Fig. 1

Total ion chromatogram and mass spectrum of the major monosaccharides detected in B. licheniformis. a Sample, represented the processed product of the EPS-producing strain (BL Δupp) to be detected by GC/MS; control, represented processed product of the fermentation medium to be detected by GC/MS; b-1 the mannose was identified by mass spectrum with a matching quality of 94.68% comparing with the NIST-17 Database; b-2 the glucose was identified by mass spectrum with a matching-degree of 90.36% comparing with the Database; b-3 the galactose was identified by mass spectrum with a matching-degree of 91.07% comparing with the database