scholarly journals The influence of l-ascorbic acid on the rupture of the benzene ring of l-tyrosine consumed in high doses by guinea-pigs

1947 ◽  
Vol 41 (4) ◽  
pp. 511-519 ◽  
Author(s):  
H. A. Painter ◽  
S. S. Zilva
Keyword(s):  
Ascorbic Acid ◽  
Benzene Ring ◽  
Guinea Pigs ◽  
High Doses

Ascorbic acid: Effect of high doses on brain and heart catecholamine levels in guinea-pigs and rats

1973 ◽  
Vol 29 (7) ◽  
pp. 832-833 ◽  
Author(s):  
T. Dashman ◽  
D. Horst ◽  
G. Bautz ◽  
J. J. Kamm
Keyword(s):  
Ascorbic Acid ◽  
Guinea Pigs ◽  
Acid Effect ◽  
High Doses ◽  
Catecholamine Levels

Intrathoracic Platelet Accumulation in the Guinea-Pig Induced by Intravenous Administration of Arachidonic Acid - Effect of Cyclooxygenase and Thromboxane Synthetase Inhibitors

1986 ◽  
Vol 56 (03) ◽  
pp. 311-317 ◽  
Author(s):  
P A Barrett ◽  
K D Butler ◽  
R A Shand ◽  
R B Wallis
Keyword(s):  
Arachidonic Acid ◽  
Blood Volume ◽  
Intravenous Administration ◽  
Guinea Pigs ◽  
Human Albumin ◽  
Thromboxane Synthetase ◽  
Acid Effect ◽  
Rapid Accumulation ◽  
Platelet Accumulation ◽  
High Doses

SummaryIntravenous administration of arachidonic acid to guinea-pigs caused a dose-related, rapid accumulation of 51Cr-labelled platelets in the thorax. Inhibitors of cyclooxygenase inhibited the platelet accumulation, induced by arachidonic acid (30 mg/kg), at doses which did not alter the thoracic blood volume (as measured by 131I-labelled human albumin). Thromboxane synthetase inhibitors had different effects on platelet accumulation depending on the dose. CGS 12970 (3 mg/kg) and N(1-carboxyheptyl) imidazole (100 mg/kg) reduced platelet accumulation. High doses of CGS 12970 and CGS 13080 caused an apparent enhancement of platelet accumulation which was associated with pooling of blood in the thorax, as measured by either 131I-labelled human albumin or 51Cr-labelled erythrocytes. This increase in thoracic blood volume was abolished if the guinea-pigs were also pretreated with diclofenac (1 mg/kg) in addition to the thromboxane synthetase inhibitor. Increases in thoracic blood volume were also obtained following infusions of PGI2 but not PGD2 or PGE2.

scholarly journals Vitamin C—Sources, Physiological Role, Kinetics, Deficiency, Use, Toxicity, and Determination

Nutrients ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 615
Author(s):  
Martin Doseděl ◽  
Eduard Jirkovský ◽  
Kateřina Macáková ◽  
Lenka Krčmová ◽  
Lenka Javorská ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Vitamin C ◽  
Iron Absorption ◽  
Plasma Concentrations ◽  
Physiological Role ◽  
Renal Stones ◽  
Anti Oxidant ◽  
High Doses ◽  
Epigenetic Processes

Vitamin C (L-ascorbic acid) has been known as an antioxidant for most people. However, its physiological role is much larger and encompasses very different processes ranging from facilitation of iron absorption through involvement in hormones and carnitine synthesis for important roles in epigenetic processes. Contrarily, high doses act as a pro-oxidant than an anti-oxidant. This may also be the reason why plasma levels are meticulously regulated on the level of absorption and excretion in the kidney. Interestingly, most cells contain vitamin C in millimolar concentrations, which is much higher than its plasma concentrations, and compared to other vitamins. The role of vitamin C is well demonstrated by miscellaneous symptoms of its absence—scurvy. The only clinically well-documented indication for vitamin C is scurvy. The effects of vitamin C administration on cancer, cardiovascular diseases, and infections are rather minor or even debatable in the general population. Vitamin C is relatively safe, but caution should be given to the administration of high doses, which can cause overt side effects in some susceptible patients (e.g., oxalate renal stones). Lastly, analytical methods for its determination with advantages and pitfalls are also discussed in this review.

scholarly journals EFFECTS OF L-ASCORBIC ACID AND ALPHA-TOCOPHEROL ON BIOCHEMICAL PARAMETERS OF SWIMMING-INDUCED OXIDATIVE STRESS IN SERUM OF GUINEA PIGS

2016 ◽  
Vol 13 (4) ◽  
pp. 29-33 ◽  
Author(s):  
Marija Bursać-Mitrović ◽  
Dragan R. Milovanović ◽  
Radoslav Mitić ◽  
Danijela Jovanović ◽  
Miroslav Sovrlić ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Ascorbic Acid ◽  
Guinea Pigs ◽  
Biochemical Parameters ◽  
Alpha Tocopherol
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