Fig. 5.

The process of incorporating microcapsules into dough. a), b) optical and fluorescent imaging of the vitamin D (dyed with Nile red) microcapsules embedded into dough by hand kneading; c), d) optical and fluorescent imaging of free vitamin D embedded into dough by hand kneading, fluorescent imaging insets present sample microstructures under machine kneading (scale bar is 50 µm); e) recovery of encapsulated vitamin D and free vitamin D, which extracted from the cooked dough. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)