Fig. 2

Effects of inoculum OD on the lipid fermentation performance of lignin by R. opacus PD630. a cell dry weight and lipid concentration. b lipid content and yield. c lignin concentration and weight loss. Fermentation conditions: 1.4-g/l (NH₄)₂SO₄, pH 7.0, 30 °C, 200 rpm, and 96 h. SSC is soluble substrate concentration. Initial 1 the initial lignin concentration at 15-g/l SSC, Initial 2 the initial lignin concentration at 30-g/l SSC