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Additional file 1 of one-pot synthesis of fuel precursor from acetoin fermentation broth using ionic liquid-based salting-out extraction system : Fig. S1 GC analysis of the aldol condensation reaction of acetoin and 5-MF. tR 6.653 min, 5-MF; tR 13.506 min, Product I; tR 15.562 min, Product II; tR 16.555 min, Product III; tR 17.846 min, Product IV; tR 14.687 min, imine intermediate. Fig. S2 GC–MS diagram of the four C10 products and intermediate. A Product Ipent-1-en-3-one); B product IIpentan-3-one); C product IIIpent-4-ene-2,3-dione); D product IVpent-1-en-3-one); E intermediatemethylene)amino)ethan-1-ol). Fig. S3 1H NMR spectra of product IV synthesized from 5-MF and AC. Fig. S4 1H NMR spectra of intermediate.