Examples of ascorbate

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The pecking order of free radicals and antioxidants: lipid peroxidation, a-tocopherol and ascorbate.
However, ascorbate peroxidase activity was very low and did not change, whereas peroxidase activity decreased steadily during desiccation.
Ascorbate acts at the water-lipid interface to recycle tocopherol radical and thus inhibit the chain of lipid peroxidation.
During its antioxidant action, ascorbate undergoes two consecutive one electron oxidations to dehydroascorbic acid with intermediate formation of the ascorbate radical.
The initial ascorbate radical signal amplitude is directly proportional to the overall rate of ascorbate oxidation, whereas the signal duration is inversely proportional.
Strikingly, exogenously applied ascorbate, a predominantly neuronal antioxidant, could compensate for the loss of any other single component of the antioxidant network.
The sodium ascorbate solution was prepared just prior to use.
However, in the cotyledons, no ascorbate peroxidase activity was detected at any water content, and peroxidase activity was gradually reduced as desiccation proceeded.
We hypothesize that ascorbate is an integral component of the photoreceptorsynaptic release mechanism.
These data demonstrate than an ascorbate-oxidizing activity is increased in plasma from women with preeclampsia.
Consequently, cellular regulation of ascorbate is speciesindependent, so that whether an animal can synthesize ascorbate should not influence other components of the antioxidant network.
In addition, ascorbate (0.5%) was routinely added to reduce the oxidation of the released catecholamines.
This action of ascorbate would occur regardless of the presence or absence of retinal dopamine and would thereby constitute the normal response to a flash.
These critical water contents corresponded to water contents below which activities of free radicalscavenging enzymes (ascorbate peroxidase, peroxidase and superoxide dismutase) decreased rapidly during desiccation.
It is possible that ascorbate, present in follicular fluid, induces taurine and hypotaurine accumulation in rabbit oviduct fluid at the time of ovulation.
Assessment of these data prompted two experiments to determine whether endogenous factors in blood and plasma from women with preeclampsia escalate oxidative depletion of ascorbate in vitro.
Plasma ascorbate completely protects plasma lipoproteins from peroxidation during exposure to a wide spectrum of water- or lipid-soluble free radical generators in vitro.
In the present study, we have focused on the relationship between desiccation sensitivity and activities of free radical-scavenging enzymes (ascorbate peroxidase, peroxidase and superoxide dismutase) in seeds.
Ascorbate peroxidase activity increased during this process but declined when the leaf was desiccated.
Tocopherol was extracted by grinding seed tissue in ice-cold 2:1 hexane:aqueous ascorbate (10% w/v).

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