Transmission electron microscopy was used to observe structures within the air cell wall of a corn-based extrudate. Modified fixation and embedding techniques were employed to obtain optimum thin sections. Photomicrographs from these sections showed minute air cells measuring approximately 5 um or less. The size of air cells might impose a limiting factor on the infusion of particulate materials throughout the extrudate matrix.
Cohen, Samuel H. and Voyle, Charles A.
"Internal Porosity of Corn Extrudate Air Cell Wall,"
2, Article 13.
Available at: http://digitalcommons.usu.edu/foodmicrostructure/vol6/iss2/13