Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/198883
Type: Artigo de periódico
Title: Characterization And Singlet Oxygen Quenching Capacity Of Spray-dried Microcapsules Of Edible Biopolymers Containing Antioxidant Molecules.
Author: Faria, Adelia F
Mignone, Ricardo A
Montenegro, Mariana A
Mercadante, Adriana Z
Borsarelli, Claudio D
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 ((1)O(2)) by the AOx in homogeneous solvents as well as in microcapsule solutions was evaluated using time-resolved phosphorescence detection of (1)O(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 (1)O(2). The contribution of the biopolymer as quencher of (1)O(2) was also investigated. The present results can be applied to the design of edible antioxidant microcapsules within the food and cosmetic industries.
Subject: Antioxidants
Biopolymers
Capsules
Food Additives
Singlet Oxygen
Rights: fechado
Identifier DOI: 10.1021/jf100925j
Address: http://www.ncbi.nlm.nih.gov/pubmed/20521822
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

Files in This Item:
File SizeFormat 
pmed_20521822.pdf1.95 MBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.