Localized lipid autoxidation initiated by two-photon irradiation within single oil droplets in oil-in-water emulsions

Food Chemistry
Piret RaudseppMogens L Andersen

Abstract

The initiation of lipid autoxidation within single oil droplets in Tween-20-stabilized oil-in-water emulsion was achieved by highly focused two-photon (2P) irradiation at excitation wavelength (λex) 700nm. The radical formation was enhanced by inclusion of the photo-cleavable radical initiator di-tert-butyl peroxide (DTBP) into the droplets, and demonstrated with confocal microscopy using radical-sensitive probe BODIPY(665/676). The radical chain reactions progressed up to 60μm; however, there were no indications of oxidation in neighboring droplets demonstrating that radicals and oxidized probe molecules were not able to migrate between oil droplets. In addition, the spatial propagation of lipid autoxidation increased with the degree of oil unsaturation.

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Citations

Jan 27, 2017·Annual Review of Food Science and Technology·Mickaël LaguerreSimona Birtić
Feb 11, 2020·Analytical Chemistry·Xin ZhangZhangjun Hu
Nov 30, 2021·Critical Reviews in Food Science and Nutrition·Pierre VilleneuveEric A Decker

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