Nicotinamides

Part of speech: noun

Definitions

1. A class of compounds derived from niacin that play essential roles in cellular metabolism and function
2. Organic molecules related to vitamin B3, involved in various biochemical pathways, including energy production and DNA repair
3. Important derivatives of nicotinic acid, serving as precursors to coenzymes that facilitate numerous metabolic reactions in the body

Etymology: "Nicotinamides" is simply the plural of "nicotinamide," the name for one of the forms of vitamin B3. The surprising part is the name itself: it is a blend of "nicotine" and "amide," even though the vitamin has nothing to do with the tobacco alkaloid that shares its first half. The connection is structural. The vitamin's core is a pyridine ring carrying a carboxamide group, and chemists in the early twentieth century named it after nicotinic acid, a compound they had derived from nicotine by oxidation. That acid, the form of the vitamin the name points back to, got its name from the tobacco alkaloid it was made from. The "-amide" ending is a standard chemical suffix, marking a compound in which an amine group is bonded to a carbonyl group. Put together, the name records a chain of chemical relationships rather than any biological one: nicotine, the source of the parent acid, then the amide group that defines the vitamin's form.