Production of medium-chain carboxylic acids by Megasphaera sp. MH with supplemental electron acceptors

Table 2 Performance comparison for biological hexanoic acid production

Substrate	Inoculum	Time (Day)	Maximum hexanoic acid (g L⁻¹)	Productivity (g L⁻¹H)	References
Fructose, acetate, butyrate	Megasphaera sp. MH (pure culture)	1	9.7	0.41	This study
Galactitol, acetate, butyrate	Clostridium sp. BS-1 (pure culture)	3–16^a	6.96–32.0^a	0.28–0.34	Jeon et al. [28]
Glucose	Megasphaera elsdenii ATCC 25940 (pure culture)	5–8.3^a	2.6–11.4^a	0.03–0.13	Roddick and Britz [29]
Ethanol, acetate	C. kluyveri 3231B (pure culture)	3	12.8	0.175	Weimer and Stevenson [6]
Lactate	Mature pit mud, enriched Clostridium cluster IV	5–16^a	12.93–23.93^a	0.06–0.108^a	Zhu et al. [30]
Acetate, butyrate, ethanol	Mixed culture	500	0.9	0.0375	Agler et al. [31]

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