## 3 Results and Discussion
### GC Analysis
#### 3.2.2 Semi-Volatile Compounds by GC-MS
\begin{table}
\begin{tabular}{c c c c c c c c} \hline
**TR (min)** & **CAS N\({}^{\star}\)** & **Compound** & \(m/z\) & **SI** & **RSI** & **CM1** & **CM2** & **CM3** \\ \hline
25.00 & Unknown (alkane structure) & 43, 57, 71, 85 & & & & & X \\
25.42 & 77-90-7 & Acetyltrbutyl citrate (ATBC) \({}^{\star}\) & 129, 185, 259 & 771 & 901 & X & \\
25.63 & Unknown (acetophenone structure) & 77, 91, 119, 147 & 861 & 906 & X & \\
25.72 & Unknown (benzoic acid structure) & 77, 105 & 735 & 892 & & X & \\
25.97 & Unknown (sophthalic acid structure) & 82, 149, 167, 205 & & & & X & \\
26.15 & Unknown compound (octadec acid structure) & 55, 69, 85, 97 & 779 & 790 & X & & \\
26.17 & Unknown (phenol structure) & 121, 227, 256 & & & & X & \\
26.45 & 1235-74-1 & Methyl dehydrobiatte & 239, 299 & 700 & 711 & X & & \\
26.78 & 103-23-1 & Bis(2-ethyleyn) adipate (DEHA) \({}^{\star}\) & 57, 70, 111, 129 & 750 & 943 & X & & \\
26.89 & Unknown (alkane structure) & 57, 71, 85 & & & & & X \\
26.96 & 115-86-6 & Triphenyl phosphate & 77, 94, 326 & 752 & 908 & X & \\
27.57 & 10546-70-0 & n-propylbenzamideamide & 77, 105, 163 & 809 & 955 & X & X & X \\
27.64 & 120-55-8 & Diethylene glycol) dibenzo & 77, 105, 149 & 888 & 967 & X & \\
27.78 & Unknown (alkane structure) & 43, 57, 71 & & & & X \\
28.07 & 117-81-7 & Bis(2-ethylhexyl) phthalate (DEHP) \({}^{\star}\) & 149, 167 & 841 & 916 & X & X & X \\
28.25 & Unknown (sophthalic acid structure) & 82, 149, 231 & & & & X & \\
28.39 & Unknown (phthalate or benzoic acid structure) & 149, 167, 235, 253 & & & & X & X \\
28.87 & Unknown (phthalate or benzoic acid structure) & 149, 167, 235 & & & & & X \\
29.11 & 6197-30-4 & Octocylene \({}^{\star}\) & 178, 204, 248 & 613 & 840 & & & X \\
29.75 & Unknown (phthalate structure) & 82, 104, 149, 383 & & & X & & \\
29.47 & Unknown (alkane structure) & 43, 57, 71 & & & & & X \\
30.20 & Unknown (phthalate structure) & 82, 104, 149, 383 & & & & X & \\
30.39 & 111-02-4 & Squalene \({}^{\star}\) & 69, 81 & 677 & 787 & X & X & X \\
35.76 & Unknown (ester of adipic acid) & 55, 83, 129 & & & & & \\
36.70 & Unknown (phthalate structure) & 83, 149 & & & & X & \\
38.36 & & Terephthalatic acid ester of neopentyl glycol cyclic & 76, 104, 132, 149, 338, & & 773 & 961 & X & X & X \\  & dimer (C\({}_{28}\)H\({}_{23}\)O\({}_{8}\)) & 383, 468 & & & & & & \\ \hline \end{tabular} \({}^{\star}\) confirmed with standards; SI: direct matching factor; RSI: reverse search matching factor.  
\end{table} 
Table 2: _Cont._In addition to monomers, there are more chemical compounds involved in the manufacturing of polyester resins such as cross-linking agents, blocking agents, catalysts, lubricants, wetting agents, solvents, etc. Isophorone diisocyanate and caprolactam were present in the extracts; these substances are commonly used as a cross-linking and blocking agent, respectively, in polyester lacquers [37; 38]. Both are included in the regulation (EU) 10/2011 [21]. Trimethylolpropane, which was detected in sample CM2, can be used as a cross-linking agent [39] or as a polyol in the alkyl synthesis for coating formulations [40]. It is included in the regulation (EU) 10/2011 with a specific migration limit (SML) of 6 mg/kg [21]. Benzoguanamine, identified in CM1 and CM2, is another, often cross-linking, agent used in saturated polyester resin for can coatings [41]. Different plasticizers, such as acetyl tributyl citrate, bis(2-ethylhexyl) adipate (DEHA), triphenyl phosphate, di(ethylene glycol) dibenzoate, and phthalates, were identified in the extracts. Diisobutyl phthalate is another plasticizer commonly associated with printing inks or adhesives [42]. Dibbutyl phthalate and bis(2-ethylhexyl) phthalate (DEHP) were also detected. These compounds, as well as plasticizers, can be found in printing ink formulations and also have been employed as solvents to hold color [43].