The location of phenolic antioxidants and radicals at interfaces determines their activity.

The location of phenolic antioxidants and radicals at interfaces determines their activity. Research Abstract Details 

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The location of phenolic antioxidants and radicals at interfaces determines their activity. Abstract Text:

Anja Heins,Donald B McPhail,Tobias Sokolowski,Heiko ,Karin Schwarz,Anja Heins,Donald B McPhail,Tobias Sokolowski,Heiko ,Karin Schwarz,

To characterize parameters influencing the antioxidant activity at interfaces a novel ESR approach was developed, which facilitates the investigation of the reaction stoichiometry of antioxidants towards stable radicals. To relate the activity of antioxidants towards the location of radicals at interfaces NMR experiments were conducted. Micellar solutions of SDS, Brij and CTAB were used to model interfaces of different chemical nature. The hydrophilic Fremy's radical was found to be solubilized exclusively in the aqueous phase of SDS micellar solution but partitioned partly into the hydrophilic headgroup area of Brij micelles. In contrast the hydrophobic galvinoxyl was exclusively located in the micellar phase with the increasing depth of intercalation in the order SDS < Brij < CTAB. Gallates revealed a higher stoichiometric factor towards galvinoxyl in CTAB systems, which is accounted to a concentration effect of antioxidant and radical being both solubilized in the palisade layer. In contrast, in SDS solutions hardly any reaction between galvinoxyl and gallates was found. SDS acted as a physical barrier between radical (palisade layer) and antioxidant (stern layer). The influence of the hydrophobic properties of the antioxidant was clearly seen in Brij micelles. Elongation of the alkyl chain in gallate molecule resulted in increasing stoichiometric factors in the presence of galvinoxyl being located in the deeper region of the bulky headgroup area. The reverse trend was found in the presence of Fremy's radical being located in the hydrated area of the micelles.

The location of phenolic antioxidants and radicals at interfaces determines their activity. Publishing Authors By Initials

A Heins,DB McPhail,T Sokolowski,H ,K Schwarz,A Heins,DB McPhail,T Sokolowski,H ,K Schwarz,

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The location of phenolic antioxidants and radicals at interfaces determines their activity. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Lipids

VOLUME: 42

Page Numbers: 573-82

Journal Abbreviation: Lipids

ISSN: 0024-4201

DAY: 1

MONTH: 05

YEAR: 2007

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LANGUAGE: eng

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Grant and Affiliation Information for The location of phenolic antioxidants and radicals at interfaces determines their activity.

AFFILIATION: Institute of Human Nutrition and Food Science, University of Kiel, Heinrich-Hecht-Platz 10, 24118 Kiel, Germany. info@foodtech.uni-kiel.de

Country: United States

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MEDLINETA: Lipids

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