Table 2.

Sugar compositions, fermentative lactic acid production, and conversion efficiency

Strain	Biomass	Start substrate (g)	Reducing sugar after acid hydrolysis			Lactic acid yield (g/g biomass)	Lactic acid production (g lactic acid/L PBR)
			Glucose (%)	Xylose (%)	Total sugar (%)
WT	6.16 ± 0.32	47.15	44.54 ± 1.31	4.03 ± 0.52	48.57 ± 2.01	0.36	2.18
M4	8.22 ± 0.51*	39.28	54.93 ± 1.03*	4.90 ± 0.31*	59.83 ± 1.10*	0.43	3.56

The biomass (g dry weight/L PBR), glucose and xylose contents (%, g/g biomass) of Chlorella sp. GD wild type (WT) and M4 mutant after acid hydrolysis using 4% (v/v) H₂SO₄, as well as the lactic acid production performance of Lactobacillus plantarum 23. The biomass was obtained after 8 days of incubation in 1-L outdoor PBR under 6% CO₂ condition. Data are presented as mean ± SD (n = 3)

* Following the SD indicates significant difference at P < 0.05 using student t test