In previous studies (Ledesma et al., 2015), a higher degree of
porosity was found in natural casings (66.84%) than in synthetic
casings (16.63%). The wrinkled morphology of natural casing is
more able to capture particles than synthetic casing. The fat content
in chorizos flows through the natural casings, covering their
external surface and making it sticky and wet. Soot particles slowly
penetrate the internal parts of these meat products and migrate to
the interior, preferentially through the lumps of fat.
Finally, it can be stated that raw chorizo mass is full of cavities
before smoking. During smoking, soot particles pass through the
pores in natural casing. They can then pass through cavities in the
raw ingredients and reach the internal parts of the product. At the
same time, water exits the chorizo through these cavities, raw ingredients
blend together and possible soot particles can be