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Structural and Emulsifying Properties of Soy Protein Isolate Subjected to Acid and Alkaline pH-Shifting Processes
Abstract
Structural unfolding of soy protein isolate (SPI) as induced by holding (0, 0.5, 1, 2, and 4 h) in acidic (pH 1.5-3.5) and alkaline (pH 10.0-12.0) pH solutions, followed by refolding (1 h) at pH 7.0, was analyzed. Changes in emulsifying properties of treated SPI were then examined. The pH-shifting treatments resulted in a substantial increase in protein surface hydrophobicity, intrinsic tryptophan fluorescence intensity, and disulfide-mediated aggregation, along with the exposure of tyrosine. After the pH-shifting processes, soy protein adopted a molten globule-like conformation that largely maintained the original secondary structure and overall compactness but lost some tertiary structure. These structural modifications, consequently, led to markedly improved emulsifying activity of SPI as well as the emulsion stability.
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Cited by
Karaca, A. C., Low, N., & Nickerson, M. (2011) · Food Research International · doi:10.1016/j.foodres.2011.06.012 · Cited by 871
Ursu, A.-V., Marcati, A., Sayd, T., Sante-Lhoutellier, V., Djelveh, G., & Michaud, P. (2014) · Bioresource Technology · doi:10.1016/j.biortech.2014.01.071 · Cited by 367
Functionality and structure of yellow pea protein isolate as affected by cultivars and extraction pH
Cui, L., Bandillo, N., Wang, Y., Ohm, J.-B., Chen, B., & Rao, J. (2020) · Food Hydrocolloids · doi:10.1016/j.foodhyd.2020.106008 · Cited by 293
Extraction and fractionation of microalgae-based protein products
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Metadata
- Authors
- Jiang, J., Chen, J., & Xiong, Y. L.
- Venue
- Journal of Agricultural and Food Chemistry
- Publisher
- American Chemical Society (ACS)
- Published
- 2009-07-14
- Volume
- 57
- Issue
- 16
- Pages
- 7576-7583
- ISSN
- 0021-8561 (ISSN-L)
- 1520-5118
- OpenAlex
- W2052924389
- Cited by
- 587
- References
- 0
- FWCI
- 9.64
- Type
- journal article
- Language
- en
- Open access
- closed
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- Jiang, J., Chen, J., & Xiong, Y. L. (2009). Structural and Emulsifying Properties of Soy Protein Isolate Subjected to Acid and Alkaline pH-Shifting Processes. Journal of Agricultural and Food Chemistry. https://doi.org/10.1021/jf901585n
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