Glossary

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Lignin

Organic substance stored in plant cell walls resulting in lignification (wood)

Lignin is an aromatic hydrocarbon compound forming a three-dimensional structural matrix. Lignified cells occur in tough or woody plants like grasses, perennial herbs, trees, and shrubs. After cellulose, lignin is the second most common organic substance on Earth.

Lignin is unfavourable for paper production as it contributes to yellowing. Therefore, lignin is chemically removed from paper pulp and is used for other purposes such as fuel, as a binding agent in animal feed and adhesives, or as raw material for the production of vanillin (a flavour).

Different kinds of livestock respond differently to food containing lignin. Cattle digest lignin well, while chickens have a much harder time.

In foods, lignin is considered dietary fibre. There is evidence that lignin binds to carcinogens and other harmful substances and makes them safe.