## 3 Results
### The Impact of Packaging Material on Vitamin C Content
\begin{table}
\begin{tabular}{c c c c c} \hline
**Plant juices** & **Containers** & **t = 4 \({}^{\circ}\)C** & **t = 23 \({}^{\circ}\)C** & **t = \(-\)18 \({}^{\circ}\)C** \\ \hline \multirow{2}{*}{Chive} & Glass & y = \(-\)2.910x + 53.610 & y = \(-\)3.100x + 53.580 & y = \(-\)3.356x + 54.062 \\  & Plastic & y = \(-\)3.060x + 53.020 & y = \(-\)3.073x + 53.551 & y = \(-\)3.400x + 54.120 \\ \hline \multirow{2}{*}{Dandelion} & Glass & y = \(-\)1.560x + 71.800 & y = \(-\)1.990x + 72.470 & y = \(-\)2.340x + 73.000 \\  & Plastic & y = \(-\)1.715x + 71.975 & y = \(-\)2.070x + 72.270 & y = \(-\)2.365x + 72.965 \\ \hline \multirow{2}{*}{Nettle} & Glass & y = \(-\)1.270x + 80.110 & y = \(-\)1.635x + 79.735 & y = \(-\)2.000x + 80.180 \\  & Plastic & y = \(-\)1.250x + 79.130 & y = \(-\)1.680x + 79.720 & y = \(-\)2.030x + 80.107 \\ \hline \multicolumn{2}{c}{**Vegetable juices**} & & & \\ \hline \multirow{2}{*}{Tomato} & Glass & y = \(-\)0.205x + 10.705 & y = \(-\)0.775x + 11.135 & y = \(-\)0.785x + 11.515 \\  & Plastic & y = \(-\)0.426x + 10.976 & y = \(-\)1.000x + 11.270 & y = \(-\)0.855x + 11.515 \\ \hline \multirow{2}{*}{Carrot} & Glass & y = \(-\)0.582x + 5.890 & y = \(-\)0.457x + 5.715 & y = \(-\)0.588x + 5.712 \\  & Plastic & y = \(-\)0.632x + 5.850 & y = \(-\)0.518x + 5.712 & y = \(-\)0.568x + 5.232 \\ \hline \multirow{2}{*}{Salad cucumber} & Glass & y = \(-\)0.180x + 6.800 & y = \(-\)0.190x + 6.890 & y = \(-\)0.280x + 6.940 \\  & Plastic & y = \(-\)0.230x + 6.818 & y = \(-\)0.200x + 6.860 & y = \(-\)0.295x + 6.805 \\ \hline \multirow{2}{*}{Red pepper} & Glass & y = \(-\)4.365x + 157.760 & y = \(-\)4.47 x + 157.770 & y = \(-\)4.890x + 157.950 \\  & Plastic & y = \(-\)4.490x + 157.730 & y = \(-\)4.490x + 157.670 & y = \(-\)4.985x + 158.030 \\ \hline \multirow{2}{*}{Red pepper} & Glass & y = \(-\)4.365x + 157.760 & y = \(-\)4.47 x + 157.770 & y = \(-\)4.890x + 157.950 \\  & Plastic & y = \(-\)4.490x + 157.730 & y = \(-\)4.490x + 157.670 & y = \(-\)4.985x + 158.030 \\ \hline \multirow{2}{*}{White cabbage} & Glass & y = \(-\)1.000x + 11.920 & y = \(-\)1.08x + 11.880 & y = \(-\)1.225x + 12.285 \\  & Plastic & y = \(-\)1.1050x + 11.830 & y = \(-\)1.140x + 11.940 & y = \(-\)1.305x + 12.105 \\ \hline \end{tabular}
\end{table} 
Table 2: Vitamin C levels in plant and vegetable juices depend on the kind of package and temperature. 3.356 mg/100 g), and nettles experienced a loss of 1.27 mg/100 g (1.64 mg/100 g, 2.00 mg/100 g), being the lowest decrease. The vitamin C content of the dandelion juice decreased with temperature as follows: by 1.56 mg/100 g (t\({}_{1}\)), 1.99 mg per 100 g (t\({}_{2}\)), and 2.34 mg per 100 g (t\({}_{3}\)) of the plant juice. By comparing the observed temperatures (t\({}_{1}\)-t\({}_{2}\)) at which the plant (chives, dandelion, and nettle) juices were stored in glass containers (Table 2), it appears that the optimum temperature for all the plant juices examined was t\({}_{1}\) = 4 \({}^{\circ}\)C, followed by t\({}_{2}\) = 23 \({}^{\circ}\)C, and that the juice stored at t\({}_{3}\) = \(-\)18 \({}^{\circ}\)C showed the greatest loss of vitamin C content. At the temperatures measured for plastic containers, the loss of vitamin C increased at a similar rate to that of the vegetable juices stored in glass containers. The vitamin C content was slowly reduced in the juices of vegetables kept in glass containers with time. Table 2 shows the linear equations for the decrease in vitamin C content (mg) in vegetables per 100 g of juice over one week at three different temperatures (4 \({}^{\circ}\)C, 23 \({}^{\circ}\)C, and 18 \({}^{\circ}\)C). The equations demonstrate that the red pepper juice had the greatest contents of vitamin C reduction in glass containers at temperatures from t\({}_{1}\) to t\({}_{3}\) (4.37 mg/100 g, 4.47 mg/100 g, 4.89 mg/100 g), and the salad cucumber juice had some of the smallest amounts (0.18 mg/100 g, 0.19 mg/100 g, 0.28 mg/100 g). The above observation is true when comparing absolute values, but the decrease in vitamin C concentration is quite similar in relative values.