Syn-Propanethial-S-oxide

Syn-Propanethial-S-oxide is a chemical compound that acts as a lachrymatory agent, which is a substance that stimulates the eyes to produce tears. It is most commonly known for being the compound released when an onion is cut, causing the eyes to tear up.

Chemical Properties

Syn-Propanethial-S-oxide is a volatile compound, meaning it readily evaporates at room temperature. This allows it to quickly reach the eyes and stimulate the tear glands. It is a clear, colorless liquid with a strong, pungent odor.

Biological Effects

When syn-Propanethial-S-oxide comes into contact with the eyes, it stimulates the sensory neurons in the cornea, causing a stinging sensation and the production of tears. This is a protective response, as the tears help to wash away the irritating compound.

Production

Syn-Propanethial-S-oxide is produced when an onion is cut or crushed. The action damages the cells of the onion, releasing enzymes that break down amino acids in the onion to produce syn-Propanethial-S-oxide.

Prevention of Eye Irritation

There are several methods to prevent eye irritation when cutting onions. These include chilling the onion before cutting, cutting under running water, or using a sharp knife to reduce cell damage and thus the amount of syn-Propanethial-S-oxide produced.

See Also

• Lachrymatory agent
• Onion
• Chemical compound
• Volatile compound
• Cornea
• Amino acids