## 3 Results
### Mineral Compositions and Total Polyphenol Contents  
The contents of several macro- and microelements and polyphenols along with the elemental compositions of the coffee beans are presented in Table 2.  
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Sample** & **C1** & **C2** & **C3** & **C4** & **C5** & **C6** \\ \hline Na (mg/kg) & 68.9 \(\pm\) 5.5\(\,{}^{\rm\,b}\) & 89.4 \(\pm\) 7.4\(\,{}^{\rm\,a}\) & 74.3 \(\pm\) 6.9\(\,{}^{\rm\,a}\) & 70.1 \(\pm\) 6.0\(\,{}^{\rm\,b}\) & 69.6 \(\pm\) 6.3\(\,{}^{\rm\,b}\) & 64.3 \(\pm\) 5.6\(\,{}^{\rm\,b}\) \\ \hline K (mg/kg) & 20,034 \(\pm\) 567\(\,{}^{\rm\,a}\) & 21,536 \(\pm\) 866\(\,{}^{\rm\,a}\) & 20,123 \(\pm\) 434\(\,{}^{\rm\,a}\) & 16,562 \(\pm\) 788\(\,{}^{\rm\,c}\) & 18,002 \(\pm\) 880\(\,{}^{\rm\,a}\) & 20,088 \(\pm\) 984\(\,{}^{\rm\,a}\) \\ \hline Ca (mg/kg) & 1332 \(\pm\) 86\(\,{}^{\rm\,a}\) & 1411 \(\pm\) 75\(\,{}^{\rm\,a}\) & 1342 \(\pm\) 84\(\,{}^{\rm\,a}\) & 889 \(\pm\) 60\(\,{}^{\rm\,b}\) & 934 \(\pm\) 63\(\,{}^{\rm\,b}\) & 1348 \(\pm\) 77\(\,{}^{\rm\,a}\) \\ \hline Mg (mg/kg) & 2112 \(\pm\) 127\(\,{}^{\rm\,a}\) & 2645 \(\pm\) 117\(\,{}^{\rm\,a}\) & 2301 \(\pm\) 160\(\,{}^{\rm\,a}\) & 1734 \(\pm\) 114\(\,{}^{\rm\,a}\) & 1815 \(\pm\) 137\(\,{}^{\rm\,a}\) & 2335 \(\pm\) 150\(\,{}^{\rm\,a}\) \\ \hline Fe (mg/kg) & 54.3 \(\pm\) 5.1\(\,{}^{\rm\,a}\) & 69.2 \(\pm\) 5.6\(\,{}^{\rm\,a}\) & 60.7 \(\pm\) 5.3\(\,{}^{\rm\,a}\) & 35.5 \(\pm\) 3.6\(\,{}^{\rm\,a}\) & 39.6 \(\pm\) 3.7\(\,{}^{\rm\,a}\) & 58.7 \(\pm\) 4.8\(\,{}^{\rm\,a}\) \\ \hline Cu (mg/kg) & 12.3 \(\pm\) 1.2\(\,{}^{\rm\,a}\) & 24.1 \(\pm\) 2.3\(\,{}^{\rm\,a}\) & 14.9 \(\pm\) 1.3\(\,{}^{\rm\,a}\) & 112 \(\pm\) 1.1\(\,{}^{\rm\,a}\) & 12.3 \(\pm\) 1.2\(\,{}^{\rm\,a}\) & 16.2 \(\pm\) 1.5\(\,{}^{\rm\,a}\) \\ \hline Mn (mg/kg) & 20.4 \(\pm\) 2.2\(\,{}^{\rm\,a}\) & 25.3 \(\pm\) 2.8\(\,{}^{\rm\,a}\) & 23.4 \(\pm\) 2.5\(\,{}^{\rm\,a}\) & 19.6 \(\pm\) 2.1\(\,{}^{\rm\,a}\) & 20.1 \(\pm\) 1.9\(\,{}^{\rm\,a}\) & 20.9 \(\pm\) 1.9\(\,{}^{\rm\,a}\) \\ \hline Zn (mg/kg) & 6.94 \(\pm\) 0.74\(\,{}^{\rm\,b}\) & 8.96 \(\pm\) 0.92\(\,{}^{\rm\,a}\) & 7.08 \(\pm\) 0.73\(\,{}^{\rm\,a}\) & 7.34 \(\pm\) 0.69\(\,{}^{\rm\,a}\) & 7.03 \(\pm\) 0.65\(\,{}^{\rm\,a}\) & 5.95 \(\pm\) 0.59\(\,{}^{\rm\,a}\) \\ \hline P (mg/kg) & 1524 \(\pm\) 111\(\,{}^{\rm\,b}\) & 1953 \(\pm\) 150\(\,{}^{\rm\,a}\) & 1652 \(\pm\) 127\(\,{}^{\rm\,a}\) & 1356 \(\pm\) 101\(\,{}^{\rm\,b}\) & 1455 \(\pm\) 109\(\,{}^{\rm\,a}\) & 1863 \(\pm\) 124\(\,{}^{\rm\,a}\) \\ \hline C (\%) & 48.9 \(\pm\) 0.65\(\,{}^{\rm\,a}\) & 50.4 \(\pm\) 0.68\(\,{}^{\rm\,a}\) & 49.6 \(\pm\) 0.72\(\,{}^{\rm\,a}\) & 48.9 \(\pm\) 0.59\(\,{}^{\rm\,a}\) & 49.0 \(\pm\) 0.67\(\,{}^{\rm\,a}\) & 49.4 \(\pm\) 0.64\(\,{}^{\rm\,a}\) \\ \hline H (\%) & 5.78 \(\pm\) 0.18\(\,{}^{\rm\,b}\) & 6.45 \(\pm\) 0.20\(\,{}^{\rm\,a}\) & 5.94 \(\pm\) 0.16\(\,{}^{\rm\,a}\) & 5.11 \(\pm\) 0.16\(\,{}^{\rm\,a}\) & 5.68 \(\pm\) 0.19\(\,{}^{\rm\,a}\) & 5.93 \(\pm\) 0.17\(\,{}^{\rm\,b}\) \\ \hline N (\%) & 2.96 \(\pm\) 0.10\(\,{}^{\rm\,a}\) & 3.05 \(\pm\) 0.10\(\,{}^{\rm\,a}\) & 2.99 \(\pm\) 0.08\(\,{}^{\rm\,a}\) & 1.64 \(\pm\) 0.06\(\,{}^{\rm\,b}\) & 1.76 \(\pm\) 0.05\(\,{}^{\rm\,a}\) & 3.05 \(\pm\) 0.09\(\,{}^{\rm\,a}\) \\ \hline S (\%) & 0.084 \(\pm\) 0.005\(\,{}^{\rm\,b}\) & 0.121 \(\pm\) 0.007\(\,{}^{\rm\,b}\) & 0.094 \(\pm\) 0.005\(\,{}^{\rm\,b}\) & 0.054 \(\pm\) 0.003\(\,{}^{\rm\,c}\) & 0.064 \(\pm\) 0.003\(\,{}^{\rm\,c}\) & 0.088 \(\pm\) 0.005\(\,{}^{\rm\,b}\) \\ \hline Polyphenol content (g GA/kg) & 14.5 \(\pm\) 0.5\(\,{}^{\rm\,a}\) & 18.9 \(\pm\) 0.6\(\,{}^{\rm\,a}\) & 16.4 \(\pm\) 0.7\(\,{}^{\rm\,b}\) & 13.3 \(\pm\) 0.5\(\,{}^{\rm\,a}\) & 14.8 \(\pm\) 0.6\(\,{}^{\rm\,a}\) & 15.7 \(\pm\) 0.5\(\,{}^{\rm\,a}\) \\ \hline \end{tabular}
\end{table}
Table 2: Mineral, C, H, N, S, and polyphenol contents in the studied coffee beans expressed as averages \(\pm\) standard deviations (n = 3). Different superscript letters represent significant differences (\(p<\) 0.05) in each parameter between the coffee-bean samples.  
Figure 4: Hierarchical cluster analysis through heatmapping of coffee samples.