As early as 1811 AD, it was discovered by the French scholar Bracono, who isolated chitin from mushrooms and named it "fungi", meaning fungal products

In 1823, Odier discovered a fungus-like substance from the hard parts of crustacean skin and named its chitin. Meaning of "Covering Substance"

Finally, in 1894, the scholar Hoppe-Seyler converted part or all of this deacetylation into chitin with free amino groups, called chitosan or chitosan.