Muffin images clearly revealed differences among crumb muffins samples, mainly related to shape, crumb porosity, crumb colour and degree of collapse on surface of muffins by effect of type of protein added (Fig. 7). Great variation in the appearance of the crumb structure between the samples was observed. No-Protein and VWG containing muffin showed denser matrix, indicating more compact crumb than other muffins samples. Contrarily, muffins containing EWP and C protein showed higher number of air bubbles than No-Protein, showing more spongy and light structure. Addition of casein produced muffins with stable network structure with homogeneous air cell but showed higher degree of collapse on surface, in addition these muffins showed a soft and humid appearance. SPI and PPI muffins did not show collapse during baking, but presented compact crumb.products.