Abstract
Heat treatment and mechanical movement are the most common stressors that affect food material processing. A w/o/w emulsion is a promising system for delivering sensitive materials in food products and in reducing dietary fat content, but for wider uses, it is necessary to evaluate emulsion behaviour during food manufacturing. In the present study, we simulate heat (5 to 85 °C) and mechanical processes (shear rate 0.1 to 1000 s−1) using rotational rheometry and describe changes in glucose encapsulation efficiency and droplet size of model w/o/w 20% emulsions prepared with 2.5 wt % PGPR (polyglycerol polyricinoleate) as lipophilic emulsifier in canola oil (oil phase) and distilled water or 10 wt % skim milk as an internal water phase stabilized or not by 3 types of carrageenan (0.5 wt %) and milk proteins as emulsifier. The comparison of w/o/w emulsions prepared with three specific types of carrageenan provides the important information on the suitability of the combination of specific carrageenan and internal water phase. It was found that model manufacturing did not influence the result encapsulation efficiency of all w/o/w emulsions significantly. We demonstrated that model w/o/w 20% emulsions were sufficiently stable for manufacturing, especially when skim milk was used with 0.5 wt % kappa carrageenan as the internal water phase. These samples subjected to manufacturing showed an encapsulation efficiency 53.97 ± 0.00% even after 4 weeks storage at 4 °C and droplet size (D[4, 3]) 39.04 ± 1.56 µm. So prepared w/o/w emulsions provided the demanded stability and could be part of functional food.
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We thank John Brooker for English revision.
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This research project was financially supported by Technology Agency of the Czech Republic (TACR), project TJ04000443.
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IK (main author and corresponding author) made substantial contributions to conception and design of the study, analysis and interpretation of data, drafted manuscript. MK (co-author) made substantial contributions to conception and design of the study, acquisition of data, or analysis and interpretation of data, drafted the article. KV (co-author) made substantial contributions to conception and design of the study, acquisition of data, or analysis and interpretation of data. ŠH (co-author) made substantial contributions to conception and design of the study, acquisition of data, or analysis and interpretation of data, drafted the article. MB (co-author) made substantial contributions to conception and design of the study, acquisition of data, or analysis and interpretation of data. JŠ (co-author) reviewed the manuscript critically for important intellectual content, gave final approval of the version to be published.
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Klojdová, I., Kumherová, M., Veselá, K. et al. The influence of heat and mechanical stress on encapsulation efficiency and droplet size of w/o/w multiple emulsions. Eur Food Res Technol 248, 2303–2309 (2022). https://doi.org/10.1007/s00217-022-04046-3
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DOI: https://doi.org/10.1007/s00217-022-04046-3