Journal
FOOD HYDROCOLLOIDS
Volume 70, Issue -, Pages 211-218Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodhyd.2017.04.003
Keywords
Pickering foam; Bacteria; Sodium caseinate; beta-casein; Complex structures; Self-assembling
Categories
Funding
- People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme FP7 [606713]
- Swedish Research Council [2013-4171]
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We report the preparation and characterization of aqueous Pickering foams using bio-particles constituted by lactic acid bacteria surface modified by oppositely charged milk proteins. Cell surface modification was shown by zeta potential measurements. Foams stabilized by bacterial Pickering bio-particles showed improved stability compared to purely milk protein stabilized foams. The stability of foams increased with the bacterial concentration whereas the foam volume (foamability) decreased. On the other hand, protein concentration was correlated with foamability but not with the foam stability. Optical and fluorescence microscopy revealed organized cell structures around and in between the air bubbles providing for an internal network that effectively stabilizes the foam. Therefore, entirely food grade stable foams can be produced by using modified health promoting bacterial cells and surface active milk proteins. Such Pickering systems can potentially be utilized in bottom up construction of more complex hierarchical food structures and further improve properties such as foam stability. (C) 2017 Elsevier Ltd. All rights reserved.
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