## 5 Patents  
Patent Poland, no 421913. Vacuum impregnating machine and method for initial processing of material. Wroclaw University of Environmental and Life Sciences, Wroclaw, PL. Auhors: [PERSON], [PERSON], [PERSON], [PERSON].  
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Material** & **Method** & **Hardness** & **Cohesiveness** & **Springiness** & **Gumminess** \\ \hline \multirow{3}{*}{F} & - & 345.3 \(\pm\) 19.6 \({}^{\text{f}}\) & 0.47 \(\pm\) 0.03 \({}^{\text{d,e}}\) & 0.64 \(\pm\) 0.03 \({}^{\text{c,d}}\) & 147.26 \(\pm\) 10.41 \({}^{\text{c,d}}\) \\  & FD & 310.90 \(\pm\) 7.4 \({}^{\text{e}}\) & 0.47 \(\pm\) 0.03 \({}^{\text{e}}\) & 0.64 \(\pm\) 0.03 \({}^{\text{f}}\) & 147.26 \(\pm\) 10.4 \({}^{\text{d}}\) \\  & VD & 345.2 \(\pm\) 14.2 \({}^{\text{f}}\) & 0.42 \(\pm\) 0.03 \({}^{\text{e}}\) & 0.53 \(\pm\) 0.03 \({}^{\text{d}}\) & 146.27 \(\pm\) 12.51 \({}^{\text{d}}\) \\ \hline \multirow{3}{*}{N} & FD & 102.7 \(\pm\) 0.5 \({}^{\text{a}}\) & 0.22 \(\pm\) 0.09 \({}^{\text{a,b}}\) & 0.37 \(\pm\) 0.05 \({}^{\text{b}}\) & 22.10 \(\pm\) 2.34 \({}^{\text{a}}\) \\  & VD & 224.6 \(\pm\) 12.3 \({}^{\text{c}}\) & 0.38 \(\pm\) 0.12 \({}^{\text{c,d,e}}\) & 0.51 \(\pm\) 0.06 \({}^{\text{d}}\) & 85.25 \(\pm\) 25.84 \({}^{\text{b}}\) \\ \hline \multirow{3}{*}{O} & FD & 168.3 \(\pm\) 3.6 \({}^{\text{b}}\) & 0.13 \(\pm\) 0.02 \({}^{\text{a}}\) & 0.28 \(\pm\) 0.02 \({}^{\text{a}}\) & 22.10 \(\pm\) 2.34 \({}^{\text{a}}\) \\  & VD & 273.7 \(\pm\) 13.9 \({}^{\text{d}}\) & 0.43 \(\pm\) 0.04 \({}^{\text{e}}\) & 0.51 \(\pm\) 0.01 \({}^{\text{c,d}}\) & 119.81 \(\pm\) 11.93 \({}^{\text{c}}\) \\ \hline \multirow{3}{*}{K} & FD & 115.4 \(\pm\) 4.2 \({}^{\text{a}}\) & 0.15 \(\pm\) 0.03 \({}^{\text{a}}\) & 0.30 \(\pm\) 0.03 \({}^{\text{a}}\) & 17.36 \(\pm\) 3.28 \({}^{\text{a}}\) \\  & VD & 225.9 \(\pm\) 18.6 \({}^{\text{c}}\) & 0.32 \(\pm\) 0.06 \({}^{\text{c}}\) & 0.46 \(\pm\) 0.01 \({}^{\text{c}}\) & 70.86 \(\pm\) 11.51 \({}^{\text{b}}\) \\ \hline \multirow{3}{*}{OK} & FD & 167.6 \(\pm\) 3.5 \({}^{\text{b}}\) & 0.13 \(\pm\) 0.02 \({}^{\text{a}}\) & 0.28 \(\pm\) 0.02 \({}^{\text{a}}\) & 22.00 \(\pm\) 2.34 \({}^{\text{a}}\) \\  & VD & 261.6 \(\pm\) 12.9 \({}^{\text{d}}\) & 0.30 \(\pm\) 0.05 \({}^{\text{b,c}}\) & 0.51 \(\pm\) 0.01 \({}^{\text{d}}\) & 79.66 \(\pm\) 13.07 \({}^{\text{b}}\) \\ \hline \hline \end{tabular} Note: Mean followed by different letters (a–f) in the column differs significantly (\(p<\) 0.05).  
\end{table}
Table 7: Texture profile analysis (TPA) test of sweet potato dried by freeze drying and vacuum drying when fresh (F) and impregnated in sodium chloride (N), onion juice (O), kale juice (K), or onion + kale juice (OK). Mean followed by different letters in the column differs significantly (\(p<\) 0.05).  
**Author Contributions:** Conceptualization, M.K., J.K.-O. and J.L.; methodology, M.K.; validation, M.K., J.K.-O. and J.L.; investigation, M.K., J.K.-O., J.L., B.S. and J.M.; writing--original draft preparation, M.K., J.K.-O. and J.L.; writing--review and editing, M.K., B.S. and M.P.; visualization, M.K.; supervision, M.K.; project administration, M.K.; funding acquisition, M.K. All authors have read and agreed to the published version of the manuscript.  
**Funding:** This research was funded by Wroclaw University of Environmental and Life Sciences, Poland, grant number N060/0013/20.  
**Informed Consent Statement:** Not applicable.  
**Data Availability Statement:** Additional data are available on request to the authors.  
**Conflicts of Interest:** The authors declare no conflict of interest.