Monosaccharide

Monosaccharides, also called simple sugars, are a type of organic compound important for life. They usually have the formula (CH₂O)_x and contain two or more carbon-carbon bonds. Monosaccharides can be aldehydes or ketones, and they are grouped by the number of carbon atoms they contain, such as triose (3 carbons), tetrose (4 carbons), pentose (5 carbons), hexose (6 carbons), and so on.

These sugars are colorless, water-soluble, and crystalline solids, and most of them taste sweet. Common examples include glucose, fructose, and galactose. Monosaccharides are the building blocks of larger sugar molecules called disaccharides, like sucrose (table sugar), and polysaccharides, such as cellulose and starch.

Glucose, a type of monosaccharide, helps provide energy to living organisms. It is important for processes that give us energy from food. Understanding monosaccharides helps us learn about how food gives us energy and how our bodies use it.

Structure and nomenclature

Monosaccharides are simple sugars made of a straight chain of carbon atoms. Most have the same basic chemical formula, (CH₂O)_x, where x is a number of 3 or more. For example, glucose, which gives us energy, is a hexose with six carbons. Ribose, found in RNA, is a pentose with five carbons.

These sugars can be either aldoses, with an aldehyde group at one end, or ketoses, with a ketone group inside the chain. Their atom arrangements let them form different shapes and play special roles in living things.

Derivatives

Many important changed monosaccharides are used in living things. These include amino sugars such as galactosamine, glucosamine, sialic acid, and N-acetylglucosamine. There are also sulfosugars like sulfoquinovose, and other compounds such as ascorbic acid, mannitol, and glucuronic acid. These changed sugars help in many ways in the body and nature.