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Type: Artigo de periódico
Title: Role Of The Phases Composition On The Incorporation Of Gallic Acid In O/w And W/o Emulsions
Author: Gomes
Andresa; Rodrigues Costa
Ana Leticia; Perrechil
Fabiana de Assis; da Cunha
Rosiane Lopes
Abstract: This work aimed to study the incorporation and preservation of gallic acid (GA) in emulsions formulated using soybean oil as oil phase, polyoxyethylene sorbitan (Tween 20) and polyglycerol polyricinoleate (PGPR) as surfactants. The systems evaluated were oil-in-water (O/W) and water-in-oil (W/O) emulsions prepared using the same aqueous to oily phases weight ratio (3:1). The volume fraction of surfactant was 0.01, 0.02 or 0.04 and gallic acid concentration in the final emulsions was 0 or 0.5% w/w. Increasing GA concentration did not show any effect on the initial or equilibrium interfacial tension (22 mN/m) in GA solution/soybean oil systems but reduced the average diameter of the droplets in both emulsions. The W/O emulsions showed bimodal droplet size distribution, pseudoplastic behavior and the presence of GA decreased the phase separation. The O/W emulsions exhibited kinetic stability, monomodal droplet size distribution and Newtonian fluid behavior. Results showed that the emulsification process was an efficient method to protect the bioactive against oxidation. Fresh O/W emulsions showed higher GA retention but during the storage time, the W/O emulsions showed a better capacity to retain the gallic acid. However, both emulsions exhibited high retention of bioactive (>86.61%) after 7 days of storage showing that this strategy could be used in different emulsified food products. (C) 2015 Elsevier Ltd. All rights reserved.
Subject: Antioxidant Activity
Nutraceutical Delivery
Country: OXFORD
Citation: Role Of The Phases Composition On The Incorporation Of Gallic Acid In O/w And W/o Emulsions. Elsevier Sci Ltd, v. 168, p. 205-214 JAN-2016.
Rights: embargo
Identifier DOI: 10.1016/j.jfoodeng.2015.07.041
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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