Although
human pathogens such as L. monocytogenes are not considered
spoilage organisms, they will use food substrates to provide their
metabolic needs, breaking down sugars and carbohydrates first,
then proteins. This breakdown process of food molecules by the
microorganisms induces production of VOCs such us alcohols, ketones,
hydrocarbons, esters, and amines that are likely
specific both to the bacterium and the substrate.