How the Multiple Antioxidant Properties of Ascorbic Acid Affect Lipid Oxidation in Oil-in-Water Emulsions

Abstract

Lipid oxidation is a serious problem for oil-containing food products because it negatively affects shelf life and nutritional composition. An antioxidant strategy commonly employed to prevent or delay oxidation in foods is to remove oxygen from the closed food-packaging system. An alternative technique is use of an edible oxygen scavenger to remove oxygen within the food. Ascorbic acid (AA) is a particularly promising antioxidant because of its natural label and multiple antioxidative functions. In this study, AA was tested as an oxygen scavenger in buffer and an oil-in-water (O/W) emulsion. The effects of transition metals on the ability of AA to scavenge oxygen were determined. Headspace oxygen decrease less than 1% in the medium-chain triacylglycerol (MCT) O/W emulsion system (pH 3 and 7). AA was able to almost completely remove dissolved oxygen (DO) in a buffered solution. Transition metals (Fe(2+) and Cu(+)) significantly accelerated the degradation of AA; however, iron and copper only increased DO depletion rates, by 10.6-16.4% from day 1 to 7, compared to the control. AA (2.5-20 mM) decreased DO in a 1% O/W emulsion system 32.0-64.0% and delayed the formation of headspace hexanal in the emulsion from 7 to over 20 days. This research shows that, when AA is used in an O/W emulsion system, oxidation of the emulsion system can be delay by multiple mechanisms.

Photo‐Curable Metal‐Chelating Coatings Offer a Scalable Approach to Production of Antioxidant Active Packaging

“…Ascorbic acid is often used as a natural antioxidant in foods to prevent oxidation of other food components (for example, lipids) (McClements & Decker, ; Uluata, McClements, & Decker, ) and to reduce enzymatic browning (Pizzocaro, Torreggiani, & Gilardi, ; Sapers et al., ). Transition metals promote ascorbic acid degradation by inducing the oxidation of ascorbic acid to dehydroascorbic acid, which is unstable and undergo further degradation reactions (Bradshaw, Barril, Clark, Prenzler, & Scollary, ).…”

Induction of Low-Level Hydrogen Peroxide Generation by Unbleached Cotton Nonwovens as Potential Wound Dressing Materials

“…The addition of ascorbate to greige cotton resulted in a significant increase in the production of H 2 O 2 (Table 1). Ascorbate has also been demonstrated to reduce Cu(II) to Cu(I), and further induce the generation of H 2 O 2 [33]. However, the addition of Cu(II) sulfate to greige cotton did not induce significant changes in the production of H 2 O 2 .…”

Exposure‐induced changes of plasma metabolome and gene expression in patients with panic disorder

“…This and another four metabolites (nominal effects over three time points in both measurements: ascorbic acid, 2‐oxobutanoate, homocysteine, and glutamine) might be candidates for further studies. Interestingly, ascorbic acid is implicated in oxidative metabolism and was the only metabolite significantly associated with anxiety measures during the therapy (Uluata, McClements, & Decker, ). A previous study reported an association between oxidative stress and certain anxiety disorders (obsessive‐compulsive disorder and PD), implicating that oxidative metabolism may affect anxiety (Kuloglu et al, ).…”