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Table 2 Summary of end-product yields, optimal growth temperatures, total molar reduction values of H 2  + ethanol ( RV EP ), and growth conditions employed

From: Linking genome content to biofuel production yields: a meta-analysis of major catabolic pathways among select H2and ethanol-producing bacteria

Organism

Growth temp (°C)

End products (mol/mol hexose equivalent)

 

Growth condition

Ref

  

H2

CO2

Acetate

Ethanol

Formate

Lactate

RV EP

  

Ca. saccharolyticus DSM 8903

70

4.0

1.8

NR

ND

ND

ND

4.0

Cont., 1.1 g l-1 glucose (D = 0.09 h-1)

[24]

  

3.6

1.5

1.6

ND

ND

ND

3.6

Cont., 4.1 g l-1 glucose (D = 0.1 h-1)

[24]

  

3.5

NR

2.1

NR

NR

NR

3.5

Batch, 10 g l-1 sucrose

[25]

  

2.5

1.4

1.4

ND

ND

0.1

2.5

Batch, 10 g l-1 glucose

[26]

Ca. bescii DSM 6725

75

✓

✓

✓

NR

NR

✓

NA

 

[27, 28]

P. furiosus DSM 3638

90

3.8

1.9

1.5

0.1

NR

NR

4.0

Cont, cellobiose (D = 0.45 h-1)

[29]A

  

3.5

1.0

1.4

ND

NR

ND

3.5

Batch, 1.9 g l-1, maltose

[30]A

  

2.9

1.9

0.8

0.1

NR

ND

3.1

Batch, 2 g l-1 maltose

[31]B

  

2.8

0.9

1.2

ND

NR

ND

2.8

Batch, 3.5 g l-1, cellobiose

[30]A

  

2.6

1.4

1.0

ND

NR

NR

2.6

Cont, maltose (D = 0.45 h-1)

[29]A

Th. kodakaraensis KOD1

85

3.3

1.8

1.1

NR

NR

NR

3.3

Cont, starch (D = 0.2 h-1)

[32]C

T. neapolitana DSM 4359

80-85

3.8

2.0

1.8

ND

NR

0.1

3.8

Batch, 2.5 g l-1 glucose

[33]

  

3.2

NR

1.9

NR

NR

NR

3.2

Batch (N2 sparged), 7.0 g l-1 glucose

[34]

  

2.4

NR

1.1

NR

NR

0.7

2.4

Batch, 1.1 g l-1 glucose

[35]

  

1.8

NR

1.0

NR

NR

NR

1.8

Batch, 7.5 g l-1 glucose

[40]

  

1.8

NR

1.5

NR

NR

NR

1.8

Batch, 7.0 g l-1 glucose

[34]

T. petrophila RKU-1

80

3.7

0.4

1.8

NR

NR

0.3

3.7

Batch, 1 g l-1 glucose

[36]

T. maritima MSB8

80

4.0

2.0

2.0

NR

ND

NR

4.0

Batch, 2 g l-1 glucose

[38]

  

2.2

1.1

1.0

ND

NR

0.3

2.2

Batch, 3 g l-1 glucose

[39]

  

1.7

NR

1.0

NR

NR

NR

1.7

Batch, 7.5 g l-1 glucose

[40]

Cal. subterraneus subsp. tengcongensis MB4

75

2.8

NR

1.4

0.6

NR

ND

4.0

Cont, starch (D = 0.27 h-1)

[42]

  

NR

NR

2.0

ND

NR

ND

NA

Cont (N2 sparged), glucose (D = 0.24 h-1)

[42]

  

0.3

1.5

1.0

0.7

NR

ND

1.7

Batch, 4 g l-1 glucose

[41]

E. harbinense YUAN-3 T

35

2.8

✓

0.7

1.1

ND

ND

5.0

Batch, 20 g l-1 glucose

[43]

C. cellulolyticum H10

37

1.6

1.0

0.8

0.3

ND

NR

2.2

Batch, 5 g l-1 cellulose

[44]

  

1.8

1.1

0.8

0.4

ND

NR

2,6

Batch, 5 g l-1 cellobiose

[44]

C. phytofermentans ISDg

35-37

Major

Major

0.6

1.4

0.1

0.3

NA

Batch, 34 g l-1 cellobiose

[45]

  

1.0

0.9

0.6

0.5

0.1

NR

2.0

Batch, 5 g l-1 cellulose

[44]

  

1.6

1.2

0.6

0.6

ND

NR

2.8

Batch, 5 g l-1 cellobiose

[44]

C. thermocellum ATCC 27405

60

0.8

1.1

0.7

0.8

0.3

ND

2.4

Batch, 1.1 g l-1 cellobiose

[10]

  

1.0

0.8

0.8

0.6

0.4

0.4

2.2

Batch, 4.5 g l-1 cellobiose

[46]

C. thermocellum DSM 4150

60

1.8

1.7

0.9

0.8

ND

0.1

3.4

Batch, 2 g l-1 glucose

[47]

  

0.6

1.8

0.3

1.4

ND

0.2

3.4

Batch, 27 g l-1 cellobiose

[47]

Ta. pseudethanolicus 39E

65

0.1

2.0

0.1

1.8

NR

0.1

3.7

Batch, 8 g l-1 glucose

[50]

  

NR

NR

NR

1.6

NR

<0.1

3.2

1 g l-1 xylose

[48]

  

NR

NR

0.4

1.0

NR

<0.1

2.0

Batch, 20 g l-1 xylose

[49]

  

NR

NR

0.2

0.4

NR

1.1

0.8

Batch, 20 g l-1 glucose

[49]

G. thermoglucosidasius M10EXGD

60

NR

NR

0.6

0.4

1.0

0.9

0.8

Batch, 10 g l-1 glucose

[52]

B cereus ATCC 14579

35

NR

0.1

0.2

0.2

0.3

1.1

0.4

Batch, 3.6 g l-1 glucose

[51]

  1. A ~ 0.5 mol alanine per mol-hexose produced on cellobiose and maltose.
  2. BProduces H2, CO2, volatile fatty acids, and NH3 on peptides in the absence of carbon source.
  3. C ~ 0.5 mol alanine per mol-hexose produced on starch.
  4. DOnly G. thermoglucosidasuis strain C56-TS93 has been sequenced but no end-product data is available. Strain M10EXG was used for end-product yield comparisons instead.
  5. Abbreviations: NR, not reported; ND, not detected; NA, not applicable; Major, reported as major product without absolute values; ✓, reported as present with no values indicated; Cont, continuous culture; D, dilution rate.