Figure 2.

Example of statistical deconvolution on the coelution of artemisinin and 4′-bromoflavone. (A) sum of all 80 ¹H-NMR spectra; (B) sum of all 80 ¹H-NMR spectra of fractions G9 to H10; (C) correlation ¹H-NMR pseudospectrum, corresponding to feature RT = 2.18 min and m/z = 283.1566 (PI)—artemisinin as [M + H]⁺ adduct; (D) filtered ¹H-NMR pseudospectrum corresponding to feature RT = 2.18 min and m/z = 283.1566 (PI)—artemisinin as [M + H]⁺ adduct; (E) filtered ¹H-NMR pseudospectrum corresponding to feature RT = 2.37 min and m/z = 300.9882 (PI)—4′-bromoflavone as [M + H]⁺ adduct; red crosses ($+$) highlight chemical shifts detected for pure artemisinin; blue diamonds ($♦$) highlight chemical shifts detected for pure 4′-bromoflavone.