Biosurfactant-Producing Lactobacilli: Screening, Production Profiles, and Effect of Medium Composition

Table 4

Biomass concentrations (gL⁻¹) and surface tension reductions (mN m⁻¹) obtained for L. paracasei ssp. paracasei A20 supernatants (excreted biosurfactant) and PBS extracted solutions (cell-bound biosurfactant). MRS-Lac-E-20: 20 gL⁻¹ lactose; MRS-Lac-E-30: 30 gL⁻¹ lactose; MRS-Lac-E-40: 40 gL⁻¹ lactose; and MRS-Lac-E-50: 50 gL⁻¹ lactose. Results represent the average of three independent experiments ± standard deviation.

	Reduction of culture broth surface tension; (mN m^−1)	Reduction of PBS surface tension; (mN m^−1)	Biomass; (gL^−1)
Flask
MRS-Lac	6.4±0.4	21.8±0.4	2.446
Reactor (without aeration)
MRS-Lac	3.5±0.5	14.5±0.6	2.100
MRS-Lac II	6.4±0.2	22.5±0.4	3.478
MRS-Lac III	6.0±0.5	22.0±0.1	3.408
MRS-Lac-E-20	3.6±0.2	14.3±0.3	1.243
MRS-Lac-E-30	5.2±0.3	18.5±0.6	2.056
MRS-Lac-E-40	6.6±0.7	21.7±0.5	2.867
MRS-Lac-E-50	7.8±0.4	24.7±0.3	3.328
Reactor (with aeration)
MRS-Lac II	5.9±0.5	18.9±0.1	4.170