Replication Data for: A stoichio-kinetic model for a DPPH ̇ -Ferulic acid reaction

Full set of experimental raw files related to DPPH spontaneous reduction and reduction by ferulic acid and by diferulic acid. Gnucash files were created during experiments with the fork https://github.com/gijut/gnucash and later updated with related raw file names. An automated process exported the raw data to Matlab compatible format. (2018-10-24

A stoichio-kinetic model for a DPPH center dot -ferulic acid reaction

International audienceEstimates of the activity of antioxidants in the literature often appear inconsistent. In the specific case of the DPPH center dot test, the diversity of measurements may arise from variations in the protocols followed. This paper proposes an unbiased method which models the reduction mechanism. This method is applied to the reduction of DPPH center dot by ferulic acid. A scheme with eight coupled reactions is proposed and has been validated on different solvents and using a wide range of DPPH center dot, ferulic acid, and 5,5'-diferulic acid concentrations, and verified using data from the literature on ferulic acid activity. This modeling approach permits a correction to the bias of the 8th reaction (spontaneous reduction of DPPH center dot), because of its sensitivity to solvent, which in most cases is not taken into account. The best experimental strategy to determine the Efficient Concentration of ferulic acid to reduce 20% (EC20) and 50% (EC50) of DPPH center dot is then detailed in terms of initial DPPH center dot concentrations and the duration of the experiment

Prediction of the vitamin C degradation in simple liquid model

Prediction of the vitamin C degradation in simple liquid model. 1. Food Chemistry Conferenc

Carnosic acid from rosemary extracts limits oxidation in edible oils and protects endogenous alpha-tocopherol : a mechanistic approach

Carnosic acid from rosemary extracts limits oxidation in edible oils and protects endogenous alpha-tocopherol : a mechanistic approach. 28. International Conference on Polyphenol

Vitamin C degradation during thermal treatment: reaction pathways in an aqueous solution and multi-response modeling

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Oxygen solubility measured in aqueous or oily media by a method using a non-invasive sensor

The amount of dissolved oxygen (O2) in oils is one of the major factors that affect the extent of oil oxidation reactions. The aim of this work was to develop an experimental method to determine the Henry's law constant in oils, using a portable optical device for easy and non-intrusive O2 partial pressure measurement. The principle is based on the effect of quenching of luminescence by oxygen using a sensor probe glued inside a transparent glass flask. The method uses a mass conservation equation written for oxygen in both liquid and gaseous phases inside a closed flask. It was validated on water in the range of 5–50 °C, and then applied to non-polar media (dodecane, vegetable oil and Miglyol). The results show that oxygen is 5 times more soluble in sunflower oil than in water. This method is easy-to-implement and makes it possible to measure the Henry's constant for O2 in various types of vegetable oils

Use of food and packaging model Matrices to investigate the antioxidant properties of biorefinery grass lignins

The antioxidant properties of grass lignins recovered from an alkaline industrial process and from different ethanol organosolv pretreatment processes were compared using two types of tests: (i) classical radical 2,2′-diphenyl-1-picrylhydrazyl (DPPH•) scavenging tests in dioxane/water or ethanol and (ii) tests involving multiphasic systems (lipid dispersion in water or cellulose film suspended in ethanol). These multiphasic systems were representative of food and packaging matrices in view of high-value applications. All lignins, in solution or in the film, effectively scavenged radicals. Moreover, they were competitive with a food commercial rosemary extract to protect linoleic acid against oxidation. Whereas the DPPH• test in dioxane was not discriminant, differences appeared between lignins when the test was performed in ethanol or with the multiphasic systems. Moreover, radical scavenging activity was preserved in the film even after its immersion in ethanol. Structural analysis of lignins revealed that low-molar-mass phenolics, namely p-hydroxycinnamic acids and lignin depolymerization products, governed lignin antioxidant properties in the multiphasic systems