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Table 3 Analysis of the extracted components from the reddish pigments

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

RT (min) Measured value (m/z) Theoretical value (m/z) Formula and compound High energy fragment ions Collision energy (eV) MS/MS fragment ions
3.191 303.0866 303.0869 C16H16O6 Protosappanin B 243.0229\213.0493\109.0250 20–40 270.0533\243.0548\231.0620\213.0493\185.0561\159.0414\109.0207
3.254 285.0701 285.0763 C16H14O5 Brazilin 267.0331\243.0357\163.0434\121.0280 15–25 267.0598\243.0261\197.1108\163.0355\135.0415\121.0257
3.889 283.0579 283.0606 C16H12O5 Brazilein 265.0424\241.0445\109.0250 20–40 265.0457\241.0350\240.0377\196.0456\173.0529\109.0207