Control of antioxidant efficiency of chlorogenates in emulsions: modulation of antioxidant interfacial concentrations

• Type: Article in International Scientific Journal
• Date: 2019

Authors

Meireles, M (Author) Other; Losada Barreiro, S (Author) Other; Costa, M (Author) Other; Fatima Paiva Martins (Author) FCUP; Bravo Diaz, C (Author) Other; Monteiro, LS (Author) Other

Journal

Title: Journal of the Science of Food and Agriculture

Vol. 99

Pages: 3917-3925

ISSN: 0022-5142

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 24 Citations

Scopus - 27 Citations

Other information

Authenticus ID: P-00Q-B89

DOI: 10.1002/jsfa.9615

Abstract (EN): BACKGROUND Controlling the interfacial concentrations of antioxidants (AOs) in oil-in-water emulsions can be regarded as a unique approach for increasing the efficiency of AOs in inhibiting the oxidation of lipids. Classical methods to determine the AO distribution in binary systems cannot be employed and their distribution needs to be assessed in the intact emulsion. RESULTS We have employed a well-established kinetic method to determine the distribution of a homologous series of AOs derived of chlorogenic acid in olive oil-in-water emulsions and analyse the effects of AO hydrophobicity on their distributions and their efficiencies. Results indicate that variations in the efficiency of chlorogenates in emulsions are due to differences in their interfacial concentrations. Their interfacial concentrations AO(I) were much higher (20- to 150-fold) than their stoichiometric concentrations. On the other hand, their concentrations in the oil region were 1.5- to 0.1-fold. Results also show the complex effect of the oil-to-water ratio employed in the preparation of the emulsions on the (AO(I)) values. CONCLUSION Results highlight the key role of the interfacial region and of its composition (interfacial AO molarity, emulsifier concentration, oil-to-water ratio) in interpreting the efficiency of AOs in inhibiting lipid oxidation in emulsions. Thus, a careful modulation of these parameters is necessary to ensure optimum AO efficiency. (c) 2019 Society of Chemical Industry

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9