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Heritage Science
Fig. 8 | Heritage Science

Fig. 8

From: Scientific analysis of tie luo, a Qing Dynasty calligraphy artifact in the Palace Museum, Beijing, China

Fig. 8

UPLC-Q-TOF chromatograms of the extracts of reddish pigments (I) and sappanwood (II). MS/MS spectra of the compound m/z 303 and m/z 285 as well as m/z 283 eluted in the UPLC peak 3.191 and 3.254 min as well as 3.889 min respectively in a, d, g reddish pigment extract; b, e, h sappanwood extract; c standard protosappanin B; f standard brazilin; i standard brazilein

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