Fig. 7
The degradation of HA by B. cereus No.1. The degradation kinetic (A) and HPLC chromatogram (B) of standard HA by the bacterium. MS and MS2 spectra scan relative to HA standardat 40 mg/L (C) and its degradation products treated with live bacterium No.1 after 48 h (D). Structures of HA and a possible degradation product HAH2 (E). The live bacterial No.1 was added to the culture medium containing HA (40 μg/mL) and kept at 28 ℃ in the dark at 150 r/min for 2 days