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Table 2 The concentrations of flavour compounds in the raw liquor obtained from the fermented Zaopei of experimental and control pits, respectively (mg/100 mL)

From: Improvement of caproic acid production in a Clostridium kluyveri H068 and Methanogen 166 co-culture fermentation system

Compounds

Control (mg/100 mL)

Pit-entry fermentation (mg/100 mL)

Ethyl acetate

75.36 ± 3.12

118.4 ± 4.68

Ethyl caproate

117.92 ± 10.94

286.29 ± 9.82

Ethyl butyrate

47.77 ± 6.32

81.4 ± 3.74

Ethyl lactate

283.73 ± 12.1

101.32 ± 5.62

Acetic acid

39.31 ± 3.58

48.83 ± 2.13

Caproic acid

15.94 ± 0.92

34.22 ± 2.67

Butyric acid

14.62 ± 0.52

18.71 ± 0.98

1-Propanol

13.2 ± 0.87

19.89 ± 1.18

Isobutanol

8.38 ± 0.76

11.05 ± 0.79