نتایج جستجو برای: l ascorbic acid determination
تعداد نتایج: 1496572 فیلتر نتایج به سال:
L-ascorbic acid is found in equilibrium with its oxidative degradation product, L-dehydroascorbic acid, which is used in the body in the same way as ascorbic acid. L-dehydroascorbic acid has its maximum stability at room temperature at pH 2-3 and it will at pH values above 7 degrade irreversibly during formation of 2,3-diketogulonic acid which shows no vitamin C activity. Finally, at high pH va...
background: an essential oil is a liquid that is generally distilled from the leaves, stems, flowers or other elements of a plant. objective: cumin (cuminum cyminum l.) essential oil (ceo) was analyzed to determine oil component. antifungal effect of ceo was determined by in vitro technique. in second stage, effect of different concentrations of ceo by pdm on postharvest life of strawberry (fra...
Ascorbic acid is catabolized to yield oxalate from carbon atoms 1 and 2 (1, 2) and carbon dioxide from carbon atom 1 in man as well as in other species (3-5). It has also been shown that n-glucuronolactone is converted to ascorbic acid in the human 63. The present studies were designed to determine the n-ascorbic acid metabolic pool size and turnover rate, the fraction of the urinary oxalate wh...
BACKGROUND Observational studies showed that circulating L-ascorbic acid (vitamin C) is inversely associated with cardiometabolic traits. However, these studies were susceptible to confounding and reverse causation. OBJECTIVES We assessed the relation between L-ascorbic acid and 10 cardiometabolic traits by using a single nucleotide polymorphism in the solute carrier family 23 member 1 (SLC23...
A gold electrode modified with diethylenetriaminepentaacetic acid (DTPA) has been fabricated to selectively detect dopamine (DA). The influences of experimental parameters were investigated and optimized. The anodic peak current is proportional to the concentration of DA in the range of 1.0 x 10(-7)-6.0 x 10(-3) mol L(-1) with a detection limit of 3.0 x 10(-8) mol L(-1) (S/N = 3). DA contents i...
In this paper, CdTe quantum dot (QD)@silica nanobeads were used as modulated photoluminescence (PL) sensors for the sensing of ascorbic acid in aqueous solution for the first time. The sensor was developed based on the different quenching effects of Fe(2+) and Fe(3+) on the PL intensity of the CdTe QD@ silica nanobeads. Firstly, the PL intensity of the CdTe QDs was quenched in the presence of F...
A simple and sensitive spectrofluorometric method was developed for the simultaneous determination of ascorbic acid and cysteine by a flow-injection system. This method is based on the reduction of Tl(III) with ascorbic acid or cysteine in acidic media, producing fluorescence reagent, TlCl3(2-) (lambdaex = 227 nm, lambdaem = 419 nm). The injected sample solution was divided into two separate st...
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