Detection of orange juice frauds using front-face fluorescence spectroscopy and independent components analysis

The aim of this study was to find simple objective analytical methods to assess the adulteration of orange juice by grapefruit juice. The adulterations by addition of grapefruit juice were studied by 3D-front-face fluorescence spectroscopy followed by Independent Components Analysis (ICA) and by classical methods such as free radical scavenging activity and total flavonoid content. The results of this study clearly indicate that frauds by adding grapefruit juice to orange juice can be detected at percentages as low as 1%

Microstructural, electrical and magnetic properties of Fe35Co65 thin films grown by thermal evaporation from mechanically alloyed powders

Équipe 101 : Nanomagnétisme et électronique de spinInternational audienceWe demonstrate the efficiency of a method for high magnetization alloy deposition, using thermal evaporation of a nanocrystalline mixture prepared by mechanical alloying process using high energy ball milling. A detailed study of the stoichiometry, microstructural, electrical and magnetic properties of the obtained Fe35Co65 thin films is reported. Good homogeneity, purity and stoichiometry were demonstrated in the powder composed of 25 nm mean crystallite size. Microstructural analysis of thin films ranging from 9 to 50 nm deposited on Si (001) shows that the stoichiometry of the evaporated nanocrystalline mixture is conserved over the whole thickness range and that (110) texture forms as the film thickness increases. High saturation magnetization, good hysteresis squareness and high electrical resistivity FeCo thin films could be achieved by thermal evaporation from properly set mechanically alloyed powders