Journal
FOOD CHEMISTRY
Volume 188, Issue -, Pages 24-29Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2015.04.127
Keywords
Quercetin; Soy protein isolate; Fluorescence; Stability; Antioxidant
Funding
- National Natural Science Foundation of China [21173081]
- Fundamental Research Funds for the Central Universities [WK1213003]
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This work is to study the potential of particles fabricated from soy protein isolate (SPI) as a protective carrier for quercetin. When the concentration of SPI particles increases from 0 to 0.35 g/L, quercetin gives a gradually increased fluorescence intensity and fluorescence anisotropy. The addition of quercetin can highly quench the intrinsic fluorescence of SPI particles. These results are explained in terms of the binding of quercetin to the hydrophobic pockets of SPI particles mainly through the hydrophobic force together with the hydrogen bonding. The small difference in the binding constants at 25 and 40 degrees C suggests the structural stability of SPI particles. The relative changes in values of Gibbs energy, enthalpy, and entropy indicate that the binding of quercetin with SPI particles is spontaneous and hydrophobic interaction is the major force. Furthermore, SPI particles are superior to native SPI for improving the stability and radical scavenging activity of quercetin. (C) 2015 Elsevier Ltd. All rights reserved.
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