Figure 5

EEL spectra of shrimp shells during different stages of biological chitin purification. a) Exocuticle of untreated P. monodon shrimp shells, b) Endocuticle of P. monodon shrimp shells after deproteination when protein (nitrogen) was largely removed and c) Shrimp shells after demineralization when calcium was removed. CaL1, CaL2, CaL3 and NK represent energy loss intensities from electron shells of respective elements.