Chondrin

Chondrin, a substance containing oxygen, hydrogen, nitrogen, and sulphur, but of unknown composition, which is obtained from cartilage by extraction with boiling water. It is uncertain, however, whether it really exists as such in the cartilaginous tissue. It resembles gelatine in many respects, dissolving if boiled with water, and gelatinising on cooling. Boiled with hydrochloric acid it yields a fermentable sugar.