Journal
FOOD HYDROCOLLOIDS
Volume 31, Issue 2, Pages 435-437Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodhyd.2012.11.017
Keywords
Fourier transform infrared (FTIR) spectroscopy; Soy proteins; Reverse micelles; Conformation
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Funding
- Science AMP
- Technology Development Planning of Shandong Province of China [2011GGC02044]
- Promotive Research Fund for Excellent Young and Middle-aged Scientists of Shandong Province of China [BS2010NY027]
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Fourier transform infrared (FTIR) method was used to study the conformations of soy protein obtained through aqueous solution and bis(2-ethylhexyl) sodium sulfosuccinate (AOT) reverse micelle extraction. The results showed that there were changes in signal intensity and/or position of IR bands at 4000 -400 cm(-1) when the soy proteins were separated by two extraction methods. The FTIR spectral changes were subsequently assessed using the second derivative spectroscopy in the amide I region (1700-1600 cm(-1)). The contents of alpha-helix, beta-sheet, turn and irregular conformations for soy proteins using aqueous solution extraction were 11.6%, 32.8%, 44.3% and 11.3%, respectively; while using AOT reverse micelle extraction 13.1%, 41.6%, 32.5% and 12.9%, respectively. The amount change of these structures might affect functional properties of soy proteins. (C) 2012 Elsevier Ltd. All rights reserved.
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