Journal
FOOD CHEMISTRY
Volume 240, Issue -, Pages 1005-1013Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2017.07.077
Keywords
Soybean protein isolate; beta-Conglycinin; Glycinin; Nanoemulsions; Ultra-high pressure homogenization; Storage stability
Funding
- Mississippi Agricultural and Forestry Experiment Station [MIS 501170]
- USDA-ARS SCA [58-402-2729]
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This study investigated the effects of the ultrahigh pressure homogenization (pressure, protein concentration, oil phase fraction, pH, temperature, and ionic strength) and storage on the properties of nanoemulsions (100-500 nm range), which were stabilized by laboratory-prepared soybean protein isolate (SPI), beta-conglycinin (7S) and glycinin (11S). The nanoemulsions made with SPI, 7S and 11S proteins exhibited considerable stability over various ionic strengths (0-500 mM NaCl), pH (<4 or >7), thermal treatments (30-60 degrees C) and storage (0-45 days). The far-UV spectra of SPI, 7S, 11S dispersions, and SPI-,7S-, 11S protein-stabilized nanoemulsions were analyzed for the protein structural changes following lipid removal. The ultra-high pressure homogenization changed the secondary structure of SPI, 7S, 11S proteins in the nanoemulsions, and enhanced their stability. This study demonstrated that SPI, 7S, and 11S proteins can be used as effective emulsifiers in nanoemulsions prepared by ultra-high pressure homogenization. (C) 2017 Published by Elsevier Ltd.
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