Which sulfur-containing compound causes asparagus's characteristic pungent odor?
Answer
Asparagusic acid
The unique, characteristic, and often pungent odor associated with asparagus consumption occurs after its metabolism within the human body, and this effect is specifically attributed to asparagusic acid. Asparagusic acid is described as a sulfur-containing compound that features a notable 1,2-dithiolane ring system in its chemical structure. When this acid is broken down during biological processing, it yields volatile sulfurous byproducts that are responsible for the distinct smell detected upon urination. This compound is chemically distinct from other sulfur-containing components or antioxidant flavonoids mentioned, such as asparaptine or quercetin.
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