential candidates for natural antioxidant sources. Studies are on going in the search for new sources of antioxidants. Not much data are available on the antioxidant capacity of tropical herbs. With this in mind, 19 commonly consumed Malaysian herbs were analyzed for their polyphenolic content and antioxidant activities. A majority of these plants have never been studied before with regards to their polyphenolic content and antioxidant activities. The shoots of Anacardium occidentale, the shoots and fruits of Barringtonia racemosa, Pithecellobium jiringa and Parkia speciosa had high polyphenolic contents (> 150 μg gallic acid equivalents/mg dried plant) and antioxidant activities when measured using the ferric reducing antioxidant power (FRAP) (>1.2 mM) and Trolox equivalent antioxidant capacity (TEAC) assays (>2.4 mM). A strong correlation was observed between the two antioxidant assays (FRAP vs TEAC) implying that the plants could both scavenge free radicals and reduce oxidants. There was also a strong correlation between the antioxidant activities and polyphenolic content suggesting the observed antioxidant activities were contributed mainly by the polyphenolics in the plants.

Purification, structural elucidation, antioxidant capacity and neuroprotective potential of the main polyphenolic compounds contained in Achyrocline satureioides (Lam) D.C. (Compositae)

2019 ◽  
Vol 27 (12) ◽  
pp. 2579-2591
Author(s):  
Marcela Martínez-Busi ◽  
Florencia Arredondo ◽  
David González ◽  
Carolina Echeverry ◽  
Mauricio A. Vega-Teijido ◽  
...  
Keyword(s):  
Antioxidant Capacity ◽  
Polyphenolic Compounds ◽  
Structural Elucidation ◽  
Achyrocline Satureioides

scholarly journals Research on an antioxidant capacity of honeys

2012 ◽  
Vol 59 (1) ◽  
pp. 265-269 ◽  
Author(s):  
Elżbieta Hołderna-Kędzia ◽  
Bogdan Kędzia
Keyword(s):  
Ascorbic Acid ◽  
Natural Products ◽  
Free Radicals ◽  
Antioxidant Capacity ◽  
Antioxidative Activity ◽  
Polyphenolic Compounds ◽  
Human Organism ◽  
Oxidation Activity ◽  
Harmful Action ◽  
Antioxidative Agents

Human organism is exposed to harmful action of free radicals which are produced as well endogenically as egzogenically. The oxidation activity of free radicals can lead to the conversion of systemic biomolecules. As a consequence, there is a threat of, many severe diseases. Antioxidative agents which occur in natural products (also in honey) raise a possibility of protection against the harmful action of above mentioned radicals. Polyphenolic compounds - flavonoids, phenolic acids and ascorbic acid - are the most important antioxidative agents. The research of many authors proves that honey, given orally, shows an antioxidative activity. The level of antioxidative agents in serum after the consumption of honey is high and surpasses the antioxidative activity of tea. Dark honeys (honeydew and heather) have considerably higher antioxidative activity in comparison to light ones (acacia, lime, polyfloral).

Chemical composition and potential bioactivity of strawberry pomace

RSC Advances ◽  
2015 ◽  
Vol 5 (7) ◽  
pp. 5397-5405 ◽  
Author(s):  
Vesna Tumbas Šaponjac ◽  
Amadeo Gironés-Vilaplana ◽  
Sonja Djilas ◽  
Pedro Mena ◽  
Gordana Ćetković ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Antioxidant Capacity ◽  
Reducing Power ◽  
Polyphenolic Compounds

Strawberry pomace constitutes a promissing source of polyphenolic compounds and possesses notable antioxidant capacity, reducing power and α-glucosidase inhibition potential.

scholarly journals Determination of Antioxidant Capacity, Flavonoids, and Total Phenolic Content in Eucalyptus and Clover Honeys

2014 ◽  
Vol 58 (1) ◽  
pp. 103-111 ◽  
Author(s):  
María C. Ciappini ◽  
Fernando S. Stoppani
Keyword(s):  
Antioxidant Capacity ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Antioxidant Activities ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Polyphenolic Compounds ◽  
Trolox Equivalent Antioxidant Capacity ◽  
Total Phenolic

Abstract Polyphenolic compounds reportedly produce physiological effects that are beneficial to health. Bee products are particularly rich in polyphenolic compounds. We determined the antioxidant capacity and the phenolic and flavonoid compounds content of 81 samples of honey. We used the Folin-Ciocalteu reagent method to evaluate the total phenolic content. The antioxidant activities were evaluated using in vitro scavenging assays of 2,2-diphenyl-1-picrylhydrazyl (DPPH ) and hydroxyl radicals (OH ), Trolox equivalent antioxidant capacity (TEAC ), and ferric-reducing antioxidant capacity (FRAC ). Total phenolic content ranged from 40.3 to 193.0 mg gallic acid equivalents (GAE )/100 g; the flavonoid content varied from 1.4 to 7.5 mg quercetin equivalents (QE)/100 g. Eucalyptus honeys exhibited significantly higher phenolic content and free radical-scavenging activity than clover honey samples (p<0.05 for all). Principal component analysis explained 73% of the differences observed in antiradical activity with respect to floral origin. Total phenolic content may be more useful than the radical-scavenging assay for detecting antioxidant capacity in honey; it also represents the variable that most appropriately discriminated among these honeys.

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