## 3 Results
### Element Content
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**Element**} & \multirow{2}{*}{**Edible Insect**} & \multirow{2}{*}{**Algae**} & \multirow{2}{*}{**SCP**} & \multirow{2}{*}{**Potato**} & \multirow{2}{*}{**Rice**} & \multirow{2}{*}{
\begin{tabular}{c} **WPC80** \\ **(Control)** \\ \end{tabular} } \\ \cline{2-2} \cline{6-7}  & & & & & **[mg/kg]** & \\ \hline Ca & 1590 \({}^{\text{c}}\)\(\pm\) 46 & 1820 \({}^{\text{d}}\)\(\pm\) 4.0 & 376 \({}^{\text{b}}\)\(\pm\) 4.0 & 14.4 \({}^{\text{a}}\)\(\pm\) 0.3 & 48.9 \({}^{\text{a}}\)\(\pm\) 1.9 & 4180 \({}^{\text{e}}\)\(\pm\) 22 \\ Mg & 1090 \({}^{\text{e}}\)\(\pm\) 26 & 2980 \({}^{\text{f}}\)\(\pm\) 7.0 & 573 \({}^{\text{c}}\)\(\pm\) 3.0 & 106 \({}^{\text{b}}\)\(\pm\) 4.0 & 68.2 \({}^{\text{a}}\)\(\pm\) 0.2 & 618 \({}^{\text{d}}\)\(\pm\) 1.0 \\ K & 11900 \({}^{\text{e}}\)\(\pm\) 44 & 18,700 \({}^{\text{f}}\)\(\pm\) 137 & 794 \({}^{\text{b}}\)\(\pm\) 3.0 & 2180 \({}^{\text{c}}\)\(\pm\) 4.0 & 94.7 \({}^{\text{a}}\)\(\pm\) 0.4 & 4230 \({}^{\text{d}}\)\(\pm\) 4.0 \\ Na & 3780 \({}^{\text{d}}\)\(\pm\) 22 & 34,300 \({}^{\text{f}}\)\(\pm\) 235 & 196 \({}^{\text{a}}\)\(\pm\) 3.0 & 7600 \({}^{\text{e}}\)\(\pm\) 70 & 591 \({}^{\text{b}}\)\(\pm\) 2.0 & 1490 \({}^{\text{c}}\)\(\pm\) 3.0 \\ Fe & 59.2 \({}^{\text{c}}\)\(\pm\) 0.2 & 257 \({}^{\text{f}}\)\(\pm\) 2.0 & 77.7 \({}^{\text{e}}\)\(\pm\) 0.4 & 72.7 \({}^{\text{d}}\)\(\pm\) 0.5 & 8.49 \({}^{\text{a}}\)\(\pm\) 0.2 & 19.3 \({}^{\text{b}}\)\(\pm\) 0.3 \\ Cu & 29.7 \({}^{\text{f}}\)\(\pm\) 0.3 & 0.750 \({}^{\text{a}}\)\(\pm\) 0.01 & 7.44 \({}^{\text{e}}\)\(\pm\) 0.03 & 2.29 \({}^{\text{c}}\)\(\pm\) 0.04 & 6.26 \({}^{\text{d}}\)\(\pm\) 0.02 & 1.15 \({}^{\text{b}}\)\(\pm\) 0.02 \\ Mn & 43.5 \({}^{\text{f}}\)\(\pm\) 0.5 & 14.3 \({}^{\text{d}}\)\(\pm\) 0.2 & 36.3 \({}^{\text{e}}\)\(\pm\) 0.3 & 2.92 \({}^{\text{c}}\)\(\pm\) 0.03 & 2.12 \({}^{\text{b}}\)\(\pm\) 0.03 & \textless0.1 \({}^{\text{a}}\) \\ Se & 0.150 \({}^{\text{c}}\)\(\pm\) 0.01 & 0.441 \({}^{\text{e}}\)\(\pm\) 0.01 & 0.135 \({}^{\text{b}}\)\(\pm\) 0.01 & \textless0.001 \({}^{\text{a}}\) & 0.170 \({}^{\text{d}}\)\(\pm\) 0.01 & 0.168 \({}^{\text{d}}\)\(\pm\) 0.01 \\ P & 9000 \({}^{\text{d}}\)\(\pm\) 143 & 8000 \({}^{\text{c}}\)\(\pm\) 265 & 10,000 \({}^{\text{e}}\)\(\pm\) 300 & 600 \({}^{\text{a}}\)\(\pm\) 17 & 3000 \({}^{\text{b}}\)\(\pm\) 96 & 3000 \({}^{\text{b}}\)\(\pm\) 20 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Element content in alternative and unconventional protein sources compared to the whey protein concentrate (WPC80—control sample). Different letters (a–f) in the same row indicate a significant difference at \(p<0.05\). sodium, as excess in the diet is not advisable and can lead to hypertension [45]. By far, the highest sodium content was determined in algae as high as 34,300 mg/kg, which means that even small amounts of algae can cause the recommended sodium intake per day to be exceeded, as the RDA (recommended dietary allowance) for sodium is 1500 mg/day in adults [46]. Next in terms of sodium content is potato protein (7600 mg/kg), edible insects (3780 mg/kg), and WPC80 (1490 mg/kg), while the lowest sodium content is found in SCP and rice protein (196 and 591 mg/kg). Therefore, the last two sources may be useful in people with hypertension and cardiovascular disease. Another element is iron, which is responsible for, among others, oxygen transport in the body and is essential for physically active people, pregnant women, and people on plant-based diets [47; 48]. Algae preparation has the highest iron content (257 mg/kg), followed by SCP and potato protein (77.7 and 72.7 mg/kg). In insects, the iron content is considerably lower than in algae (59.2 mg/kg), but it is still high. The fact that edible insects can be a good source of iron, calcium, magnesium, potassium, and phosphorus has already been written about by [PERSON] and [PERSON] (2016) and [PERSON] et al. (2015) [19; 49]. The insects also had higher iron content than the WPC80 and rice protein preparations (19.3 and 8.49 mg/kg).