摘要
The optimization of fermentation medium is important for synthetic biological secondary metabolite productions.The effect of rotation speed,inoculum amount,and medium supplements on the cell growth and Lycogen^TM secretion of photobacterium Rhodobacter sphaeroides WL-APD911 was evaluated.The results reveal that a higher rotational speed exhibit a higher cell density,and the increasing in the amount of inoculum amount show a slight augment on the growth of R.sphaeroides WL-APD911.In the case of nitrogen sources adding,Lycogen^TM production was achieved with a 0.5 mM l-lysine supplementation.Moreover,the attention of Tween 80 presented a tremendous increase in the secondary metabolite.Response surface methodology(RSM)exhibited the optimization of medium supplements for Lycogen^TM invention is accomplished at molasses concentration of 10 g/L,yeast extract concentration of 40 g/L,0.3%Tween 80 and NaCl concentration of 5 g/L,respectively.Further,the batch fermentation is carried out in both 5 L and 20 L fermentors to study the scale-up process factors to be adopted.At a 20 L fermentor,Lycogen^TM yields under the optimal culture condition are over 2 times than in the shake flask.The present results provide the Lycogen^TM optimal culture mediums,scale-up procedures and efficient extractions from R.sphaeroides WL-APD911.
基金
This work was supported by grants from the Ministry of Science and Technology,Taiwan,ROC(MOST 104-2221-E-005-096-MY2,and MOST 104-2628-E-005-004-MY3).We thank the projects of Center for Stem Cell Research,Kaohsiung Medical University,Kaohsiung,Taiwan,KMU-TP104G00 and KMU-TP104G02-05.The financial supports were also from KMU-DK105005 and NSYSUKMU105-P 007.
