Table 3 Historical samples—natural dye
Sample code | Dye compounds: (M: major compound) (m: minor compound) | Relative ratio of peak areas of detected spectra at 255 nm | Chemical structure |
|---|---|---|---|
B1 | Alizarin (M), purpurin (m), nordamnacanthal (m) | 3% luteolin-7-O-glucoside, 92% alizarin, 3% purpurin, 2% nordamnacanthal |
|
Luteolin-7-O-glucoside (m) | |||
B2 | Alizarin (M), purpurin (m), nordamnacanthal (m) | 87% alizarin, 10% purpurin, 2% nordamnacanthal | |
B3 | Alizarin (M), purpurin (m) | 91% alizarin, 9% purpurin | |
D2 | Alizarin (M), purpurin (m) | 85% alizarin, 15% purpurin |
