نتایج جستجو برای: ascorbic acid contents
تعداد نتایج: 820119 فیلتر نتایج به سال:
a carbon paste electrode modified with cobalt (ii) phthalocyanine (copc) was used as a sensitive potentiometric sensor for determination of ascorbic acid in aqueous solutions. the potential response of the electrode is a linear function of ascorbic acid concentration over the range 5 10 to 10 m (?1- 1800 µg ml ) with a nernstian slope of 56 mv at ph 7. the limit of detection was 0.2 µg ml ascor...
As part of our search for natural antioxidants, this work presents an evaluation of antioxidant activities of methanolic extract of Oxalis corniculata and its sub-fractions in hexane, chloroform, ethyl acetate, n-butanol and water. The total phenolic contents in terms of µg of gallic acid equivalents per mg of dried mass were approximately 21.0, 28.2, 34.5, 162.0, 70.0, and 49.2 in methanolic, ...
to evaluate the effect of drought stress and foliar application of ascorbic acid on the growth and yield parameters of two varieties of sunflower pilot plant in the province of alborz as a split factorial in a randomized complete block design with four replications and treatments include: water stress (s) in three levels (s1) 70 mm evaporation from pan class a, (s2) 110 mm evaporation from pan ...
It is known that, of all animal species studied, only man, other Primates, and the guinea pig are unable to synthesize ascorbic acid. Results obtained in rats, with radioactive glucose, indicate that ascorbic acid is synthesized by a fairly direct route from glucose (l-3), but no information has been available concerning the rate of synthesis and metabolism of ascorbic acid. Such information wo...
The L-gulono-γ-lactone oxidase gene (Gulo) encodes an essential enzyme in the synthesis of ascorbic acid from glucose. On the basis of previous findings of bone abnormalities in Gulo (-/-) mice under conditions of ascorbic acid insufficiency, we investigated the effect of ascorbic acid insufficiency on factors related to bone metabolism in Gulo (-/-) mice. Four groups of mice were raised for 4 ...
The effect of ascorbic acid on the conversion of dopamine to norepinephrine was investigated in isolated chromaffin granules from bovine adrenal medulla. Ascorbic acid was shown to double the rate of [3H]norepinephrine formation from [3H]dopamine, despite no demonstrable accumulation of ascorbic acid into chromaffin granules. The enhancement of norepinephrine biosynthesis by ascorbic acid was d...
Ascorbic acid has been reported to extend replicative life span of human embryonic fibroblast (HEF). Since the detailed molecular mechanism of this phenomenon has not been investigated, we attempted to elucidate. Continuous treatment of HEF cells with ascorbic acid (at 200 microM) from 40 population doubling (PD) increased maximum PD numbers by 18% and lowered SA-beta-gal positive staining, an ...
Preliminary phytochemical screening was carried out for pet ether, chloroform and ethanol extracts of Holarrhena antidysentrica leaves. The extracts showed the presence of various phytocompounds like alkaloids and flavonoids. In vitro antioxidant activity was carried out with all the three extracts using DPPH assay using ascorbic acid as a standard. All the extracts had shown significant antiox...
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