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Influence of glycation on microencapsulating properties of soy protein isolate–lactose blends

Authors

  • Xin-Rong Li,

    1. Department of Food Science and Technology and KLGPNPS, South China University of Technology, Guangzhou, People's Republic of China
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  • Chuan-He Tang

    Corresponding author
    1. State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, People's Republic of China
    • Department of Food Science and Technology and KLGPNPS, South China University of Technology, Guangzhou, People's Republic of China
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Correspondence to: Chuan-He Tang, Department of Food Science and Technology, South China University of Technology, Guangzhou 510640, People's Republic of China. E-mail: chtang@scut.edu.cn

Abstract

Background

There is increasing interest in developing encapsulating materials from vegetable proteins as an abundant alternative for animal proteins or petroleum-derived polymers. Relationships between emulsifying and microencapsulating properties of soy protein isolate or blends with carbohydrates have not been well characterised. The influence of glycation between soy protein isolate and lactose prior to emulsification on the emulsifying and microencapsulation properties of their blends was investigated in this work.

Results

Analysis of the emulsion characteristics indicated that the glycation resulted in a decreased size of emulsion droplets, enhanced emulsion stability, and decreased apparent viscosity, suggesting improvement of emulsifying properties. In the spray-dried emulsions, the treatment with increasing degree of glycation from 0 to 13% progressively increased the retention efficiency from 96.4 to 98.3%. The glycation with an appropriate degree of glycation significantly decreased mean droplet size of the reconstituted emulsions, and increased the dissolution rate and capacity. However, the storage stability of the powders at 75% relative humidity was decreased by the glycation, though to a limited extent.

Conclusion

Glycation improves the encapsulation efficiency, redispersion and dissolution properties of soy protein isolate–lactose blends, but slightly accelerated the storage instability of the spray-dried emulsions. The improvement of microencapsulation properties has been related to that of the emulsifying properties. © 2013 Society of Chemical Industry

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