Estimation of antiradical properties of series of 4, 7 - dihydroxycoumarin derivatives towards DPPH radical-experimental and DFT study

Author(s):  
Ziko Milanovic ◽  
Edina Avdovic ◽  
Dusica Simijonovic ◽  
Zoran Markovic
2015 ◽  
Vol 166 ◽  
pp. 324-329 ◽  
Author(s):  
Ioana Vasilescu ◽  
Sandra A.V. Eremia ◽  
Camelia Albu ◽  
Antonio Radoi ◽  
Simona-Carmen Litescu ◽  
...  

2011 ◽  
Vol 23 (No. 2) ◽  
pp. 64-68 ◽  
Author(s):  
M. Karamać ◽  
A. Buciński ◽  
B. Pegg R ◽  
R. Amarowicz

Antioxidant and antiradical activities of ferulates (i.e., ferulic acid, isoferulic acid, coniferyl aldehyde, and methyl ferulate) were investigated using a &beta;-carotene-linoleate model system and a DPPH radical scavenging assay, respectively. Compounds so tested exhibited antioxidant and antiradical properties to varying degrees. Methyl ferulate showed the strongest antioxidant activity, whereas the parent phenolic acid was the most active ferulate to scavenge the DPPH radical (DPPH<sup>&middot;</sup>). Isoferulic acid at concentrations ranging from 10 to 100 nmol/assay did not impart an antiradical efficacy; this may be attributed to the location of the hydroxyl group in the meta position on the aromatic ring. &nbsp;


2008 ◽  
Vol 3 (11) ◽  
pp. 1934578X0800301 ◽  
Author(s):  
Dejan Stojković ◽  
Jasmina Glamočlija ◽  
Marina Soković ◽  
Dragoljub Grubišić ◽  
Silvana Petrović ◽  
...  

The chemical composition and antimicrobial and antiradical activities of the essential oils isolated from unripe and ripe fruits of S. globiferum Vis. (Apiaceae) have been determined. The most abundant constituent in the essential oils of unripe and ripe fruits was sabinene (53.1% and 65.3%), followed by γ-terpinene (7.7% and 6.6%), α-pinene (7.2% and 4.4%), and β-phellandrene (5.0% and 4.9%). Antibacterial and antifungal properties of these oils were evaluated using a modified microdilution technique. Scavenging activity was determined by the DPPH radical assay. The essential oils exhibited significant antimicrobial, but low antiradical activity.


2018 ◽  
Vol 44 (4) ◽  
pp. 515-520
Author(s):  
M Kazemi

Carum copticum L. comprises several relevant species for food, cosmetic, perfumery and pharmaceutical industries. GC/MS analysis of the enential oil of C. copticum revealed γ- terpinene as a major component of C. copticum, with its contribution of 33.85%. Essential oils (EOs) exhibited a significant antimicrobial activity against all tested microbial strains. In addition, the C. copticum oil demonstrated the highest DPPH radical scavenging activity. These results clearly show the antimicrobial and antioxidant effects of the plant essential oil.


2009 ◽  
Author(s):  
Manuel Fernández-Gómez ◽  
Amparo Navarro ◽  
MªPaz Fernández-Liencres ◽  
Mónica Moral ◽  
José Manuel Granadino-Roldán ◽  
...  

Author(s):  
Yasemin Karafakıoglu

Taxus species in different parts of the world prevent the formation of hepatoprotective, anticoagulant, antiulcerogenic, anti-coagulant, antifungal and tumour cells. In this study, biological activity studies were performed on the leaves, branches and fruits of the methanol extract of Taxus baccata L. species collected from Sivaslı district of Uşak province. The methanol extract of the T.baccata species, the total amount of phenolic content of the sample was found to be 14.76 mg GAEQ/1g dry sample in the highest leaves. In T.baccata methanol extract, the maximum amount of flavonoid content was 0.468±mg QE/g dry sample. Antioxidant activity value as DPPH radical; % inhibition value was found as 93.21%. Based on the results; It can be concluded that the leaves of T.baccata have higher antioxidant activity than fruits and branches. Future studies need to explore the chemical components contained in the T.baccata species to determine and investigate in further detail.


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