pH-Dependent accumulation of anticancer compound on mycelia in fermentation of marine fungus.
The real-time distribution of anticancer 1403C in fermentation broth of marine fungus Halorosellinia sp. was investigated. It was closely related with pH variations, which was, 1403C in the supernatant decreased while that in the mycelia increased with pH rising. There was only 0.5 % of the total 1403C left in the supernatant when pH reached 7.0. The scanning electron microscope then provided information that compounds precipitated on the mycelia when pH rose. Then, the pH-regulation experiments proved that 1403C mainly secreted extracellular and easily dissolved in acidic condition but precipitated and absorbed on the mycelia with the increase of broth pH. Thereby, a pH-regulation strategy was proposed and applied to accumulate 1403C on the mycelia before draw-off of fermentation broth. It significantly simplified purification process and is critical for 1403C preparation of industrial scale.
State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China.
Weiqiang
W
Zhou
Menghao
M
Cai
Ke
K
Na
Chu
C
Shen
Xiaoxu
X
Zhang
Xiangshan
X
Zhou
Wenjie
W
Zhao
Yuanxing
Y
Zhang
D000970:Antineoplastic Agents / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism*; D059001:Aquatic Organisms / Q000254:growth & development / Q000378:metabolism* / Q000648:ultrastructure; D019149:Bioreactors / Q000382:microbiology; D005285:Fermentation; D005590:Fractional Precipitation; D006863:Hydrogen-Ion Concentration; D025282:Mycelium / Q000254:growth & development / Q000378:metabolism* / Q000648:ultrastructure; D013098:Xylariales / Q000254:growth & development / Q000378:metabolism* / Q000648:ultrastructure
D000970:Antineoplastic Agents