scholarly journals Investigating the Role of Antioxidant Compounds in Riboflavin-Mediated Photo-Oxidation of Methionine: A 1H-NMR Approach

ACS Omega ◽  
2020 ◽  
Vol 5 (40) ◽  
pp. 26220-26229 ◽  
Author(s):  
Daniela Fracassetti ◽  
Antonio Tirelli ◽  
Sara Limbo ◽  
Melissa Mastro ◽  
Luisa Pellegrino ◽  
...  
Keyword(s):  
1H Nmr ◽  
Antioxidant Compounds ◽  
Photo Oxidation ◽  
Oxidation Of Methionine

Study of antioxidant potential in leaves, stems, nuts of Juglans regia L.

2012 ◽  
Vol 1 (10) ◽  
pp. 79 ◽  
Author(s):  
G. Raja* ◽  
Ivvala Anand Shaker ◽  
Inampudi Sailaja ◽  
R. Swaminathan ◽  
S. Saleem Basha ◽  
...  
Keyword(s):  
Free Radicals ◽  
Free Radical ◽  
Antioxidant Activities ◽  
Radical Scavenging Activity ◽  
Juglans Regia ◽  
Radical Scavenging ◽  
Antioxidant Compounds ◽  
Free Radical Damage ◽  
Radical Damage

Natural antioxidants can protect the human body from free radicals and retard the progress of many chronic diseases as well as lipid oxidative rancidity in foods. The role of antioxidants has protected effect against free radical damage that may cause many diseases including cancer. Primary sources of naturally occurring antioxidants are known as whole grains, fruits, and vegetables. Several studies suggest that regular consumption of nuts, mostly walnuts, may have beneficial effects against oxidative stress mediated diseases such as cardiovascular disease and cancer. The role of antioxidants has attracted much interest with respect to their protective effect against free radical damage that may cause many diseases including cancer. Juglans regia L. (walnut) contains antioxidant compounds, which are thought to contribute to their biological properties. Polyphenols, flavonoids and flavonols concentrations and antioxidant activity of Leaves, Stems and Nuts extract of Juglans regia L. as evaluated using DPPH, ABTS, Nitric acid, hydroxyl and superoxide radical scavenging activity, lipid peroxidation and total oxidation activity were determined. The antioxidant activities of Leaves, Stems and Nuts extract of Juglans regia L. were concentration dependent in different experimental models and it was observed that free radicals were scavenged by the test compounds in all the models.

scholarly journals Role of the Anilinium Ion on the Selective Polymerization of Anilinium 2-Acrylamide-2-methyl-1-propanesulfonate

Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2349
Author(s):  
Alain Salvador Conejo-Dávila ◽  
Marco Armando Moya-Quevedo ◽  
David Chávez-Flores ◽  
Alejandro Vega-Rios ◽  
Erasto Armando Zaragoza-Contreras
Keyword(s):  
Cyclic Voltammetry ◽  
Optical Properties ◽  
Thermal Properties ◽  
Free Radical ◽  
1H Nmr ◽  
Molecular Interactions ◽  
13C Nmr ◽  
Oxidative Polymerization ◽  
Cyclic Voltammetry Analysis

The development of anilinium 2-acrylamide-2-methyl-1-propanesulfonate (Ani-AMPS) monomer, confirmed by 1H NMR, 13C NMR, and FTIR, is systematically studied. Ani-AMPS contains two polymerizable functional groups, so it was submitted to selective polymerization either by free-radical or oxidative polymerization. Therefore, poly(anilinium 2-acrylamide-2-methyl-1-propanesulfonic) [Poly(Ani-AMPS)] and polyaniline doped with 2-acrylamide-2-methyl-1-propanesulfonic acid [PAni-AMPS] can be obtained. First, the acrylamide polymer, poly(Ani-AMPS), favored the π-stacking of the anilinium group produced by the inter- and intra-molecular interactions and was studied utilizing 1H NMR, 13C NMR, FTIR, and UV-Vis-NIR. Furthermore, poly(Ani-AMPS) fluorescence shows quenching in the presence of Fe2+ and Fe3+ in the emission spectrum at 347 nm. In contrast, the typical behavior of polyaniline is observed in the cyclic voltammetry analysis for PAni-AMPS. The optical properties also show a significant change at pH 4.4. The PAni-AMPS structure was corroborated through FTIR, while the thermal properties and morphology were analyzed utilizing TGA, DSC (except PAni-AMPS), and FESEM.

Acetone-sensitized anaerobic photo-oxidation of methionine

FEBS Letters ◽  
1970 ◽  
Vol 10 (2) ◽  
pp. 129-131 ◽  
Author(s):  
G. Gennari ◽  
G. Jori
Keyword(s):  
Photo Oxidation ◽  
Oxidation Of Methionine

scholarly journals Mechanisms of Response to Salt Stress in Oleander (Nerium oleander L.)

2016 ◽  
Vol 73 (2) ◽  
pp. 249
Author(s):  
Dinesh Kumar ◽  
Mohamad Al Hassan ◽  
Oscar Vicente ◽  
Veena Agrawal ◽  
Monica Boscaiu
Keyword(s):  
Salt Stress ◽  
Abiotic Stress Tolerance ◽  
Soluble Sugar ◽  
Soluble Sugars ◽  
Nerium Oleander ◽  
Antioxidant Systems ◽  
Change Scenario ◽  
Antioxidant Compounds ◽  
Stress Dependent

Elucidating the mechanisms of abiotic stress tolerance in different species will help to develop more resistant plant varieties, contributing to improve agricultural production in a climate change scenario. Basic responses to salt stress, dependent on osmolyte accumulation and activation of antioxidant systems, have been studied in Nerium oleander, a xerophytic species widely used as ornamental. Salt strongly inhibited growth, but the plants survived one-month treatments with quite high NaCl concentrations, up to 800 mM, indicating the the species is relatively resistant to salt stress, in addition to drought. Levels of proline, glycine betaine and soluble sugars increased only slightly in the presence of salt; however, soluble sugar absolute contents were much higher than those of the other osmolytes, suggesting a functional role of these compounds in osmotic adjustment, and the presence of constitutive mechanisms of response to salt stress. High salinity generated oxidative stress in the plants, as shown by the increase of malondialdehyde levels. Antioxidant systems, enzymatic and non-enzymatic, are generally activated in response to salt stress; in oleander, they do not seem to include total phenolics or flavonoids, antioxidant compounds which did not accumulate significantly in salt-trated plants

scholarly journals The Role of Bamboo Shoot Gigantochloa apus Extract in Decreasing MDA and Increasing IL-10 at The Atherosclerosis

2019 ◽  
Vol 3 (1) ◽  
pp. 23-27
Author(s):  
Edy Soesanto ◽  
Edi Dharmana ◽  
Soeharyo Hadisaputro ◽  
Siti Fatimah Muis
Keyword(s):  
Atherogenic Diet ◽  
Control Group ◽  
Antioxidant Compounds ◽  
Bamboo Shoot ◽  
Control Group Design ◽  
Treatment Groups ◽  
New Zealand White Rabbits ◽  
Post Test ◽  
Free Radical Formation

Introduction: Bamboo shoot Gigantochloa apus extract has antioxidant compounds that act as lipid peroxidation inhibitors and reduce free radical formation so that it can be used as an anti-inflammatory and anti-oxidative stress in the atherosclerosis. Aim: Knowing the effect of bamboo shoot Gigantochloa apus extract in reducing MDA levels and IL-10 increasing levels in rabbits given atherogenic diet. Methods: This experiment used randomized pre-test and post-test with control group design, in 24 New Zealand White rabbits divided into 4 groups randomly. MDA and IL-10 levels were examined by the ELISA method. Results and conclusion: Bamboo shoot Gigantochloa apus extract can reduce MDA levels and increase IL-10 levels significantly in accordance with increasing doses. The increase of MDA levels in the control group with all treatment groups was different (p = 0.0001), and between the treatment groups and other treatment groups there were also differences (p

The role of intermolecular interactions in polyaniline/polyamide-6,6 pressure-sensitive blends studied by DFT and 1H NMR

2016 ◽  
Vol 85 ◽  
pp. 588-604 ◽  
Author(s):  
Eluise S. Lopes ◽  
Eloílson Domingos ◽  
Rodrigo S. Neves ◽  
Wanderson Romão ◽  
Kátia R. de Souza ◽  
...  
Keyword(s):  
Intermolecular Interactions ◽  
1H Nmr ◽  
Pressure Sensitive

Conformational preferences of N-acetyl-N′-methylprolineamide in different media: a 1H NMR and theoretical investigation

2019 ◽  
Vol 43 (4) ◽  
pp. 1757-1763 ◽  
Author(s):  
Carolyne B. Braga ◽  
Weslley G. D. P. Silva ◽  
Roberto Rittner
Keyword(s):  
1H Nmr ◽  
Theoretical Investigation ◽  
Conformational Preferences ◽  
Non Covalent Interactions ◽  
Covalent Interactions

The conformational preferences and role of non-covalent interactions on the geometries of Ac–Pro–NHMe were elucidated in isolated phase and solution.

Sign in / Sign up

Export Citation Format

Share Document