Results 21 to 30 of about 5,060 (171)

Redox Properties of Human Erythrocytes Are Adapted for Vitamin C Recycling

Frontiers in Physiology, 2021
Ascorbic acid (AA; or vitamin C) is an important physiological antioxidant and radical scavenger. Some mammalian species, including homo sapiens, have lost the ability to synthetize AA and depend on its nutritional uptake.
Michael Eigenschink, Danylo Savran, Christoph P. Zitterer, Sebastian Granitzer, Sebastian Granitzer, Magdalena Fritz, David M. Baron, Ernst W. Müllner, Ulrich Salzer   +8 more
doaj   +1 more source

Vitamin C controls neuronal necroptosis under oxidative stress

Redox Biology, 2020
Under physiological conditions, vitamin C is the main antioxidant found in the central nervous system and is found in two states: reduced as ascorbic acid (AA) and oxidized as dehydroascorbic acid (DHA).
Luciano Ferrada, María Jose Barahona, Katterine Salazar, Peter Vandenabeele, Francisco Nualart   +4 more
doaj   +1 more source

Neutrophils Isolated from Septic Patients Exhibit Elevated Uptake of Vitamin C and Normal Intracellular Concentrations despite a Low Vitamin C Milieu

Antioxidants, 2021
Vitamin C (ascorbate) plays an important role in neutrophil function and is accumulated by the cells either directly via vitamin C transporters (SVCT) or indirectly following oxidation to dehydroascorbic acid.
Anitra C. Carr, Stephanie Bozonet, Juliet Pullar, Emma Spencer, Patrice Rosengrave, Geoff Shaw   +5 more
doaj   +1 more source

The content of ascorbic and dehydroascorbic acids and vitamin C in non-preserved juices, depending on their type and storage time

Roczniki Panstwowego Zakladu Higieny, 2021
Background. Vitamin C is one of the most important water-soluble vitamins. It is responsible for many important functions in the body, including: it has a positive effect on maintaining immunity, protects the body against free radicals, and also ...
Małgorzata Ewa Drywień, Joanna Frąckiewicz, Sylwia Szpoton   +2 more
doaj   +1 more source

Effect of Dehydroascorbic Acid in Rabbits

Experimental Biology and Medicine, 1953
SummaryIntravenous injections of de-hydroascorbic acid in rabbits in the dose 1 g/kg or 1.5 g/kg could not produce either persistent hyperglycemia or persistent diabetic type of glucose tolerance curve. Rabbits so treated neither excreted sugar in the urine nor showed any histological changes in the pancreas, suprarenal and pituitary.
S, BANERJEE, B, BELAVADY, A K, MUKHERJEE
openaire   +2 more sources

Out‐of‐Equilibrium Supramolecular Assembly Sustained by Photocatalysis

Angewandte Chemie, EarlyView.
Catalysis sustains structure: A Pt(II) supramolecular photocatalyst persists in a far‐from‐equilibrium state only as long as it remains photocatalytically active. Without ongoing catalytic activity, the system irreversibly relaxes into a thermodynamically stable but inactive state (PtB). Catalysis is essential for sustaining its structure.
E. Pelorosso, M. Scaccaglia, A. Fortunato, D. Alessi, F. Arcudi, A. Aliprandi   +5 more
wiley   +2 more sources

Ascorbic acid and copper in linoleate oxidation. II. Ascorbic acid and copper as oxidation catalysts

Journal of Lipid Research, 1969
Both ascorbic acid and copper were strong prooxidants in the oxidation of linoleate in a buffered (pH 7.0) aqueous dispersion at 37°C. Minimum concentrations at which catalytic activity was detected were 1.3 × 10-7m for copper and 1.8 × 10-6m for ...
Gottfried Haase, W.L. Dunkley
doaj   +1 more source

Influence of the Phenological Stage and Harvest Date on the Bioactive Compounds Content of Green Pepper Fruit

Molecules, 2021
Green pepper fruit is often consumed before it is completely ripe. However, the influence of the phenological stage in which the green pepper is consumed as a potential influencing factor in its bioactive compounds content and antioxidant capacity ...
Alicia Dobón-Suárez, María J. Giménez, Salvador Castillo, María E. García-Pastor, Pedro J. Zapata   +4 more
doaj   +1 more source

Effect of Physiological Concentrations of Vitamin C on the Inhibitation of Hydroxyl Radical Induced Light Emission from Fe²⁺-EGTA-H₂O₂ and Fe³⁺-EGTA-H₂O₂ Systems In Vitro

Molecules, 2021
Ascorbic acid (AA) has antioxidant properties. However, in the presence of Fe2+/Fe3+ ions and H2O2, it may behave as a pro-oxidant by accelerating and enhancing the formation of hydroxyl radicals (•OH). Therefore, in this study we evaluated the effect of
Michal Nowak, Wieslaw Tryniszewski, Agata Sarniak, Anna Wlodarczyk, Piotr J. Nowak, Dariusz Nowak   +5 more
doaj   +1 more source

Citrus Fruit Ascorbic Acid Extraction and Quantification by HPLC

Bio-Protocol, 2015
Citrus are among the most relevant sources of vitamin C (ascorbic acid + dehydroascorbic acid). Recent studies have revealed that it increases in the peel as fruit ripens and remains constant or even decreases in the pulp tissue.
Enriqueta Alós, Joanna Lado, María Rodrigo, Lorenzo Zacarías   +3 more
doaj   +1 more source