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Table 1 Summary of gas chromatogram of bio-ethanol concentration determination

From: Bio-ethanol production from wet coffee processing waste in Ethiopia

Sample Reten. time (min) Area (mV s) Height (mV) Area (%) Height (%)
Pure ethanol (95%) 0.639 5069 893 100 100
Total 5069 893 100 100
Sample hydrolyzed by 0.2 M H2SO4 0.283 1623 241 31.3 23.7
0.616 3565 774 68.7 76.3
Total 5188 1014 100 100
Sample hydrolyzed by 0.2 M H2SO4 + 2 mL of pure ethanol (95%) added 0.276 2148 402 24.4 31.4
0.639 6665 879 75.6 68.6
Total 8813 1281 100 100
Sample hydrolyzed by 0.4 M H2SO4 0.286 2101 300 22.0 25.5
0.632 7450 875 78.0 74.5
Total 9551 1175 100 100
Sample hydrolyzed by 0.6 M H2SO4 0.283 2528 315 24.5 24.5
0.609 7804 885 75.5 73.8
Total 10,332 1199 100 100
Sample hydrolyzed by 0.8 M H2SO4 0.303 2624 183 29.6 21.0
0.622 6233 688 70.4 79.0
Total 8857 871 100 100
Sample hydrolyzed by 1 M H2SO4 0.280 3296 241 36.5 23.4
0.616 5735 789 63.5 76.6
Total 9031 1030 100 100
Sample hydrolyzed by distilled water 0.310 15,724 937 70.2 52.9
0.636 6680 833 29.8 47.1
Total 22,404 1770 100 100
  1. Samples were hydrolyzed at 100 °C and fermented for 24 h