Distribution of catechol in emulsions

• Type: Article in International Scientific Journal
• Date: 2014

Authors

Losada Barreiro, S (Author) Other; Bravo Diaz, C (Author) Other; Costa, M (Author) Other; Paiva Martins, F (Author) FCUP

Journal

Title: Journal of Physical Organic Chemistry

Vol. 27

Pages: 290-296

ISSN: 0894-3230

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 12 Citations

Scopus - 14 Citations

Other information

Authenticus ID: P-008-DHS

DOI: 10.1002/poc.3196

Abstract (EN): In this work, we have evaluated the effects of emulsifier concentration on the distribution of catechol (1,2-dihydroxybenzene, CAT) in food-grade emulsions composed of stripped corn oil, acidic water, and Tween 20. Auxiliary experiments in binary stripped corn oil-water mixtures, in the absence of emulsifier, showed that CAT is both oil and water soluble (partition constant P-W(O) = 0.34). Addition of Tween 20 to prepare kinetically stable emulsions creates an interfacial region, and the distribution of CAT is now described by two partition constants, that between the oil and interfacial region, P-O(I), and that between the aqueous and interfacial region, P-W(I). These partition constants were determined in the intact emulsion by employing a kinetic method that exploits the reaction between the hydrophobic 4-hexadecylbenzenediazonium ions, 16-ArN2+, and CAT. Results show that CAT distributes between the three regions. At emulsifier volume fractions of phi(I)=0.005, CAT is predominantly located (similar to 61%) in the aqueous region, about 26% is in the interfacial region, and only a small fraction (similar to 13%) in the oil region. An increase in emulsifier concentration promotes the incorporation of CAT to the interfacial region up to similar to 70% at phi(I)=0.037. Results obtained should contribute to a better understanding of the antioxidant efficiency in inhibiting lipid oxidation and to the development of new strategies to prepare healthier and more nutritional foods with longer shelf life. Copyright (c) 2013 John Wiley & Sons, Ltd.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7