碳源浓度对构菌发酵的影响

构菌发酵过程中 ,pH值由降而升 ,其变化与碳源浓度有关。当葡萄糖浓度为 0 5 %时 ,接种后两天就开始回升 ,第 3天可升至 7 2 8。而浓度 2 %时 ,第 5天pH才升到 6 75。以蔗糖为碳源也有类似结果。因此当需要某范围pH以有利其活性成分产生时 ,碳源浓度应作主要因素考虑

Effect of Carbon Source Concentration on Fermentation of Flammulina velutipes

The pH value of the liquid medium began to shift form decrease to increase during the fermentation of Flammulina velutipes.This shift was relevant to the carbon source concentration.The pH commenced to increase two days later after inoculation of the strain,and on the third day it reached 7 28,when 0 5%(w/v)of glucose was used in the medium.The value of pH 6 75 was observed up to the fifth day when the glucose concentration of the medium was 2%(w/v).Similar results were found when sucrose was as a carbon source. These results suggest that the carbon source concentration should be considered as a main factor if a range of pH was expected to facilitate the production of the active component during the fermentation of Flammulina velutipes.