Production of poly-γ-glutamic acid by a thermotolerant glutamate-independent strain and comparative analysis of the glutamate dependent difference

AMB Express

Table 1 Comparison of γ-PGA production in Bacillus with glutamate-independent

Strains	Medium components		Fermentation conditions			Yield (g/L)	Conversion efficiency (%)^a	References
Strains	Carbon source	Nitrogen source	Bioreactor	Temperature (°C)	Time (h)	Yield (g/L)	Conversion efficiency (%)^a	References
B. amyloliquefaciens LL3	Sucrose (50 g/L)	(NH₄)₂SO₄ (2 g/L)	200 L	37	44	4.4	8.80	Cao et al. (2011)
B. licheniformis A35	Glucose (75 g/L)	NH₄C1 (18 g/L)	Flask	30	120	12.0	16.00	Cheng et al. (1989)
B. subtilis TAM-4	Glucose (75 g/L)	NH₄C1 (18 g/L)	Flask	30	96	22.1	29.47	Ito et al. (1996)
B. subtilis C10	Glucose (80 g/L) Citric acid (20 g/L)	NH₄C1 (10 g/L)	10 L	32	32	27.7	27.70	Zhang et al. (2012)
B. subtilis GXG-5	Glucose (25 g/L)	NH₄NO₃ (25 g/L)	10 L	50	34	19.5	78.00	This study

^aThe conversion efficiency was defined as the ratio of γ-PGA yield and carbon source concentration