Table 3.

Comparison of different alternative substrates for levan production.

Microorganism	Sucrose Based medium	Alternative complex medium	Product yield (g levan/g substrate) (levan concentration in g/L)		References
			From sucrose based medium	From alternate substrate
Bacillus subtilis MTCC 441	100 g/L	SJ (100 g/L) + CFP (Nitrogen source)	0.39 (39 g/L)	0.32 (32 g/L)	Present study
Bacillus lentus V8 strain	250 g/L	Sugarcane molasses (250 g/L)	0.23 (57.5 g/L)	0.20 (50 g/L)	[31]
Leuconostoc citreum BD1707		Tomato juice + sucrose (150 g/L)		0.19 (28.5 g/L)	[33]
Bacillus licheniformis NS032	200 g/L	Sugar beet molasses (140 g/L)+ Sucrose (60 g/L)	0.26 (52 g/L)	0.27 (54 g/L)	[32]
Bacillus polymyxa (NRRL-18475)	250 g/L	Sugarcane molasses (250 g/L)	0.14 (35 g/L)	0.03 (7.5 g/L)	[14]
		Sugarcane syrup (250 g/L)	N.A.	0.08 (20 g/L)
Halomonas sp. AAD6		Pretreated Sugar beet molasses (30 g/L)	N.A.	0.41 (12.3 g/L)	[13]
		Starch molasses (30 g/L)	N.A.	0.15 (4.5 g/L)
Microbacterium levaniformans	200 g/L	Date syrup (250 g/L)	0.25 (50 g/L)	0.04 (10 g/L)	[12]
Zymomonas mobilis	250 g/L	Sugarcane molasses (250 g/L)	0.09 (22.5 g/L)	0.01 (2.5 g/L)	[15]
		Sugarcane syrup (250 g/L)	N.A.	0.06 (15 g/L)

Note: N.A. Not available.