An integrated antioxidant activity fingerprint for commercial teas based on their capacities to scavenge reactive oxygen species

2017 ◽  
Vol 237 ◽  
pp. 645-653 ◽  
Author(s):  
Yu-Jie Guo ◽  
Li-Qiong Sun ◽  
Bo-Yang Yu ◽  
Jin Qi
Antioxidants ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 388
Author(s):  
Xiao Dan Hui ◽  
Gang Wu ◽  
Duo Han ◽  
Xi Gong ◽  
Xi Yang Wu ◽  
...  

In this study, blueberry and blackcurrant powder were chosen as the phenolic-rich enrichments for oat bran. A Rapid Visco Analyser was used to form blueberry and blackcurrant enriched oat pastes. An in vitro digestion process evaluated the changes of phenolic compounds and the in vitro antioxidant potential of extracts of pastes. The anthocyanidin profiles in the extracts were characterised by the pH differential method. The results showed that blueberry and blackcurrant powder significantly increased the content of phenolic compounds and the in vitro antioxidant capacity of pastes, while the total flavonoid content decreased after digestion compared to the undigested samples. Strong correlations between these bioactive compounds and antioxidant values were observed. Lipopolysaccharide-stimulated RAW264.7 macrophages were used to investigate the intracellular antioxidant activity of the extracts from the digested oat bran paste with 25% enrichment of blueberry or blackcurrant powder. The results indicated that the extracts of digested pastes prevented the macrophages from experiencing lipopolysaccharide (LPS)-stimulated intracellular reactive oxygen species accumulation, mainly by the Kelch-like ECH-associated protein 1 (Keap1)/nuclear factor erythroid 2-related factor 2 (Nrf2) signalling pathway. These findings suggest that the bioactive ingredients from blueberry and blackcurrant powder enhanced the in vitro and intracellular antioxidant capacity of oat bran pastes, and these enriched pastes have the potential to be utilised in the development of the functional foods.


2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Chong Zhao ◽  
Takenori Sakaguchi ◽  
Kosuke Fujita ◽  
Hideyuki Ito ◽  
Norihisa Nishida ◽  
...  

Pomegranate-derived polyphenols are expected to prevent life-style related diseases. In this study, we evaluated the ability of 8 pomegranate-derived polyphenols, along with other polyphenols, to augment SIRT3, a mammalian SIR2 homolog localized in mitochondria. We established a system for screening foods/food ingredients that augment the SIRT3 promoter in Caco-2 cells and identified 3 SIRT3-augmenting pomegranate-derived polyphenols (eucalbanin B, pomegraniin A, and eucarpanin T1). Among them, pomegraniin A activated superoxide dismutase 2 (SOD2) through SIRT3-mediated deacetylation, thereby reducing intracellular reactive oxygen species. The other SIRT3-augmenting polyphenols tested also activated SOD2, suggesting antioxidant activity. Our findings clarify the underlying mechanisms involved in the antioxidant activity of pomegraniin A.


Author(s):  
Ekaterina Kovel ◽  
Anna Sachkova ◽  
Natalia Vnukova ◽  
Grigoriy Churilov ◽  
Elena Knyazeva ◽  
...  

Fullerenols are nanosized water-soluble polyhydroxylated derivatives of fullerenes, specific allotropic form of carbon, bioactive compounds and perspective pharmaceutical agents. We studied biological effects of a series of fullerenols. Antioxidant activity and toxicity of the fullerenols were compared using bioluminescence assays (cellular and enzymatic); a content of Reactive Oxygen Species in fullerenol solutions was determined using chemiluminescence luminol method. Two groups of fullerenols with different number of hydroxyl substituents were under investigation: (I) С60Оy(OH)x, С60,70Оy(OH)x, where х+у=24–28 and (II) С60,70Оy(OH)x, Fe0,5С60Оy(OH)x, where х+у=40–42. Toxicity of the fullerenols was evaluated using effective concentrations ЕС50. Fullerenol’ antioxidant activity was investigated in model solutions of organic toxicant of oxidative type, 1,4-benzoquinone. Detoxification coefficients were calculated to analyze and compare the antioxidant activity. Higher toxicity and lower antioxidant activity were demonstrated in the solutions of fullerenols with higher number of the oxygen substituents (х+у=40–42). The differences were concerned with fullerenol’ ability to disturb Reactive Oxygen Species balance in aqueous solutions. Toxic effect of the prospective endohedral metal-fullerenol with gadolinium atom involved, Gd@C82Oy(OH)x, where х+у=40–42, was evaluated and explained by a high number of oxygen groups


Author(s):  
Sowjanya Pulipati ◽  
P. Srinivasa Babu ◽  
U. Naveena ◽  
S.K. Rafeeka Parveen ◽  
S.K. Sumaya Nausheen ◽  
...  

Free radicals or reactive oxygen species are involved in various pharmacological conditions. As synthetic antioxidants possess numerous adverse health effects, the medicinal plants possessing antioxidant components can be used to prevent harmful effects of reactive oxygen species. In the present study leaves of Amaranthus tricolor Linn were used to prepare chloroform (CEAT), methanolic (MEAT) and aqueous (AEAT) extracts, analyze the presence of phytochemicals and evaluation of in-vitro antioxidant property. Quantitative determination of phenols, tannins and flavonoids in leaves A.tricolor was carried out using spectrophotometric methods. The antioxidant activity was performed by DPPH, p-NDA radical scavenging methods for different extracts of the plant. The plant species showed that methanolic extract (MEAT) on higher concentration possess better antioxidant potential when compared with reference standard ascorbic acid. The plant extracts exhibited strong antioxidant DPPH radical scavenging activity with the IC50 values 290, 657, 830 and 130μg/ml of MEAT, CEAT, AEAT and ASA respectively. In scavenging hydroxyl radical by p-NDA method the MEAT showed maximum activity, CEAT showed moderate and AEAT showed minimum activity. The strongest antioxidant activity of MEAT could be due to the presence of flavonoids and phenols.


2022 ◽  
Author(s):  
Tahseen Abdul qader Alsalim ◽  
Noor M. Nasir ◽  
Amr Ahmed El-Arabey ◽  
Mohnad Abdalla

Abstract Liver cancer accounts for a major portion of the global cancer burden. In many nations, the prevalence of this condition has risen in recent decades. New series of thaiazolidinones and thaiadiazolidine have been designed, synthesized, and evaluated for potential antioxidant and antihepatocarcinogenic activity. The antioxidant activity of synthesized compounds was evaluated using a DPPH assay. Furthermore, we examined the compounds against HepG2 cells using MTT assay, flow cytometry analysis through the cell cycle, reactive oxygen species, and apoptosis. The result showed that compound 6b has the highest antioxidant activity with IC50 =60.614±0.739 µM. The anticancer activity showed that compounds 5 and 6b have significant toxicity against liver cancer cells HepG2, IC50 values (9.082 and 4.712) µM, respectively. Flow cytometry experiments revealed that compound 5 arrested HepG2 cells in the S process, while compound 6b arrested HepG2 cells in the G1. Compound 6b had a greater reduction in reactive oxygen species and late apoptosis than compound 5. Substantially, compound 5 had affinity energies of -7.6 and -8.5 for Akt and CDK4 proteins, respectively, but compound 6b had affinity energies of -7.8 and -10.1 for Akt1 and CDK4 proteins, respectively. Consequently, compound 6b had lower binding energies than compound 5. In this work, we used multiple bioinformatics methods to shed light on the prospective therapeutic use of these series as novel candidates to target immune cells in the tumor microenvironment of hepatocellular carcinomas such as CD8+ T cells, endothelial cells, and hematopoietic stem cells. The results of antioxidant, anticancer, molecular docking studies, and bioinformatic analysis showed that compound 6b has a potential impact and could be developed for drug discovery with further research.


2015 ◽  
Vol 43 (2) ◽  
pp. 293-301 ◽  
Author(s):  
Diana CENARIU ◽  
Eva FISCHER-FODOR ◽  
Piroska VIRAG ◽  
Corina TATOMIR ◽  
Mihai CENARIU ◽  
...  

The aim of this research was to establish whether all-trans lycopene extracted from fresh and frozen tomatoes is able to inhibit the in vitro proliferation of colon cancer cells, to trigger apoptosis by reactive oxygen species modulation and to reveal its influence on NF-kβ signalling, through the p65 transcription factor and expression of two TNF receptors: GITR and CD27. The carotenoid extracts containing all-trans lycopene were obtained from fresh (E1) and frozen/thawed (E2) tomatoes (Lycopersicon esculentum Mill.), hybrid ‘Menhir’ F1. DLD-1 and HT-29 human colon adenocarcinoma cell lines were co-cultivated with the two extracts and cytotoxicity, apoptosis, antioxidant activity, reactive oxygen species as well as modulation of NF-kβ signalling pathway were assessed. Tomato extracts E1 and E2 were able to inhibit colon cancer cell growth in vitro. E2 contained a higher proportion of all-trans lycopene and displayed superior cytotoxicity and a better apoptosis inducing capacity. The two extracts proved antioxidant activity against DPPH radicals and were able to scavenge the reactive oxygen species in the treated tumour cells. This study also showed that lycopene acts mainly through p65 protein and moderately by TNF receptors GITR and CD27 to deactivate the NF-kβ signalling pathway involved in cancer cell proliferation.


RSC Advances ◽  
2018 ◽  
Vol 8 (29) ◽  
pp. 16126-16138
Author(s):  
Weiheng Wang ◽  
Xiaodong Huang ◽  
Yongxing Zhang ◽  
Guoying Deng ◽  
Xijian Liu ◽  
...  

Selenium (Se) is an essential trace element with strong antioxidant activity, showing a great prospect in the treatment of spinal cord injury (SCI).


2017 ◽  
Vol 10 (2) ◽  
pp. 61-65 ◽  
Author(s):  
Rami B. Kassab ◽  
Ondrej Vasicek ◽  
Milan Ciz ◽  
Antonin Lojek ◽  
Tomas Perecko

AbstractThe health benefits of berberine have been recognized for years. Even so, its effects on human neutrophils, the first line of immune defense, have not been reported. The purpose of this study was to investigate the effects of berberine on the human neutrophil oxidative burst. Reactive oxygen species production was analyzed by luminol-enhanced chemiluminescence. The analysis was performed in spontaneous and stimulated (phorbol myristate acetate (PMA) or opsonized zymosan particles (OZP)) whole blood and isolated neutrophils in the presence or absence of berberine. The effects of berberine on oxidant production in cell-free assays were evaluated using luminescence (H2O2-peroxidase-luminol) and fluorescence (Oxygen Radical Absorbance Capacity – ORAC) techniques. Berberine decreased the production of reactive oxygen species in human whole blood and isolated neutrophils stimulated with either PMA or OZP with a different efficiency (EC50was 69 μM and 197 μM for PMA and OZP, respectively). The effect was more pronounced in isolated neutrophils. Cell-free assays showed the antioxidant activity of berberine against peroxyl radicals and hydrogen peroxide. Based on our results, we suggest that the effects of berberine on reactive oxygen species production in human neutrophils are due to its antioxidant activity.


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