Plasma ascorbic acid concentrations were determined in eight men and nine women over age 65 on controlled intakes of vitamin C. Plasma ascorbic acid levels were significantly lower in elderly men compared with women for vitamin C intakes ranging from 30 to 280 mg/d. A maximum steady-state level of 1.0 mg/dL (56.78 mumol/L) ascorbic acid was observed in male subjects at an intake of approximatel...

1. There is a growing interest in the anti-oxidant characteristics and use of flavonoids in the management of cardiovascular diseases. The cardiovascular mechanism of action of these plant derivatives remains controversial. This study compared the effects of the flavonoid quercetin with those of the anti-oxidant vitamin ascorbic acid (vitamin C) on the reactivity of aortic rings from spontaneou...

Self-monitoring blood glucose (SMBG) meters are now commonly used in diabetes management. Many drugs, including ascorbic acid, are known to interfere with glucose measurements using these meters. However, so far, misdiagnosis caused by interference has rarely occurred at the conventional doses. Recently, intravenous high-dose ascorbic acid treatment has been widely used in 11,233 patients in 20...

Aqueous solutions of ascorbic acid in unsupported and supported aqueous solutions and real samples were studied by the kinetics-sensitive double-step voltcoulommetric method with the aim to contribute to a better understanding of its behavior in biological systems. The data obtained from measurements made on analytes prepared in the laboratory, as well as those made on real samples (some commer...

The experimental data concerning growth kinetics of vitamin C (L(+)-ascorbic acid, LAA) crystals in a seeded and cooling batch mass crystallization process realized in a four–compound: L(+)-ascorbic acid–methanol–ethanol–water system are reported. Influences of initial composition of solution and its linear cooling rate on “average, effective” values of crystal linear growth rate were examined....

We examined whether non-enzymatic antioxidant defense systems are disrupted in the brain of rats with water-immersion restraint stress. When rats were exposed to water-immersion restraint stress for 1.5, 3 or 6 h, the brain had decreased ascorbic acid and reduced glutathione contents and increased lipid peroxide and nitric oxide metabolites contents at 3 h and showed further changes in these co...

In the crystal structure of the title compound, C(8)H(12)O(6), mol-ecules are linked to each other by O-H⋯O hydrogen bonding.

background: oxidative stress in teratozoospermic semen samples caused poor assisted reproductive techniques (art) outcomes. among antioxidants, ascorbic acid is a naturally occurring free radical scavenger and as such its presence assists various other mechanisms in decreasing numerous disruptive free radical processes. objective: the main goal of this study was to evaluate potential protective...

OBJECTIVE To determine if there is an association between the surgical outcome of trabeculectomy and uric acid and ascorbic acid concentrations in the aqueous humor at the time of the procedure. PATIENTS, MATERIALS, AND METHODS Aqueous humor samples were collected from the eyes of 169 of 249 adult patients who underwent trabeculectomy alone for any type of glaucoma between April 1989 and July...

Although a high alimentary intake of antioxidant vitamins such as ascorbic acid may play an important role in cancer prevention, a high level of antioxidants may have quite different effects at different stages of the transformation process. In cancer development, the resistance of cells to apoptosis is one of the most crucial steps. We have tested the effects of ascorbic acid on apoptosis in H...