Table 2 Historical samples—synthetic dye
Sample code | Dye compounds: (M: major compound) (m: minor compound) | Relative ratio of peak areas of detected spectra at 255 nm | Chemical structure |
|---|---|---|---|
A1 | S1 (Rt:22.1 min) | 100% S1 |
|
A2 | S1 (Rt:22.1 min) | 100% S1 | |
A3 | S2 (Rt:16.9 min) (M)–S1 (Rt:22.1 min) (m) | 66% S2, 4% S2’, 30% S1 | |
C1 | S1 double peak (Rt:21.6 min–Rt:22.1 min) | 67–33% S1–S1 | |
C2 | S1 double peak (Rt:21.6 min–Rt:22.1 min) (M) S2 (Rt:16.9 min) (m) | 12% S2, 64–24% S1–S1 | |
D1 | S2 (Rt:16.9 min) | 100% S2 | |
E1 | S1 (Rt:21.5 min) | 100% S1 | |
E2 | S2 (Rt:16.9 min) | 100% S2 | |
F1 | S1 double peak (Rt:21.4 min–Rt:21.9 min) (M), S1’ (Rt:21–Rt:22.8 min) (m), S2 (Rt:16.9 min) (m) | 4% S2, 5% S1’, 64–27% S1–S1, 1% S1’ | |
F2 | S1 double peak (Rt:21.4 min–Rt:21.9 min) (M), S1’ (Rt:21–Rt:22.8 min) (m), S2 (Rt:16.9 min) (m) | 4% S2, 5% S1’, 57–30% S1–S1, 3% S1’ | |
F3 | S2 (Rt:16.9) (M), S2’ (Rt:18.6 min) (m), S1 double peak (Rt:21.4 min–Rt:21.9 min) (m), S1’ (Rt:21–Rt:22.8 min) (m) | 69% S2, 6% S2’, 1% S1’, 16–8% S1–S1 | |
F4 | S2 (16.9 min) (M), S2’ (Rt:18.6 min) (m), S1 double peak (Rt:21.4 min–Rt:21.9 min) (m) | 82% S2, 6% S2’, 9–2% S1–S1 | |
G1 | S1 double peak (Rt:21.4–Rt:21.9 min) | 80–20% S1–S1 | |
G2 | S1 double peak (Rt:21.4–Rt:21.9 min) | 74–26% S1–S1 |
