## 4 Conclusions  
The present study assessed the quality characteristics of twenty-six edible fixed oils originating from the fatty parts of a plant (pulp or seeds) in order to highlight their healthy added value and application in foods. The saturated fatty acid profile of the examined oils revealed the presence of palmitic (C16:0), followed by stearic (C18:0), pentadecanoic (C15:0), myristic (C14:0), and lauric (C12:0) acids. Oleic acid (C18:1 n-9) was the predominant MUFA in all the oils, and linoleic (C18:2 n-6) and \(\alpha\)-linolenic (C18:3 n-3) acids were the major PUFA. Considering the nutritional quality of the oils, the ratios of UFA/SFA were greater than 1.6, whereas the lowest and the highest n-6/n-3 ratios were noticed in lineseed, chia seed, canola, and macadamia oils and in poppy seed, pine cone, apricot, pumpkin seed, hazelnut, and carrot oils, respectively. Oxidative stability was inversely related to the polyunsaturated fatty acid content. Regarding the color parameter measurement, L* values differed significantly; a* values were negative (green) except for sea buckthorn, pumpkin seed, and avocado oils, whereas positive b* values (yellow) varied from +3.83 (peanut oil) to +43.69 (canola oil), indicating an increase in the yellow proportion in color. Chlorophyll levels in edible oils did not exceed 50 mg/kg, preventing the oxidation in the presence of light. _B_-carotene, desirable due to its antioxidant and coloring properties, had rich content in soybean, lineseed, and canola oils. The results of the ATR-FTIR analysis pointed out that the intensity changes in the wavenumbers associated with monounsaturated bonds (3008 cm\({}^{-1}\), 1654 cm\({}^{-1}\), 1417 cm\({}^{-1}\), and 721 cm\({}^{-1}\)) were related to the fatty acid profile of the oils. More specifically, hazelnut, almond, avocado, plum, pomegranate, mustard seed, and apricot oils, rich in MUFA, exhibit lower intensities at those wavenumbers compared to oils rich in PUFA, such as evening primrose, chia seed, walnut, pine cone, and lineseed oils. Finally, the application of machine learning algorithms for analyzing ATR-FTIR band intensities and FA proportions via discriminant analysis was achieved to discriminate pulp from seed oils, with 96.0% and 88.0% classification accuracy, respectively. The research outcomes of the present study highlight the quality and nutritional superiority of the majority of the studied edible plant-based carrier oils, which in turn can be used as alternative oils for consumption or as fortifying agents in low-quality vegetable oils. In addition, the practical importance of the study could be of economic and nutritional interest to countries that rely on oilseed crops to support farmers and local industries. **Supplementary Materials:** The following supporting information can be downloaded at: [[https://www.mdpi.com/article/10.3390/app142210305/s1](https://www.mdpi.com/article/10.3390/app142210305/s1)]([https://www.mdpi.com/article/10.3390/app142210305/s1](https://www.mdpi.com/article/10.3390/app142210305/s1)), Table S1: Saturated fatty acid (SFA) composition (% of total) of edible fixed oils; Table S2: Monounsaturated fatty acid (MUFA) composition (% of total) of edible fixed oils; Table S3: Polynsaturated fatty acid (PUFA) composition (% of total) of edible fixed oils; Table S4: Relative intensities% of ATR-FTIR spectra bands of edible fixed oils. **Author Contributions:** Conceptualization, I.F.S. and V.J.S. ; methodology, I.F.S., K.T., A.P. and G.L. ; software, K.T. and D.C.; validation, I.F.S., K.T., G.L. and V.J.S. ; formal analysis, K.T. and A.P. ; investigation, I.F.S., A.P. and G.L. ; resources, D.C. and V.J.S. ; data curation, K.T. and D.C.; writing--original draft preparation, I.F.S. and V.J.S. ; writing--review and editing, I.F.S., K.T., G.L. and V.J.S. ; visualization, K.T., D.C. and G.L. ; supervision, I.F.S. and V.J.S. ; project administration, I.F.S. and V.J.S. All authors have read and agreed to the published version of the manuscript. **Funding:** This research received no external funding.