Fig. 6

Analyses of the degradation products of L. japonica roots by the fermentation broth supernatant (FBS) of strain A3. A HPLC analysis of the degradation products. L. japonica roots treated with the pre-inactivated FBS was taken as the control. Mannuronate oligomers from DP1 to DP6 were taken as the standards. The percentage numbers indicate the percentage of the AO area to the total chromatograph area of the AOs. B–D LTQ-Orbitrap-MS analysis of the major peaks in (A) in the negative-ion mode. DP degree of polymerization, AO alginate oligosaccharide