## 3 Results
### Volatile Metabolites
\begin{table}
\begin{tabular}{l r r r r r r} \hline \hline  & \multicolumn{4}{c}{_Canophona_} & \multicolumn{3}{c}{_Arabica_} \\ \cline{2-7}  & **Light** & **Medium** & **Dark** & **Light** & **Medium** & **Dark** \\ \hline \hline  & 1305.24 \(\pm\) 28.81 & 1110.35 \(\pm\) 190.00 & 1209.18 \(\pm\) 157.76 & 2072.72 \(\pm\) 543.82 & 2013.86 \(\pm\) 303.80 & 27720.221 \(\pm\) 156.88 \\  & furfuryl formate & 28.89 \(\pm\) 4.32 & 33.71 \(\pm\) 4.26 & 26.76 \(\pm\) 2.85 & 28.92 \(\pm\) 6.76 & 20.35 \(\pm\) 2.98 & 303.38 \(\pm\) 5.17 \\  & 81.07 \(\pm\) 2.79 & 59.34 \(\pm\) 7.50 & 63.33 \(\pm\) 8.94 & 68.40 \(\pm\) 24.74 & 84.94 \(\pm\) 15.20 & 100.21 \(\pm\) 12.57 \\  & furfurylacetate & 85.13 \(\pm\) 0.55 & 117.89 \(\pm\) 7.47 & 76.75 \(\pm\) 5.65 & 82.39 \(\pm\) 21.51 & 65.05 \(\pm\) 10.65 & 81.50 \(\pm\) 4.98 \\  & 5-methyl-furfurral & 405.83 \(\pm\) 11.21 & 359.22 \(\pm\) 6.08 & 426.01 \(\pm\) 51.36 & 4858.08 \(\pm\) 124.92 & 5566.82 \(\pm\) 88.51 & 6202.33 \(\pm\) 339.70 \\  & methyl 12-furvate & 175.49 \(\pm\) 0.14 & 123.45 \(\pm\) 15.17 & 132.78 \(\pm\) 14.94 & 175.06 \(\pm\) 37.27 & 206.17 \(\pm\) 25.81 & 2379.4 \(\pm\) 10.01 \\  & 2-methyl-benzofuran & 34.32 \(\pm\) 2.02 & 27.33 \(\pm\) 3.24 & 27.90 \(\pm\) 4.05 & 23.56 \(\pm\) 2.27 & 31.96 \(\pm\) 4.85 & 28.21 \(\pm\) 7.01 \\  & 11.42 \(\pm\) 1.00 & 8.71 \(\pm\) 1.41 & 12.66 \(\pm\) 1.21 & 31.04 \(\pm\) 7.74 & 32.61 \(\pm\) 5.32 & 36.02 \(\pm\) 4.82 \\  & 2-furranemethanol & 323.02 \(\pm\) 26.34 & 265.50 \(\pm\) 11.74 & 427.83 \(\pm\) 88.07 & 222.28 \(\pm\) 91.44 & 380.82 \(\pm\) 49.71 & 394.50 \(\pm\) 9.95 \\  & pyridine & 453.61 \(\pm\) 50.95 & 455.99 \(\pm\) 72.79 & 374.43 \(\pm\) 53.72 & 155.63 \(\pm\) 36.84 & 237.41 \(\pm\) 43.93 & 268.44 \(\pm\) 13.63 \\  & 1343.26 \(\pm\) 27.22 & 914.10 \(\pm\) 54.48 & 801.57 \(\pm\) 85.20 & 288.40 \(\pm\) 78.89 & 390.00 \(\pm\) 48.87 & 367.76 \(\pm\) 15.52 \\  & & & & & & \\  & 467.34 \(\pm\) 3.65 & 366.51 \(\pm\) 24.43 & 272.60 \(\pm\) 21.98 & 244.57 \(\pm\) 40.85 & 274.90 \(\pm\) 22.75 & 358.48 \(\pm\) 12.98 \\  & dimethyl disulphide & 1037.48 \(\pm\) 94.03 & 963.95 \(\pm\) 40.66 & 675.75 \(\pm\) 54.18 & 701.26 \(\pm\) 19.40 & 864.42 \(\pm\) 121.34 & 1233.14 \(\pm\) 47.69 \\  & dimethyl trisulphide & 116.41 \(\pm\) 7.59 & 120.95 \(\pm\) 17.13 & 112.38 \(\pm\) 14.63 & 73.11 \(\pm\) 21.75 & 104.50 \(\pm\) 15.99 & 144.12 \(\pm\) 29.00 \\  & & & & & & \\  & 21.90 \(\pm\) 3.92 & 43.37 \(\pm\) 26.12 & 26.26 \(\pm\) 9.67 & 43.39 \(\pm\) 7.59 & 34.26 \(\pm\) 7.33 & 36.76 \(\pm\) 13.84 \\  & & ND & ND & ND & 201.21 \(\pm\) 4.86 & 171.26 \(\pm\) 34.13 & 154.70 \(\pm\) 26.02 \\  & & ND & ND & ND & 48.62 \(\pm\) 2.27 & 32.30 \(\pm\) 15.09 & 47.68 \(\pm\) 4.88 \\  & & & & & & \\  & & & & & &  
\begin{table}
\begin{tabular}{l r r r r r r} \hline \hline  & \multicolumn{6}{c}{**Natural**} \\ \hline  & \multicolumn{6}{c}{_Camephora_} & \multicolumn{6}{c}{_Arabica_} \\ \cline{2-7}  & **Light** & **Medium** & **Dark** & **Light** & **Medium** & **Dark** \\ \hline
**Pyroles** & & & & & & \\
1-methyl-pyrrole & 2650.90 + 411.16 & 2702 \(50\pm 577.42\) & 3540.61 + 258.43 & 2465.86 \(\pm\) 154.31 & 1827.32 \(\pm\) 103.42 & 1687.60 \(\pm\) 162.71 \\
1-ethyl-pyrrole & 1159.20 + 190.77 & 1217.46 + 299.52 & 1552.12 \(\pm\) 106.62 & 762.60 \(\pm\) 36.82 & 602.27 \(\pm\) 36.29 & 518.20 \(\pm\) 133.33 \\
1-pentyl-pyrrole & 1652.01 + 322.26 & 1509.49 + 346.66 & 2203.74 + 132.42 & 365.84 \(\pm\) 28.24 & 353.81 \(\pm\) 19.15 & 296.92 \(\pm\) 2.97 \\ pyrrole & 1450.12 + 235.54 & 1922.16 + 533.99 & 1916.90 \(\pm\) 298.47 & 689.08 \(\pm\) 46.17 & 577.45 \(\pm\) 31.28 & 529.06 \(\pm\) 25.53 \\
1-methyl-pyrrole-2 & 95.75 + 16.14 & 109.73 + 30.49 & 129.25 \(\pm\) 32.00 & 119.84 \(\pm\) 13.66 & 108.43 \(\pm\) 1.67 & 92.90 \(\pm\) 9.69 \\
2-acetyl-1-methyl- & 18.20 + 2.34 & 22.20 + 7.17 & 29.63 \(\pm\) 7.08 & 27.25 \(\pm\) 3.49 & 24.31 \(\pm\) 0.38 & 23.45 \(\pm\) 1.82 \\
2-ethyl-2-methyl- & 23.25 + 5.21 & 19.29 \(\pm\) 4.92 & 26.59 \(\pm\) 4.46 & 24.60 \(\pm\) 1.59 & 24.35 \(\pm\) 1.37 & 20.78 \(\pm\) 1.21 \\ pyrrole & 336.60 + 58.21 & 335.34 \(\pm\) 81.72 & 464.59 \(\pm\) 58.23 & 641.89 \(\pm\) 31.71 & 563.98 \(\pm\) 25.47 & 494.38 \(\pm\) 14.98 \\
2-acetyl-pyrorole & 51.40 + 11.36 & 59.37 \(\pm\) 54.33 & 40.18 \(\pm\) 13.81 & 59.41 \(\pm\) 4.16 & 70.72 \(\pm\) 5.82 & 63.55 \(\pm\) 4.06 \\
1-phorxide-2 & 86.26 + 17.75 & 164.47 \(\pm\) 155.16 & 96.95 \(\pm\) 33.64 & 133.26 \(\pm\) 9.82 & 160.39 \(\pm\) 13.64 & 139.25 \(\pm\) 13.08 \\
**Pyazines** & & & & & & \\
2-methyl-pyrazine & 212.05 + 41.88 & 189.89 \(\pm\) 46.56 & 235.22 \(\pm\) 91.88 & 413.01 \(\pm\) 59.97 & 390.79 \(\pm\) 68.81 & 329.02 \(\pm\) 12.63 \\
2-dimethyl-pyrazine & 45.71 + 7.47 & 42.93 \(\pm\) 13.40 & 54.50 \(\pm\) 18.87 & 80.40 \(\pm\) 14.36 & 73.87 \(\pm\) 6.63 & 59.97 \(\pm\) 6.44 \\
2-5-dimethyl-pyrazine & 41.16 + 7.58 & 37.54 \(\pm\) 10.57 & 45.26 \(\pm\) 14.50 & 65.88 \(\pm\) 7.63 & 67.04 \(\pm\) 3.85 & 51.60 \(\pm\) 8.24 \\
2-ethyl-pyrazine & 130.78 + 19.91 & 126.25 \(\pm\) 39.54 & 152.10 \(\pm\) 63.07 & 187.12 \(\pm\) 15.63 & 184.26 \(\pm\) 9.13 & 1659.47 \(\pm\) 10.68 \\
2-pentyl-furan & 3837.49 + 197.32 & 326.86 \(\pm\) 88.35 & 4607.14 \(\pm\) 492.76 & 902.51 \(\pm\) 799.60 & 6736.12 \(\pm\) 457.01 & 5659.68 \(\pm\) 67.72 \\ furtiural & 1196.27 + 139.12 & 1360.40 \(\pm\) 234.56 & 153.50 \(\pm\) 390.60 & 1073.32 \(\pm\) 66.820 & 9701.92 \(\pm\) 486.56 & 7491.19 \(\pm\) 91.949 \\
**furfuryl formate** & 30.72 + 4.01 & 25.49 \(\pm\) 4.92 & 53.54 \(\pm\) 7.67 & 101.87 \(\pm\) 9.60 & 19.07 \(\pm\) 0.46 & 81.34 \(\pm\) 7.62 \\
2-acetylfuran & 48.15 + 2.69 & 69.19 \(\pm\) 15.94 & 84.22 \(\pm\) 28.00 & 448.91 \(\pm\) 24.72 & 417.32 \(\pm\) 35.66 & 344.07 \(\pm\) 35.03 \\ furtiruylacetate & 60.86 + 9.33 & 69.53 \(\pm\) 21.20 & 117.96 \(\pm\) 20.86 & 126.14 \(\pm\) 12.66 & 118.87 \(\pm\) 2.05 & 1033.8 \(\pm\) 4.87 \\
5-methyl-furtiural & 335.22 \(\pm\) 36.52 & 414.95 \(\pm\) 101.62 & 405.37 \(\pm\) 110.94 & 1761.17 \(\pm\) 141.47 & 1664.01 \(\pm\) 76.20 & 1445.55 \(\pm\) 119.58 \\ methyl-2-trivate & 200.23 + 26.29 & 254.46 \(\pm\) 52.60 & 288.18 \(\pm\) 68.68 & 431.98 \(\pm\) 29.46 & 387.84 \(\pm\) 9.96 & 334.91 \(\pm\) 17.68 \\
2-methyl-benzofuran & 34.04 + 6.88 & 38.07 \(\pm\) 4.80 & 40.29 \(\pm\) 5.46 & 65.51 \(\pm\) 3.91 & 68.37 \(\pm\) 1.86 & 58.79 \(\pm\) 1.17 \\
2-acetyl-5-methyl- & 7.78 + 1.37 & 10.61 \(\pm\) 5.00 & 7.82 \(\pm\) 2.83 & 50.04 \(\pm\) 9.25 & 49.66 \(\pm\) 5.29 & 38.21 \(\pm\) 3.98 \\furan & 2-furanmethanol & 208.95 + 49.90 & 304.43 \(\pm\) 217.36 & 289.85 \(\pm\) 86.91 & 509.73 \(\pm\) 60.05 & 595.15 \(\pm\) 41.80 & 557.10 \(\pm\) 95.58 \\
**Pyidines** & & & & & & \\ pyridine & 351.95 \(\pm\) 53.51 & 411.19 \(\pm\) 73.97 & 579.64 \(\pm\) 101.52 & 161.57 \(\pm\) 16.00 & 104.05 \(\pm\) 15.19 & 104.22 \(\pm\) 19.20 \\
2-acetylpyridine & 2267.70 + 394.32 & 2111.30 \(\pm\) 463.02 & 2977.01 \(\Among the volatile compounds, seven furan derivatives (furfurfural, 5-methyl-furfural, furfuryl formate, 2-acetyl furan, methyl 2-fluoroate, 2-acetyl-5-methyl-furan, and 2-furanmethanol), four terpenoids (linalool and linalool oxides), two alkyl pyrazine derivatives (methyl- and ethyl-pyrazine), three alcohols (phenyl ethyl alcohol, 2-heptanol, and 1-hexanol), and an indole derivative characterised natural _Arabica_ CS, in contrast to washed _Arabica_ CS samples or _Canephora_ CS, independent of the roasting treatment.