Table 2 Shifts in absorption and emission bands of the liquid sample, cured film, ethanol extract and the oil film after ethanol extraction, as well as the two purified HPLC fractions in methanol
From: Insights into the yellowing of drying oils using fluorescence spectroscopy
Absorption band maximum; λex (nm) | Emission band maximum; λem (nm) | Stokes shift; ∆(nm) | |
|---|---|---|---|
Liquid | 207 | – | – |
236 | – | – | |
283 | – | – | |
300 | 329, 412 | 29, 112 | |
315 | 412 | 97 | |
Cured oil film | 300 | 445 → 550* | 145 → 250* |
Ethanol extract from cured oil | 318 | 418 | 100 |
Cured oil film after ethanol extraction | – | 445 | – |
Fraction 1 | 232 | – | – |
275 | 315 | 40 | |
Fraction 2 | 275 | 315 | 40 |