Figure 8. Ninhydrin reaction with the reaction mixtures of hydrolyzed chitin and cicada shells in 6 M HCl at 110 C.

From

Cicada Shells as Chemical Education Resources to Study Functional Groups and Environmental Cycles

Naoki Maruyama, Toratane Munegumi

World Journal of Chemical Education. 2023, 11(4), 127-133 doi:10.12691/wjce-11-4-1