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. 2022 Oct 20;11(10):2069. doi: 10.3390/antiox11102069

Figure 2.

Figure 2

Figure 2

Second derivative infrared spectra (by the Savitzky–Golay polynomial fitting method, 25-point smoothing) of DCM extract range 400–2000 cm−1 (a), DCM extract range 2000–4000 cm−1 (b), Ace extract range 400–2000 cm−1 (c), Ace extract range 2000–4000 cm−1 (d), MeOH extract range 400–2000 cm−1 (e), MeOH extract range 2000–4000 cm−1 (f), MeOH-H2O extract range 400–2000 cm−1 (g), MeOH-H2O extract range 2000–4000 cm−1 (h), H2O extract range 400–2000 cm−1 (i), H2O extract range 2000–4000 cm−1 (j); (black line) juxtaposed with the spectra of caperatic acid (red line), atranorin (blue line) and methyl β-orcinolcarboxylate (green line).