Cut-off effect of radical TEMPO derivatives in olive oil-in-water emulsions.
Three oil-in-water emulsions were prepared from mixtures of olive oil and Tween 20 in water. The effectiveness of a series of radical 2,2,6,6-tetramethylpiperidinoxyl (TEMPO) derivatives of variable lipophilicity in reactions with antioxidant Trolox, and as pyrene-fluorescence quenchers, was compared in the three emulsions. A "cut-off" effect was observed for the pyrene quenching by the probes, but not for their reaction with Trolox. The results were rationalized in terms of the amphiphobic nature of the probes, and the different locations of probe, pyrene and Trolox in the three-phase microheterogeneous systems.
Facultad de Química y Biología, Universidad de Santiago de Chile, Casilla 40 Correo 33, Santiago de, Chile.
Amaia
A
Lopez de Arbina
Facultad de Química y Biología, Universidad de Santiago de Chile, Casilla 40 Correo 33, Santiago de, Chile.
Marcos Caroli
MC
Rezende
Facultad de Química y Biología, Universidad de Santiago de Chile, Casilla 40 Correo 33, Santiago de, Chile; Centro para el Desarrollo de la Nanociencia y la Nanotecnología, CEDENNA, Chile. Electronic address: carolina.aliaga@usach.cl.
Carolina
C
Aliaga
D000975:Antioxidants / Q000737:chemistry; D002839:Chromans / Q000737:chemistry; D004655:Emulsions / Q000737:chemistry*; D000069463:Olive Oil / Q000737:chemistry*; D011136:Polysorbates; D011721:Pyrenes / Q000737:chemistry; D014867:Water / Q000737:chemistry*
D000975:Antioxidants; D002839:Chromans; D004655:Emulsions; D000069463:Olive Oil; D011136:Polysorbates; D011721:Pyrenes; D014867:Water; C030984:pyrene; C010643:6-hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid
Cut-off effect; Oil-in-water emulsions; Pyrene quenching; Reaction with Trolox; TEMPO derivatives