Table 2 List of compounds identified in the archeological textiles by UPLC-PDA-MS (negative ion mode)
From: Chemical evidence for the spread of lac colorant in Xinjiang from the 2nd to 9th centuries CE
Samples | Peak no. | Possible compounds | Chemical formula | Calculated mass [M-H]- | Experimental mass [M-H]- |
|---|---|---|---|---|---|
Y1 | 1 | Laccaic acid A | C26H19NO12 | 536.08 | 536.00 |
2 | Laccaic acid B | C24H16O12 | 495.06 | 494.99 | |
3 | Laccaic acid C | C25H17NO13 | 538.06 | 538.02 | |
4 | Laccaic acid E | C24H17NO11 | 494.07 | 494.03 | |
A4 | 1 | Laccaic acid A | C26H19NO12 | 536.08 | 536.05 |
2 | Laccaic acid B | C24H16O12 | 495.06 | 494.99 | |
3 | Laccaic acid C | C25H17NO13 | 538.06 | 538.06 | |
4 | Laccaic acid E | C24H17NO11 | 494.07 | 494.07 | |
MR1 | 1 | Laccaic acid A | C26H19NO12 | 536.08 | 536.05 |
2 | Laccaic acid B | C24H16O12 | 495.06 | 494.98 | |
3 | Laccaic acid C | C25H17NO13 | 538.06 | 538.06 | |
4 | Laccaic acid E | C24H17NO11 | 494.07 | 494.05 | |
MC1 | 1 | Laccaic acid A | C26H19NO12 | 536.08 | 536.02 |
2 | Laccaic acid B | C24H16O12 | 495.06 | 495.06 | |
3 | Laccaic acid C | C25H17NO13 | 538.06 | 538.06 | |
4 | Laccaic acid E | C24H17NO11 | 494.07 | 494.05 |
