## 3 Results and Discussion
### Analysis of Migration Tests by LC-MS\({}^{n}\)
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**TR (min)** & **n/z (Adduc) \({}^{\ast}\)** & **Product Ions** & **Proposed Compound** & **CT** & **Sample** \\ \hline
16.6, 17.4 & **584.3 (NH\({}_{4}^{+}\))**, 567.3 (H\({}^{+}\)), & & 2 PA+2 CHDM (L) & I & CM3 \\
18.8, 64.8 & **419.2 (H\({}^{+}\))**, 436.2 (NH\({}_{4}^{+}\)), & 201, 149 & PA+2 CHDM & I & CM2, CM3 \\
28.4 & 641.3 (Na\({}^{+}\))**, 657.3 (H\({}^{+}\)), & & 3 PA+NPG+2 EG (C) & III & CM2, CM3 \\
29.5 & **423.2 (Na\({}^{+}\))**, 401.2 (H\({}^{+}\)), & & 2 PA+NPG & I & CM2 \\
418.3 (NH\({}_{4}^{+}\))**, 439.2 (K\({}^{+}\)) & & & & & \\
35.5 & **385.1 (H\({}^{+}\))**, 407.1 (Na\({}^{+}\)), & & 193, 149, 341, 359 & 2 PA+2 EG (C) & III & CM2, CM3 \\
423.0 (K\({}^{+}\))**, 420.2 (NH\({}_{4}^{+}\)), & & & & & \\
39.7 & **425.2 (Na\({}^{+}\))**, 441.2 (K\({}^{+}\)), & & & & \\
420.2 (NH\({}_{4}^{+}\))**, 403.2 (H\({}^{+}\)) & & & & & \\
39.7 & 761.3 (H\({}^{+}\))**, 768.4 (NH\({}_{4}^{+}\)), & & & & \\
39.7 & 783.4 (Na\({}^{+}\))**, 799.3 (K\({}^{+}\)) & & & & \\
44.6 & 504.3 (NH\({}_{4}^{+}\))**, 509.3 (Na\({}^{+}\)), & & & & \\
525.2 (K\({}^{+}\))**, 487.3 (H\({}^{+}\))** & & & & & \\
51.6, 53.0 & **683.4 (Na\({}^{+}\))**, 678.3 (NH\({}_{4}^{+}\)), & & & & \\
699.3 (K\({}^{+}\))** & & & & & \\
60.8, 61.9 & **509.4 (H\({}^{+}\))**, 531.4 (Na\({}^{+}\))** & & & & \\
61.3 & **497.2 (H\({}^{+}\))**, 514.2 (NH\({}_{4}^{+}\)), & & 479, 415, 231, 149 & 2 PA+2 HD (C) & III & CM1 \\
62.5, 62.8 & **703.2 (H\({}^{+}\))**, 741.2 (K\({}^{+}\))** & & & & \\
62.7 & **781.5 (Na\({}^{+}\))**, 797.4 (K\({}^{+}\)), & & & & \\
776.4 & **704.4 (H\({}^{+}\))**, 797.4 (K\({}^{+}\)), & & & & \\
63.4, 64.0 & **917.2 (Na\({}^{+}\))** & & & & \\
63.6, 63.9 & **739.3 (Na\({}^{+}\))**, 755.2 (H\({}^{+}\))** & & & & \\
755.2 (Na\({}^{+}\))**, 785.2 (H\({}^{+}\))** & & & & & \\
64.4, 64.7 & 731.3 (H\({}^{+}\)), & & & & \\
731.3 (H\({}^{+}\))**, 769.2 (K\({}^{+}\))** & & & & & \\
65.2, 65.4 & **767.3 (Na\({}^{+}\))**, 782.3 (NH\({}_{4}^{+}\))** & & & & \\
65.2, 65.4 & **767.3 (Na\({}^{+}\))**, 783.2 (K\({}^{+}\))** & & & & \\
63.9 & **612.5 (NH\({}_{4}^{+}\))**, 617.5 (Na\({}^{+}\)), & & & & \\
63.4, 64.0 & 933.2 (K\({}^{+}\))**, 895.2 (H\({}^{+}\))** & & & & \\
63.6, 63.9 & **739.3 (Na\({}^{+}\))**, 734.3 (NH\({}_{4}^{+}\)), & & & & \\
755.2 (Na\({}^{+}\))**, 771.7 (H\({}^{+}\))** & & & & & \\
64.4, 64.7 & 753.3 (Na\({}^{+}\))**, 748.3 (NH\({}_{4}^{+}\)), & & & & \\
731.3 (H\({}^{+}\))**, 769.2 (K\({}^{+}\))** & & & & & \\
65.2, 65.4 & **767.3 (Na\({}^{+}\))**, 782.3 (NH\({}_{4}^{+}\))** & & & & \\
65.2, 65.4 & **745.3 (H\({}^{+}\))**, 783.2 (K\({}^{+}\))** & & & & \\
63.9 & **612.5 (NH\({}_{4}^{+}\))**, 617.5 (Na\({}^{+}\)), & & & & \\
63.4 (K\({}^{+}\))** & & & & & \\
64.8 & 743.3 (H\({}^{+}\))**, 760.3 (NH\({}_{4}^{+}\)), & & & & \\
765.3 (Na\({}^{+}\))**, 781.2 (K\({}^{+}\))** & & & & & \\ \hline \hline \end{tabular} \({}^{\ast}\) The adduct with the highest intensity is highlighted in bold text; CT: Cramer toxicity; L: linear; C: cyclic.  
\end{table} 
Table 4: Tentatively identified polyester oligomers by LC-MS\({}^{\rm n}\). using different isomers of starting substances (PA, IPA, TPA) or from oligomers having the same composition but different structures, taking into account that the position of acids and alcohols cannot be differentiated [5]. These results are in line with those reported by other authors. For example, two of them (2 PA+CHDM and 2 PA+2 CHDM) were also detected in the extracts of the polyester can coatings analyzed by [PERSON] et al. [8], while four of them (2 TPA+2 HD, 2 PA+2 NPG, 2 PA+NPG+HD, and 3 PA+3 HD) could be quantified in one of the resins examined by [PERSON] et al. [38], which had the same starting monomers as the one assumed for our samples. [PERSON] et al. [65] analyzed two different polyester-polyurethane lacquers and predicted a total of twenty-eight oligomer combinations, of which eleven coincided with those identified in our samples. In agreement with the study carried out by [PERSON] et al.