Coffee bean such fatty acids – 3-methyl-valeric acid (sour, green-herbaceous, unpleasant odor), acetaldehyde (pungent-nauseating odor, even when highly diluted, present in dried green coffee beans at concentrations of about 5 mg/kg), propanal (choking effect on respiratory system, penetrating-nauseating), butanal (nauseating effect, present in dried green coffee beans at 2 to 7 mg/kg), or pentanal (very repulsive nauseating effect). Coffee bean A coffee bean is a seed of the coffee plant and the source for coffee. It is the pit inside the red or purple fruit often referred to as a cherry. Just like ordinary cherries, the coffee fruit is also a so-called
Coffee State (now the Democratic Republic of the Congo) to Brussels to Java around 1900. From Java, further breeding resulted in the establishment of robusta plantations in many countries. In particular, the spread of the devastating coffee leaf rust ("Hemileia vastatrix"), to which "C. arabica" is vulnerable, hastened the uptake of the resistant robusta. "Hemileia vastatrix" is a fungal pathogen and results in light, rust-colored spots on the undersides of coffee plant leaves. "Hemileia vastatrix" grows exclusively on the leaves of coffee pants. Coffee leaf rust is found in virtually all countries that produce coffee. Mycena citricolor is another threat to