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. 2021 Oct 11;6(42):27781–27790. doi: 10.1021/acsomega.1c03285

Figure 4.

Figure 4

Raman spectra (background subtracted) of powder resulted from blue carapace showing the carotenoid preservation in both powdered samples in the case of Raman excitation with the 532 nm laser line (a) due to the resonance Raman effect selectively detecting carotenoids, while the carbonate signal only is detected under near-infrared laser excitation at 785 nm (b).