Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/62790
Type: Artigo de periódico
Title: Characterization and Singlet Oxygen Quenching Capacity of Spray-Dried Microcapsules of Edible Biopolymers Containing Antioxidant Molecules
Author: Faria, AF
Mignone, RA
Montenegro, MA
Mercadante, AZ
Borsarelli, CD
Abstract: Microcapsules of gum arabic or maltodextrin 20DE containing antioxidant molecules (AOx), for example, carotenoids and tocopherol derivatives, were prepared by the spray-drying technique. The properties of these microcapsules were evaluated by several techniques, such as dynamic light scattering, scanning electronic microscopy, and steady-state and time-resolved fluorescence spectroscopy of microencapsulated pyrene. The quenching of photochemically generated singlet molecular oxygen (O-1(2)) by the AOx in homogeneous solvents as well as in microcapsule solutions was evaluated using time-resolved phosphorescence detection of O-1(2). The quenching rate constant of the process, k(Q)(AOx), was strongly dependent on the type of the AOx. These results are explained by compartmentalization effects of the AOx in the core of the microcapsules and the accessibility of O-1(2). The contribution of the biopolymer as quencher of O-1(2) was also investigated. The present results can be applied to the design of edible antioxidant microcapsules within the food and cosmetic industries.
Subject: Microencapsulation
carotenoids
tocopherols
singlet oxygen
antioxidant activity
spray drying
pyrene fluorescence
Country: EUA
Editor: Amer Chemical Soc
Rights: fechado
Identifier DOI: 10.1021/jf100925j
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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