## 3 Results and Discussion
### Total Phenolic Content and Antioxidant Capacity of the Samples
Figure 3 shows the relative antioxidant capacity indexes (RACIs) of our samples, calculated according to the method  
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Sample**} & **TPC** & **FRAP** & **CUPRAC** & **TEAC** & **DPPH** \\  & **(mg GAE/g)** & **(mg AAE/g)** & **(mg TE/g)** & **(mg TE/g)** & **(mg TE/g)** \\ \hline barley grass & 8.17 \(\pm\) 0.28 \({}^{\text{hi}}\) & 5.33 \(\pm\) 0.28 \({}^{\text{f}}\) & 18.26 \(\pm\) 1.39 \({}^{\text{hi}}\) & 2.55 \(\pm\) 0.17 \({}^{\text{gh}}\) & 6.16 \(\pm\) 0.04 \({}^{\text{g}}\) \\ wheat grass & 7.43 \(\pm\) 0.53 \({}^{\text{hi}}\) & 4.78 \(\pm\) 0.18 \({}^{\text{f}}\) & 17.20 \(\pm\) 1.81 \({}^{\text{hi}}\) & 2.59 \(\pm\) 0.07 \({}^{\text{g}}\) & 5.05 \(\pm\) 0.03 \({}^{\text{h}}\) \\ spinach & 14.93 \(\pm\) 0.72 \({}^{\text{g}}\) & 6.19 \(\pm\) 0.21 \({}^{\text{f}}\) & 26.46 \(\pm\) 0.68 \({}^{\text{g}}\) & 4.73 \(\pm\) 0.13 \({}^{\text{ef}}\) & 7.75 \(\pm\) 0.06 \({}^{\text{g}}\) \\ beetroot & 3.92 \(\pm\) 0.34 \({}^{\text{i}}\) & 3.79 \(\pm\) 0.05 \({}^{\text{f}}\) & 9.13 \(\pm\) 0.38 \({}^{\text{i}}\) & 1.58 \(\pm\) 0.05 \({}^{\text{h}}\) & 1.77 \(\pm\) 0.02 \({}^{\text{i}}\) \\ sea buckthorn & 18.74 \(\pm\) 0.42 \({}^{\text{f}}\) & 10.09 \(\pm\) 0.62 \({}^{\text{de}}\) & 38.52 \(\pm\) 0.59 \({}^{\text{f}}\) & 7.96 \(\pm\) 0.17 \({}^{\text{d}}\) & 19.82 \(\pm\) 0.65 \({}^{\text{f}}\) \\ rosehip & 55.23 \(\pm\) 0.58 \({}^{\text{e}}\) & 42.61 \(\pm\) 2.09 \({}^{\text{b}}\) & 143.03 \(\pm\) 2.61 \({}^{\text{e}}\) & 27.31 \(\pm\) 0.07 \({}^{\text{b}}\) & 94.39 \(\pm\) 2.00 \({}^{\text{c}}\) \\ aronia & 64.28 \(\pm\) 0.89 \({}^{\text{b}}\) & 43.89 \(\pm\) 2.25 \({}^{\text{b}}\) & 159.38 \(\pm\) 1.73 \({}^{\text{b}}\) & 28.48 \(\pm\) 0.42 \({}^{\text{b}}\) & 107.82 \(\pm\) 0.18 \({}^{\text{b}}\) \\ acerola & 164.82 \(\pm\) 1.88 \({}^{\text{a}}\) & 166.66 \(\pm\) 7.04 \({}^{\text{a}}\) & 300.43 \(\pm\) 4.00 \({}^{\text{a}}\) & 79.32 \(\pm\) 2.71 \({}^{\text{a}}\) & 289.41 \({}^{\text{a}}\) + 9.61 \({}^{\text{a}}\) \\ goji berry & 25.33 \(\pm\) 0.96 \({}^{\text{e}}\) & 7.17 \(\pm\) 0.76 \({}^{\text{ef}}\) & 47.52 \(\pm\) 1.61 \({}^{\text{e}}\) & 8.49 \(\pm\) 0.37 \({}^{\text{d}}\) & 16.39 \(\pm\) 1.58 \({}^{\text{f}}\) \\ lucuma & 2.28 \(\pm\) 0.19 \({}^{\text{j}}\) & 0.74 \(\pm\) 0.04 \({}^{\text{h}}\) & 5.36 \(\pm\) 0.33 \({}^{\text{k}}\) & 0.89 \(\pm\) 0.01 \({}^{\text{h}}\) & 1.93 \(\pm\) 0.05 \({}^{\text{i}}\) \\ spirulina & 5.04 \(\pm\) 0.68 \({}^{\text{j}}\) & 4.96 \(\pm\) 0.23 \({}^{\text{f}}\) & 14.19 \(\pm\) 0.98 \({}^{\text{j}}\) & 1.53 \(\pm\) 0.06 \({}^{\text{h}}\) & 1.17 \(\pm\) 0.21 \({}^{\text{j}}\) \\ chlorella & 2.70 \(\pm\) 0.34 \({}^{\text{j}}\) & 1.49 \(\pm\) 0.10 \({}^{\text{g}}\) & 8.46 \(\pm\) 1.23 \({}^{\text{k}}\) & 0.82 \(\pm\) 0.02 \({}^{\text{h}}\) & 0.10 \(\pm\) 0.07 \({}^{\text{j}}\) \\ duckweed & 21.98 \(\pm\) 0.44 \({}^{\text{e}}\) & 14.52 \(\pm\) 0.25 \({}^{\text{c}}\) & 39.17 \(\pm\) 0.62 \({}^{\text{ef}}\) & 10.82 \(\pm\) 0.35 \({}^{\text{e}}\) & 26.31 \(\pm\) 1.08 \({}^{\text{e}}\) \\ moringa & 32.05 \(\pm\) 0.98 \({}^{\text{d}}\) & 12.22 \(\pm\) 0.67 \({}^{\text{cd}}\) & 63.91 \(\pm\) 1.80 \({}^{\text{d}}\) & 13.02 \(\pm\) 0.27 \({}^{\text{c}}\) & 32.18 \(\pm\) 0.43 \({}^{\text{d}}\) \\ turmeric & 30.89 \(\pm\) 0.60 \({}^{\text{d}}\) & 11.68 \(\pm\) 0.26 \({}^{\text{d}}\) & 58.28 \(\pm\) 1.80 \({}^{\text{d}}\) & 12.99 \(\pm\) 0.78 \({}^{\text{c}}\) & 31.41 \(\pm\) 1.41 \({}^{\text{de}}\) \\ ginger & 10.19 \(\pm\) 0.22 \({}^{\text{h}}\) & 10.08 \(\pm\) 0.14 \({}^{\text{de}}\) & 22.38 \(\pm\) 0.22 \({}^{\text{h}}\) & 4.27 \(\pm\) 0.11 \({}^{\text{th}}\) & 15.39 \(\pm\)proposed by [PERSON] and [PERSON] [32], taking into account the results of the four assays weighed equally. The RACIs of the powders were between \(-0.59\) and \(+3.34\). Among the fourteen samples, only acerola, aronia, and rosehip powders resulted in positive RACI values. This figure clearly illustrates the differences between the antioxidant potential of the samples, as well as the outstanding antioxidant potential of acerola powder.