Plant Polyphenols as Antioxidants for Ascorbic Acid*

Encapsulation of polyphenolic antioxidants from medicinal plant extracts in alginate–chitosan system enhanced with ascorbic acid by electrostatic extrusion

“…Namely, ascorbic acid is relatively stable in the dry state but is rapidly oxidized to dehydroascorbic acid in neutral or basic solutions in the presence of oxygen. This oxidation is also catalyzed by the presence of heavy metal ions (Clemetson & Andetsen, 1966). The loss of ascorbic acid in liquid medium, such as fruit juices during refrigerated storage is well documented in literature (Yeom, Streaker, Zhang, & Min, 2000).…”

Developmentally related responses of maize catalase genes to salicylic acid.

“…The mechanisms by which SA stimulates germination and growth are not clear. It has been proposed that SA possesses chelating properties (33,34) and the chelation of some important elements of cellular and organellar membranes leads to increased permeabilities by SA, allowing the free access of some metabolites involved in the induction of germination.…”

Food Intake, Dietary Supplements and Survival Time of Scorbutic Guinea Pigs

“…The exact nature of the relationship between ascorbic acid and flavonoids has been widely discussed in recent years. There is evidence that the administration of flavonoids often in creases the concentration of ascorbic acid in guinea-pig organs but is without any marked effect on the survival times of scorbutic guinea pigs (4,7,10,14,16). The results described in this paper indicate that flavonoids are unable to replace ascorbic acid completely; any nutritional relationship between them and ascor bic acid is therefore either synergistic or incompletely substitutive in nature.…”