期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 61, 期 26, 页码 6533-6543出版社
AMER CHEMICAL SOC
DOI: 10.1021/jf400981x
关键词
polar paradox; cutoff effect; antioxidant distributions; antioxidant efficiency; emulsions; arenediazonium ions
资金
- Xunta de Galicia [10TAL314003PR]
- Ministerio de Educacion y Ciencia [CTQ2006-13969-BQU]
- Universidad de Vigo
- Universidade do Porto
- Conselho de Reitores das Universidades Portuguesas (Accao Integrada Luso-Espanhola) [E40/08]
- National Science Foundation [CHE 0411990]
- Agriculture and Food Research Initiative from the USDA National Institute of Food and Agriculture [2009-02403]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [0840916] Funding Source: National Science Foundation
Antioxidant (AO) efficiencies are reported to go through maxima with increasing chain length (hydrophobicity) in emulsions. The so-called cutoff after the maxima, indicating a decrease in efficiency, remains unexplained. This paper shows, for gallic acid (GA) and propyl, octyl, and lauryl gallates (PG, OG, and LG, respectively), that at any given volume fraction of emulsifier, the concentrations of antioxidants in the interfacial region of stripped corn oil emulsions and their efficiency order follow PG > GA > OG > LG. These results provide clear evidence that an AO's efficiency correlates with its fraction in the interfacial region. AO distributions were obtained in intact emulsions by using the pseuclophase kinetic model to interpret changes in observed rate constants of the AOs with a chemical probe, and their efficiencies were measured by employing the Schaal oven test. The model provides a natural explanation for the maxima with increasing AO hydrophobicity.
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