Methylmercaptan

Methylmercaptan, also known as methanethiol, is a colorless gas with a distinctive smell. It is a natural substance found in the blood, brain, and other tissues of people and animals. It is also released from animal feces. It occurs naturally in certain foods, such as some nuts and cheese. It is also a by-product of certain metabolic processes. Its chemical formula is CH3SH.

Chemical Properties

Methylmercaptan is a thiol. The thiol group, also known as mercaptan, is a functional group composed of a sulfur atom and a hydrogen atom (-SH). Being a thiol, methylmercaptan is often used as a strong reducing agent. It is less dense than air and can easily be ignited. Its boiling point is 6 degrees Celsius (43 degrees Fahrenheit).

Biological Significance

In humans and animals, methylmercaptan is a by-product of the metabolism of methionine, an essential amino acid. It is released from the body through feces, and to a lesser extent through urine. It is one of the main chemicals responsible for bad breath and the smell of flatus. High levels of methylmercaptan in the breath can be a sign of halitosis or certain gastrointestinal diseases.

Industrial Uses

Methylmercaptan is used in the production of pesticides, jet fuel, and plastic. It is also used as a gas odorant, because its strong smell enables it to be detected in the event of a gas leak.

Health Effects

Exposure to methylmercaptan can cause irritation to the skin, eyes, and respiratory system. It can also cause headache, dizziness, nausea, and vomiting. In severe cases, it can cause unconsciousness and even death.

See Also

• Thiol
• Methionine
• Halitosis
• Gastrointestinal diseases