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Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

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Record number 496884
Title Effect of lipophilization on the distribution and reactivity of ingredients in emulsions
Author(s) Leong, Wai Fun; Berton-Carabin, C.C.; Elias, Ryan J.; Lecomte, Jérôme; Villeneuve, Pierre; Zhao, Yu; Coupland, John N.
Source Journal of Colloid and Interface Science 459 (2015). - ISSN 0021-9797 - p. 36 - 43.
DOI http://dx.doi.org/10.1016/j.jcis.2015.07.070
Department(s) Food Process Engineering
VLAG
Publication type Refereed Article in a scientific journal
Publication year 2015
Keyword(s) Electron paramagnetic resonance (EPR) - Emulsion - Small molecule partitioning - Spin probe - TEMPOL
Abstract

Hypothesis: The reactivity of small molecules in emulsions is believed to depend on their partitioning between phases, yet this is hard to verify experimentally in situ. In the present work, we use electron paramagnetic resonance (EPR) spectroscopy to simultaneously measure the distribution and reactivity of a homologous series of lipophilized spin probes in an emulsion. Experiments: 4-Hydroxy-2,2,6,6-tetramethylpiperidin-1-oxyl (TEMPOL) was derivatized with saturated fatty acids to create a series of spin probes with increasing lipophilicity (C4-, C8-, C12-, and C16-TEMPO). The probes were added to a 10wt.% tetradecane-in water emulsions (d32~190nm) stabilized with sodium caseinate (1wt.% in the aqueous phase, pH 7). The distribution of the probes between phases was measured by electron paramagnetic resonance (EPR) spectroscopy. Findings: TEMPOL partitioned into the aqueous phase, C4-TEMPO distributed between the lipid and aqueous phases (69% and 31% respectively) while the more lipophilic probes dissolved exclusively within the lipid droplets. Interestingly, the more lipophilic probes initially precipitated upon their addition to the emulsion, and only slowly redistributed to the droplets over hours or days, the rate of which was dependent on their carbon chain length. The reactivity of the probes with aqueous an aqueous phase reductant (ascorbate) generally depended on the proportion in the aqueous phase (i.e., TEMPOL. >C4-TEMPO. >C8-TEMPO~C12-TEMPO~C16-TEMPO).

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