## 3 Results and Discussion
### Fatty Acid Composition of Analysed Oils
[43] presented a different composition of PO; they found the presence of oleic acid in the range of 80.9-81.00%, linoleic acid at 11.00-15.20%, stearic acid at 4.20%, and palmitic acid at 3.10%. In contrast, the results presented in the present study were similar to those obtained by [PERSON] et al. [44], who obtained a total proportion of SFAs in the range of 8.7-9.1%, MUFAs in the range of 30.5-31.5%, and PUFAs in the range of 53.8-56.8%. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multirow{2}{*}{**Fatty Acid**} & \multicolumn{8}{c}{**Oil Sample**} \\ \cline{2-8}  & **CO** & **FO** & **BO** & **PO** & **WCO** & **DO** & **TO** \\ \hline  
The content of polyunsaturated fatty acids in watercress seed oil was 41.62%, and the acids with the highest proportion were \(\alpha\)-linolenic acid (29.52%) and oleic acid (24.17%) (Table 3). The other acids identified in this oil were eicosenic (C20:1), linoleic (C18:2), and palmitic (C16:0), which were 11.99%, 11.48%, and 7.82%, respectively. The proportion of eicosenic acid was similar to that reported by [PERSON] et al. [45]. Different results were obtained by [PERSON] and [PERSON] [37], who reported that the WCO contained 48.43% \(\alpha\)-linolenic acid and only 15.35% oleic acid. However, the content of the linoleic and palmitic acids obtained by the researchers was similar to the results of the tested oil. It is noteworthy that in WCO several other acids were also identified which were not present in other oils or present in trace amounts. Such acids included erucic acid (C22:1) in the amount of 4.28%, nervonic acid (C24:1) constituting 1.17%, or lignoercic acid (C24:0) at the level of 0.69%, as well as dihomo-\(\gamma\)-linolenic acid (C18:3 cis-6,9,12), constituting 0.11% of all the acids. [PERSON] et al. [45] reported that CCS seed oil contains 3.6% erucic acid (C22:1), but no other unusual acids were identified in the oil studied by the authors. The lowest content of PUFAs was found in coriander seed oil, which contained only 14.93%. On the other hand, it was the richest source of MUFA acids among all the analysed ones. The monounsaturated fatty acid (mainly oleic) content in this oil was 73.67% (Table 4). Similar results for CO were obtained by [PERSON] et al. [46], who determined the content of MUFAs at 78.74% and PUFAs at 15.03%. The relatively high content of MUFAs was characterised by WCO, which contained as much as 41.81% (Table 4). [PERSON] et al. [47] report a slightly lower value of 37.37%. PO and DO were characterised by more than thirty percent MUFA content, while for FO, BO, and TO much lower values ranging from 15.13% to 18.27% were obtained (Table 3). Taking into account the saturated fatty acid SFA, it was found that their highest content was characterised by TO--16.78% (Table 3). A similar high content of SFA acids was characterised by TO, as analysed by [PERSON] et al. [48], for which a value of 20.61% was obtained. A similar content of saturated fatty acids, equal to 16.08%, was obtained in FO. The remaining oils were characterised by a lower proportion of SFAs ranging from 8.89 to 15.10% (Table 4). CO was noteworthy because only in it were saturated short-chain acids such as butyric, caproic, and caprylic acids identified, and the total proportion of these acids was 5.53%. However, the tested coriander seed oil had the lowest total content of SFAs, i.e., at 8.89%. [PERSON] et al. [30] reported an even lower proportion of saturated acids--3.2%, of which only 0.1% was (the only short-chain acid identified) caproic acid (C6:0).