Impact of microencapsulation within electrosprayed proteins on the formulation of green tea extract-enriched biscuits

In this work, a green tea extract (GTE) was encapsulated within electrosprayed protein (i.e. gelatin and zein) microparticles, and the protective ability of both systems on the green tea catechins was assessed. The microparticles (with encapsulation efficiencies similar to 90 g/100 g), proved to be very effective in stabilizing the catechins during a thermal treatment at 180 degrees C (12 min), preserving 85-90 g/100 g of their initial catechins content, while free GTE lost almost 40 g/100 g of its catechins content. In order to assess the impact of microencapsulation in a real food system, the GTE-loaded electrosprayed microparticles were added to biscuits dough. Results showed that microencapsulation did not significantly protect during biscuit processing and emphasized the need of assessing the behaviour of microencapsulation systems in real food processing conditions. The sensorial analysis of the biscuits indicated that addition of the GTE loaded microparticles did not impact the acceptability of the biscuits, as perceived by consumers. (C) 2017 Elsevier Ltd. All rights reserved.