Skatole and Indole are examples of which group?

• A. Ptomaines
• B. End products
• C. Gases
• D. Odorants

Answer: (A)

When bacteria break down proteins during putrefaction, they produce nitrogen-containing compounds known as ptomaines. Indole and skatole are classic examples of these ptomaines; they arise from the bacterial metabolism of amino acids like tryptophan and have strong, characteristic odors. This classification is more precise than just calling them odorants or end products, since it reflects their origin as nitrogenous bases formed during putrefaction. While they do contribute to odor, labeling them as ptomaines specifically identifies their biochemical source and nature.