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. 2017 Nov 25;7:213. doi: 10.1186/s13568-017-0512-0

Table 2.

Comparison of the carbon source cost in different glutamate-independent strains to produce 10 kg γ-PGA

Strains	Carbon source				Cost saving (%)^a
Strains	Types	Price ($ t⁻¹)	Amount (kg)	Cost ($)	Cost saving (%)^a
B. amyloliquefaciens LL3	Sucrose	1054	113.64	119.78	93.75
B. licheniformis A35	Glucose	584	62.50	36.50	79.48
B. subtilis TAM-4	Glucose	584	33.94	19.82	62.21
B. subtilis C10	Glucose	584	28.88	23.18	67.69
B. subtilis C10	Citric acid	875	7.22	23.18	67.69
B. subtilis GXG-5	Glucose	584	12.82	7.49	–

^aRepresented the cost saving proportion of B. subtilis GXG-5 compared with the corresponding strain