# The Influence of Storage Conditions of Cold-Pressed Rapeseed Oil on Its Quality Parameters
## 3 Results and Discussion
\begin{table}
\begin{tabular}{c c c c c c c c} \hline
**Sample** & **Chlorophylls** & **Carotenoids** & **L\({}^{\star}\)** & **a\({}^{\star}\)** & **b\({}^{\star}\)** & **AV** & **ABTS** \\ \hline PET, 3 months, N\({}_{2}\), 25 \({}^{\circ}\)C & \(-\)7.04 & \(-\)6.14 & \(-\)0.52 & 20.46 & 3.37 & 123.06 & 57.06 \\ PET, 3 months, N\({}_{2}\), 4 \({}^{\circ}\)C & \(-\)7.04 & \(-\)6.68 & \(-\)2.57 & 40.10 & 3.29 & 59.87 & 27.68 \\ PET, 3 months, Air, 25 \({}^{\circ}\)C & \(-\)73.24 & \(-\)11.01 & \(-\)1.55 & 17.79 & 1.80 & 166.76 & 67.80 \\ PET, 3 months, Air, 4 \({}^{\circ}\)C & \(-\)7.04 & \(-\)3.25 & \(-\)2.80 & 31.19 & 2.82 & 67.02 & 49.72 \\ PET, 6 months, N\({}_{2}\), 25 \({}^{\circ}\)C & \(-\)81.69 & \(-\)13.72 & \(-\)2.66 & 35.12 & 5.74 & 167.29 & 106.21 \\ PET, 6 months, N\({}_{2}\), 4 \({}^{\circ}\)C & \(-\)12.68 & \(-\)7.22 & \(-\)2.96 & 60.58 & 4.94 & 89.81 & 77.97 \\ PET, 6 months, Air, 25 \({}^{\circ}\)C & \(-\)83.10 & \(-\)12.27 & \(-\)2.62 & 51.68 & 4.27 & 221.36 & 119.77 \\ PET, 6 months, Air, 4 \({}^{\circ}\)C & \(-\)12.68 & \(-\)8.48 & \(-\)3.31 & 52.42 & 4.39 & 102.41 & 70.06 \\ Clear glass, 3 months, N\({}_{2}\), 25 \({}^{\circ}\)C & \(-\)87.32 & \(-\)7.04 & \(-\)1.58 & 24.15 & 2.31 & 125.29 & 50.85 \\ Clear glass, 3 months, N\({}_{2}\), 4 \({}^{\circ}\)C & \(-\)8.45 & \(-\)6.32 & \(-\)2.53 & 31.59 & 4.68 & 50.09 & 29.38 \\ Clear glass, 3 months, Air, 25 \({}^{\circ}\)C & \(-\)69.01 & \(-\)22.38 & \(-\)1.08 & 20.92 & 2.35 & 160.41 & 62.15 \\ Clear glass, 3 months, Air, 4 \({}^{\circ}\)C & \(-\)19.72 & \(-\)4.87 & \(-\)2.65 & 35.66 & 3.84 & 71.58 & 53.11 \\ Clear glass, 6 months, N\({}_{2}\), 25 \({}^{\circ}\)C & \(-\)97.18 & \(-\)12.09 & \(-\)2.70 & 40.28 & 2.03 & 155.85 & 98.31 \\ Clear glass, 6 months, N\({}_{2}\), 4 \({}^{\circ}\)C & \(-\)21.13 & \(-\)7.22 & \(-\)3.03 & 51.11 & 4.85 & 103.31 & 85.31 \\ Clear glass, 6 months, Air, 25 \({}^{\circ}\)C & \(-\)95.77 & \(-\)35.38 & \(-\)3.23 & 65.43 & 2.34 & 218.23 & 110.17 \\ Clear glass, 6 months, Air, 4 \({}^{\circ}\)C & \(-\)21.13 & \(-\)5.96 & \(-\)2.92 & 48.91 & 3.85 & 108.04 & 66.10 \\ Colored glass, 3 months, N\({}_{2}\), 25 \({}^{\circ}\)C & \(-\)21.13 & \(-\)16.25 & \(-\)0.39 & 8.90 & 1.58 & 93.66 & 36.16 \\ Colored glass, 3 months, N\({}_{2}\), 4 \({}^{\circ}\)C & \(-\)12.68 & \(-\)3.07 & \(-\)1.25 & 23.58 & 2.79 & 27.52 & 11.86 \\ Colored glass, 3 months, Air, 25 \({}^{\circ}\)C & \(-\)30.99 & \(-\)17.69 & \(-\)0.98 & 8.44 & 3.53 & 127.44 & 44.63 \\ Colored glass, 3 months, Air, 4 \({}^{\circ}\)C & \(-\)4.23 & \(-\)7.40 & \(-\)1.22 & 28.23 & 2.43 & 66.31 & 39.55 \\ Colored glass, 6 months, N\({}_{2}\), 25 \({}^{\circ}\)C & \(-\)57.75 & \(-\)17.15 & \(-\)1.89 & 33.70 & 3.53 & 140.57 & 85.88 \\ Colored glass, 6 months, N\({}_{2}\), 4 \({}^{\circ}\)C & \(-\)14.08 & \(-\)7.04 & \(-\)2.86 & 60.77 & 3.65 & 71.76 & 71.19 \\ Colored glass, 6 months, Air, 25 \({}^{\circ}\)C & \(-\)45.07 & \(-\)28.70 & \(-\)2.41 & 65.43 & 4.69 & 184.09 & 98.87 \\ Colored glass, 6 months, Air, 4 \({}^{\circ}\)C & \(-\)15.49 & \(-\)13.36 & \(-\)2.00 & 48.91 & 3.63 & 81.05 & 50.85 \\ \hline \end{tabular}
\end{table} 
Table 3: Percentage (%) changes in rapeseed oil parameters during storage. related to the decomposition of natural dyes. The increase in the a* parameter was solely associated with the breakdown of chlorophylls, which decompose under the influence of UV radiation. However, the simultaneous change in both parameters resulted from slower carotenoid degradation, as shown in previous studies [1]. Based on the above research, it can be concluded that cold-pressed vegetable oils are best stored away from sunlight. According to CODEX ALIMENTARIUS [34], AV should not exceed 4 mg KOH/g of the tested oil; this determines the fresh oil. According to this criterion, temperature has the most significant impact on the oil's freshness. The tests showed that oils stored at 25 \({}^{\circ}\)C contained much higher quantities of free fatty acids than the other tested samples.