lotaustralin

Lotaustralin is a cyanogenic glucoside found in some plants, notably in certain species of the genera Lotus and Trifolium. Cyanogenic glucosides are compounds that can release hydrogen cyanide (HCN) when the plant tissue is damaged, such as by chewing or during digestion. This release of cyanide is a defense mechanism against herbivores.

The structure of lotaustralin is similar to linamarin, another well-known cyanogenic glucoside. Lotaustralin consists of a glucose molecule linked to a cyanohydrin derived from acetone. When the plant material containing lotaustralin is bruised or broken, enzymes within the plant, specifically beta-glucosidases, hydrolyze the glycosidic bond. This process liberates glucose and a cyanohydrin intermediate. The cyanohydrin then spontaneously decomposes to produce hydrogen cyanide and a ketone (in this case, acetone).

The presence of lotaustralin in plants can pose a toxicity risk to livestock and, in some cases, to humans if consumed in significant quantities without proper processing. Cyanide poisoning can affect cellular respiration, leading to rapid and severe symptoms. However, many traditional food preparation methods, such as boiling or fermentation, can reduce or eliminate the cyanide content by inactivating the enzymes and allowing the volatile hydrogen cyanide to escape. The concentration of lotaustralin can vary greatly depending on the plant species, cultivar, growing conditions, and plant part.