scholarly journals Relationship between Antioxidant Activity and Ligand Basicity in the Dipicolinate Series of Oxovanadium(IV) and Dioxovanadium(V) Complexes

2021 ◽  
Vol 22 (18) ◽  
pp. 9886
Author(s):  
Joanna Drzeżdżon ◽  
Marta Pawlak ◽  
Natalia Matyka ◽  
Artur Sikorski ◽  
Barbara Gawdzik ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Superoxide Anion ◽  
Antioxidant Activities ◽  
Transition Metal Ions ◽  
Protonated Form ◽  
High Reactivity ◽  
Complex Compounds ◽  
The Body ◽  
Balanced Diet ◽  
Artery Disease

Oxidative stress plays an important role in the pathogenesis of many serious diseases, including cancer, atherosclerosis, coronary artery disease, Parkinson’s disease, Alzheimer’s disease, stroke and myocardial infarction. In the body’s natural biochemical processes, harmful free radicals are formed, which can be removed with the help of appropriate enzymes, a balanced diet or the supply of synthetic antioxidant substances such as flavonoids, vitamins or anthocyanins to the body. Due to the growing demand for antioxidant substances, new complex compounds of transition metal ions with potential antioxidant activity are constantly being sought. In this study, four oxovanadium(IV) and dioxovanadium(V) dipicolinate (dipic) complexes with 1,10-phenanthroline (phen), 2,2′-bipyridyl (bipy) and the protonated form of 2-phenylpyridine (2-phephyH): (1) [VO(dipic)(H2O)2] · 2 H2O, (2) [VO(dipic)(phen)] · 3 H2O, (3) [VO(dipic)(bipy)] · H2O and (4) [VOO(dipic)](2-phepyH) · H2O were synthesized including one new complex, so far unknown and not described in the literature, i.e., [VOO(dipic)](2-phepyH) · H2O. The oxovanadium(IV) dipicolinate complexes with 1,10-phenanthroline and 2,2′-bipyridyl have been characterized by several physicochemical methods: NMR, MALDI-TOF-MS, IR, but new complex [VOO(dipic)](2-phepyH) · H2O has been examined by XRD to confirm its structure. The antioxidant activities of four complexes have been examined by the nitrotetrazolium blue (NBT) method towards superoxide anion. All complexes exhibit high reactivity with superoxide anion and [VOO(dipic)](2-phepyH) · H2O has higher antioxidant activity than L-ascorbic acid. Our studies confirmed that high basicity of the auxiliary ligand increases the reactivity of the complex with the superoxide radical.

Studies on Antioxidant Activities of Breviscapine in the Cell-Free System

2008 ◽  
Vol 36 (06) ◽  
pp. 1199-1207 ◽  
Author(s):  
Min Wang ◽  
Chen Xie ◽  
Run-Lan Cai ◽  
Xiao-Hong Li ◽  
Xiu-Zhen Luo ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Antioxidant Activity ◽  
Superoxide Anion ◽  
Therapeutic Potential ◽  
Antioxidant Activities ◽  
Chinese Herb ◽  
Radical Scavenging ◽  
Free System ◽  
Nitric Oxide Radical ◽  
Ischemic Diseases

Breviscapine is a commercially produced plant extract from the Chinese herb Erigeron breviscapus. (Vant.) Hand.-Mazz., which contains 2 main flavonoids. It is widely used in clinic to treat ischemic diseases in which free radicals are considered to be the main causal factor. Our study is aimed to examine the antioxidant activity of this extract. The following assays were employed: 1, 1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging, superoxide anion radical scavenging, nitric oxide radical scavenging, total anti-oxidative capacity, and antilipid peroxidation assays. Breviscapine was demonstrated to show an effective activity on scavenging DPPH, superoxide anion radicals and nitric oxide. The total antioxidative capacity of breviscapine (7.8 μg/ml to 250 μg/ml) was 1.22 to 6.74 FRAP value (× 10-5mmol). At the highest concentration of breviscapine, the inhibition extent of lipid peroxidation induced by Fe2+in rat liver homogenates was 38.5%. Because of the antioxidant activity, the present study is therefore designed to investigate the therapeutic potential of breviscapine for treatment of ischemic diseases.

scholarly journals Antioxidant Activity and Mechanism of Protocatechuic Acid in vitro

2011 ◽  
Vol 1 (7) ◽  
pp. 232 ◽  
Author(s):  
Xican Li ◽  
Xiaozhen Wang ◽  
Dongfeng Chen ◽  
Shuzhi Chen
Keyword(s):  
Antioxidant Activity ◽  
Hydroxyl Radical ◽  
Superoxide Anion ◽  
Protocatechuic Acid ◽  
Antioxidant Activities ◽  
Radical Scavenging ◽  
Reducing Power ◽  
Chelating Ability ◽  
Positive Controls

Background: Protocatechuic acid (PCA) is a natural phenolic acid widely distributed in plants and is considered as an active component of some traditional Chinese herbal medicines such as Cibotium barometz (L.) J.Sm, Stenoloma chusanum (L.) Ching, Ilex chinensis Sims. PCA was reported to possess various pharmacological effects which may be closely correlated with its antioxidant activities. However, the antioxidant of PCA has not been investigated systematically yet. Methods: In the study, the antioxidant activities of protocatechuic acid were measured in vitro using various antioxidant assays including 1,1-diphenyl-2-picryl-hydrazyl (DPPH•), 2,2’-azino-bis (3-ethylbenzthiazoline-6-sulfonic acid) (ABTS+•), superoxide anion radicals (•O2-) and hydroxyl radical (•OH) scavenging activity, ferric ions (Fe3+) and cupric ions (Cu2+) reducing power, ferrous ions (Fe2+) and cupric ions (Cu2+) chelating activity, compared with the positive controls Trolox or BHT.Results: In all assays, PCA along with positive controls exhibited dose-dependently antioxidant ability. Comparing to a standard antioxidant Trolox, the relative antioxidant activity of PCA (i.e. the ratio of IC50(Trolox)/IC50(PCA) ) was calculated as 2.8, 2.3, 3.7, 6.1, 4.2, 1.0, 2.7, 1.5, respectively, for DPPH, ABTS, reducing power (Fe3+), reducing power (Cu2+), superoxide anion radical-scavenging, hydroxyl radical-scavenging, chelating ability (Fe2+) and chelating ability (Cu2+). Conclusion: Comparing to Trolox, PCA shows much more effective antioxidant activity in vitro in both lipid and aqueous media. Hence, it could therefore be used in pharmacological or food industry as a natural antioxidant. It may exhibit antioxidant activity by both chelating metal transition ions as well as by scavenging free radicals via donating hydrogen atom (H•) or electron (e).Keywords: Protocatechuic acid, antioxidant, reducing power, free radical-scavenging, chelating ability.

scholarly journals Enhancement of the Antioxidant and Skin Permeation Properties of Betulin and Its Derivatives

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3435
Author(s):  
Andrzej Günther ◽  
Edyta Makuch ◽  
Anna Nowak ◽  
Wiktoria Duchnik ◽  
Łukasz Kucharski ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Plant Material ◽  
Antioxidant Activities ◽  
Skin Permeation ◽  
The Body ◽  
Skin Permeability ◽  
Polycyclic Compounds ◽  
Pig Skin ◽  
Pure Compounds ◽  
Permeation Properties

This study investigated the antioxidant activity DPPH, ABTS, and Folin–Ciocalteu methods of betulin (compound 1) and its derivatives (compounds 2–11). Skin permeability and accumulation associated with compounds 1 and 8 were also examined. Identification of the obtained products (compound 2–11) and betulin isolated from plant material was based on the analysis of 1H- NMR and 13C-NMR spectra. The partition coefficient was calculated to determine the lipophilicity of all compounds. In the next stage, the penetration through pig skin and its accumulation in the skin were evaluated of ethanol vehicles containing compound 8 (at a concentration of 0.226 mmol/dm3), which was characterized by the highest antioxidant activity. For comparison, penetration studies of betulin itself were also carried out. Poor solubility and the bioavailability of pure compounds are major constraints in combination therapy. However, we observed that the ethanol vehicle was an enhancer of skin permeation for both the initial betulin and compound 8. The betulin 8 derivative showed increased permeability through biological membranes compared to the parent betulin. The paper presents the transformation of polycyclic compounds to produce novel derivatives with marked antioxidant activities and as valuable intermediates for the pharmaceutical industry. Moreover, the compounds contained in the vehicles, due to their mechanism of action, can have a beneficial effect on the balance between oxidants and antioxidants in the body, minimizing the effects of oxidative stress. The results of this work may contribute to knowledge regarding vehicles with antioxidant potential. The use of vehicles for this type of research is therefore justified.

scholarly journals PENGARUH BERBAGAI PH SARI BUAH DAN SUHU PASTEURISASI TERHADAP AKTIVITAS ANTIOKSIDAN DAN TINGKAT PENERIMAAN SARI KULIT BUAH MANGGIS

2012 ◽  
Vol 1 (1) ◽  
pp. 209-215 ◽  
Author(s):  
Claudia Norma Gupita ◽  
Arintina Rahayuni
Keyword(s):  
Oxidative Stress ◽  
Antioxidant Activity ◽  
Antioxidant Activities ◽  
The Body ◽  
Wilcoxon Test ◽  
Acceptance Test ◽  
Friedman Test ◽  
Potential Activity ◽  
Stress Damage ◽  
Test Result

ABSTRACTBackground: Oxidative stress is associated with the progression of degenerative disease. The consumption of antioxidant resources to prevent the body from oxidative stress damage. Mangosteen fruit hull is one of the mangosteen waste which has potential activity of natural antioxidant, such as xanthone and anthocyanins. Xanthon and anthocyanins influenced by pH and heating. Therefore, it is necessary to study about the effect of pH and temperature pasteurized on antioxidant activity of the mangosteen fruit hull juice.Objective : Analyze the effect of antioxidant activity and the level of acceptance of the mangosteen fruit hull juice with various pH and pasteurization temperature. Methods : An experimental study with a factorial design which combines pH (pH 3 and pH 4) and pasteurization temperature (temperature of 750C, 850C, 950C). The analyzes are antioxidant activities and the level of acceptance. The antioxidant activity obtained with DPPH (2,2 dhipenyl -1-pycrilhidrazyil) test. The acceptance test are conducted with hedonic test. Statistical analysis of the antioxidant activity using Two Way ANOVA test CI 95%, while the level of acceptance using Friedman test followed Wilcoxon test. Result : The result of antioxidant activity of mangosteen fruit hull juice ranged 80.64-89.70%. The various pH and pasteurization temperature did not effect the antioxidant activity of the mangosteen fruit hull juice. The results of  test acceptance, color and taste are affected by variations in pH and temperature pasteurization, except aroma. The more acidic pH of juice, mangosteen fruit hull juice color of the panelists preferred. Acidification can not relieve harsh flavor mangosteen fruit hull juice. All mangosteen fruit hull juice aroma panelists preferred.Conclucion : The various pH and pasteurization temperature did not effect the antioxidant activity of the mangosteen fruit hull juice. The results of  test acceptance, color and taste are affected by variations in pH and temperature pasteurization, except aroma. Keyword : antioxidant activity, mangosteen fruit hull juice, pH, pasteurization temperature

scholarly journals Antibacterial and antioxidant activities of ethanol extract of Artocarpus lacucha Buch-Ham. leaves against Propionibacterium acne

2021 ◽  
Vol 332 ◽  
pp. 08007
Author(s):  
Panal Sitorus ◽  
Mahatir Muhammad ◽  
Henni Cintya ◽  
and Denni Satria
Keyword(s):  
Antioxidant Activity ◽  
Phenolic Content ◽  
Antioxidant Activities ◽  
Ethanol Extract ◽  
The Body ◽  
Total Flavonoid ◽  
Total Phenolic ◽  
Degenerative Diseases ◽  
Inhibitor Concentration ◽  
Propionibacterium Acne

Antioxidants can neutralize free radicals that can affect biological systems in the body that can cause degenerative diseases. Antibacterial active molecules have been identified from plants, and these chemicals are being utilized to develop new and promising treatments. The Mobe plant (Artocarpus lacucha Buch-Ham.) is a species of Artocarpus member of the Moraceae family. Includes a high proportion of phenolic compounds (flavonoids and phenolic acid). This research obtained to know about the biological activity of Artocarpus lacucha Buch-Ham and their total flavonoid and total phenolic content. The extract was prepared using the soxhletation technique using ethanol as the solvent. Antibacterial activity was determined using minimum inhibitor concentration. Propionibacterium acne can be inhibited at concentrations ranging from 300 ppm to 25 ppm. The DPPH technique was used to assess antioxidant activity. The samples’ total flavonoid and phenolic content were measured colorimetrically. The DPPH test revealed an antioxidant activity of 23.33 g/mL, which was used to compute the IC50. The extract’s total phenolic (117.44 mg GAE/g) and flavonoid (3.54 mg QE/g) content were determined to be high.

scholarly journals Synthesis, characterization and biological activity of new Ni(II), Pd(II) and Cr(III) complex compounds with chlorhexidine

2018 ◽  
Vol 83 (3) ◽  
pp. 271-284 ◽  
Author(s):  
Mădălina Mihalache ◽  
Ticuţa Negreanu-Pîrjol ◽  
Florea Dumitraşcu ◽  
Constantin Drăghici ◽  
Mirela Călinescu
Keyword(s):  
Antimicrobial Activity ◽  
Antioxidant Activity ◽  
Metal Complexes ◽  
Coordination Compounds ◽  
Antimicrobial Agents ◽  
Antioxidant Activities ◽  
Complex Compounds ◽  
Gram Negative Bacteria ◽  
Gram Negative

Six new coordination compounds of Ni(II), Pd(II) and Cr(III) with chlorhexidine, 1,1?-hexamethylenebis[5-(4-chlorophenyl)biguanide], were prepared, characterized and examined for their potential as antimicrobial agents, as well as for their antioxidant activity. The metal complexes correspond to the formulas: [Ni(CHX)]Cl2?2H2O, [Ni(CHX)]Br2?2H2O, [Ni(CHX)](CH3COO)2?C2H5OH, [Pd(CHX)][PdCl4]?2H2O, [Pd(CHX)](CH3COO)2 and [Cr(CHX)Cl2](CH3COO), where CHX = chlorhexidine. Investigations on the in vitro antimicrobial activity of the complexes indicated that all have high activity against the tested bacteria, but are less active against fungi. Among the six complexes, those of Pd(II) showed the highest antibacterial activity, [Pd(CHX)][PdCl4]?2H2O being more active against Gram-positive and Gram-negative bacteria than chlorhexidine diacetate. The antioxidant activity of the metal complexes was investigated by photochemiluminescence and the results showed that the palladium( II) complexes have high antioxidant activities.

Antioxidant Activities, Binding Parameters, and Electrochemical Behavior of Superoxide Anion Radicals Twords 1-Ferrocenylmethylthymine and 1-Ferrocenylmethylcytosine

2020 ◽  
Vol 10 (1) ◽  
pp. 10-22
Author(s):  
Elhafnaoui Lanez ◽  
Lazhar Bechki ◽  
Touhami Lanez
Keyword(s):  
Antioxidant Activity ◽  
Superoxide Anion ◽  
Anion Radical ◽  
Antioxidant Activities ◽  
Binding Free Energy ◽  
Order Rate Constant ◽  
Superoxide Anion Radical ◽  
Binding Parameters ◽  
Ferrocene Derivatives ◽  
Peak Current Density

Background: An electrochemical method based on cyclic voltametry techniques was used to measure the antioxidant activity of two ferrocene-nucleobases. Objective: The present study aims to measure the antioxidant activity of two ferrocene derivatives bearing nucleobases; the technique is based on the reaction of the in-situ electrochemical generated superoxide anion radical with ferrocene-nucleobases. Methods: The decrease in the anodic peak current density of the O2 / O2 .− redox couple following the addition of ferrocene-nucleobases was used to measure the antioxidant activity and binding parameters of 1-ferrocenylmethylthymine and 1-ferrocenylmethylcytosine with superoxide anion radical. Conclusion: Both 1-Ferrocenylmethylthymine and 1-Ferrocenylmethylcytosine showed higher antioxidant activity (0.34 ± 0.03 and 0.045 ± 0.02 mg/mL respectively) than that of standard antioxidant α-tocopherol (3.04 ± 0.03 mg/mL). The value of the binding free energy ranging from -16.1 kJ.mol-1 for 1-ferrocenylmethylthymine to -21.8 kJ.mol-1 for 1- ferrocenylmethylcytosine suggests an electrostatic interaction of superoxide anion radical with both compounds which has been found to be the dominant interaction mode. The kinetics of the interaction reaction of the compounds was quantified having second-order rate constant values equal to 4.0 and 16.5 M-1 s-1 respectively.

Determination of Polyphenols Content and Antioxidant Activity of Citrus sinensis Fruit Peel

2022 ◽  
Vol 11 (6) ◽  
pp. 716-724
Author(s):  
ABDELKADER BASLI ◽  
Ahmed Benmahammed
Keyword(s):  
Lipid Peroxidation ◽  
Antioxidant Activity ◽  
Citrus Sinensis ◽  
Antioxidant Activities ◽  
Northern Region ◽  
The Body ◽  
Antioxidant Potential ◽  
Total Phenolic ◽  
Fruit Peel ◽  
Therapeutic Benefits

Citrus fruits have long been qualified as veritable foods in view of the many therapeutic benefits they bring to the body. Several researchers have stud-ied the relationship between the bioactive compounds of Citrus and the health benefits and reduction of the risk of disease. Citrus sinensis, used in the food industry and its extracts have also been used in traditional medicine to activate vital energy, circulation, and weight loss, and appetite control. However, limited efforts have been made on collecting data on antioxidant potential of peels orange from the northern region of Algeria. Our study, therefore, focuses on the evaluation of total polyphenols compounds and in vitro assessment of their antioxidant potential of peels orange from the northern region of Algeria. The ethyl acetate and n-butanolic fractions from peels orange have been tested for their antioxidant activities and their lipid peroxidation inhibiting effects. The total phenolic and flavonoids content showed high levels. The preliminary phytochemical screening of tannins, phenolic compounds, flavonoids, coumarin, and alkaloids was also used. DPPH assay possesses strong potency to scavenge free radicals. The NO. radi-cal scavenging test exerts a good inhibitory effect. Furthermore, orange peels have been shown to suppress the lipid peroxidation of linoleic acid. Results further revealed a strong correlation between antioxidant effects and polyphenolic compounds. The high antioxidant activity of peel orange suggests that it could serve as a good natural antioxidant additive or food dietary supplement.

scholarly journals ANTIOXIDANT ACTIVITY OF ALKALOID FRACTIONS OF ZANTHOXYLUM ACANTHOPODIUM DC. FRUITS WITH 1,1-DIPHENYL-2-PICRYLHYDRAZYL ASSAY

2018 ◽  
Vol 11 (13) ◽  
pp. 33
Author(s):  
Rosidah Rosidah ◽  
Poppy Anjelisa Zaitun Hasibuan ◽  
Ginda Haro ◽  
Puteri Masri ◽  
Denny Satria
Keyword(s):  
Oxidative Stress ◽  
Antioxidant Activity ◽  
Free Radical ◽  
Antioxidant Activities ◽  
Ethanol Extract ◽  
Liquid Extraction ◽  
The Body ◽  
Antioxidant Potential ◽  
Liquid Liquid Extraction

 Objective: Antioxidants are vital substances which possess the ability to protect the body from damage caused by free radical-induced oxidative stress. The purpose of this study is to determine antioxidant activities of alkaloid fractions of Zanthoxylum acanthopodium DC. fruits.Methods: Z. acanthopodium DC. fruit was extracted by maceration. Ethanol extract was fractionated with liquid-liquid extraction using n-hexane and chloroform at pH 3, 7, 9, and 11 to obtained alkaloid fractions. Antioxidant activity for extract and fractions was determined with 1,1-diphenyl-2- picrylhydrazyl.Results: The IC50 of extract and fractions was 101.11±0.11, 273.24±0.12, 116.62±0.04, 61.12±0.01, 23.15±0.01, and 112.39±0.04 μg/mL, respectively.Conclusion: The results reveal that alkaloid fractions of Z. acanthopodium DC. fruit have very strong antioxidant potential. Our further study is to isolate the alkaloid compounds.

Characterization and Antioxidant Activities of Polysaccharides from Fructus corni

2012 ◽  
Vol 560-561 ◽  
pp. 231-236 ◽  
Author(s):  
Ping Li ◽  
Zong Gang Mou ◽  
Geng Xiu Zheng ◽  
Run Yu Ma
Keyword(s):  
Antioxidant Activity ◽  
Free Radicals ◽  
Superoxide Anion ◽  
Main Chain ◽  
Antioxidant Activities ◽  
Molar Ratio ◽  
Molecular Weights ◽  
Branching Points ◽  
Pharmaceutical Industries ◽  
Hydroxyl Free Radicals

The composition and antioxidant activities of two polysaccharides PFCAⅢ and PFCCⅠ, isolated from Fructus corni, have been investigated. The monosaccharide components of PFCAⅢ were found to be rhamnose, arabinose and glucose in a molar ratio of 13.74: 50.54: 35.72, whilst PFCCⅠ was found to consist of xylose and glucose in a molar ratio of 18.8: 81.2. The weight-average molecular weights of PFCAⅢ and PFCCⅠwere 1.74×104 and 7.57×104 respectively. The polysaccharides showed potential antioxidant activity by scavenging superoxide anion (O2−∙) and hydroxyl free radicals (OH∙) and this was confirmed by their ability to inhibit oxidation of axunge and gingili. The concentrations required to scavenge 50% of hydroxyl free radicals (EC50) of PFCAⅢ and PFCCⅠ were 430μg/ml and 80μg/ml respectively, and the extents of scavenging O2−∙ by 500μg PFCAⅢ and PFCCⅠwere 15.9% and 68.0% respectively. The polysaccharide PFCCⅠ shows much more significant antioxidant activity than PFCAⅢ. PFCCⅠ was mainly linked with β(1→4)-D-glucosyl with side chains including 1-linked β-D-Glc, 1,6-linked β-D-Glc and 1,4-linked β-D-Xyl with branching points at C-6 of 1,4-linked Glc in main chain. It had the potential to be exploited by the food and pharmaceutical industries in the future with further research on this polysaccharide.

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