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,"
Food Structure: Vol. 6
, Article 13.
Available at: http://digitalcommons.usu.edu/foodmicrostructure/vol6/iss2/13