|
|
The influence of Zn2+ and Fe3+ on lactic acid production by Lactobacillus amylophilus GV6 under open fermentation |
|
|
Abstract This paper studied on the influence of microelements Zn2+ and Fe3+ in the microbial growth metabolism, and confirmed the feasibility of open fermentation in kitchen waste using Lactobacillus amylophilus GV6. In the open fermentation, the added of Fe3+ improved the LDH activity and the lactic acid production arrived to 29.5g/L, this in effect raised 24.2% compared with the condition of without adding any microelements.On the contrary, the added of Zn2+ reduced the activity of ADH, making the the ethanol production accumulated to 6.0g/L, meanwhile,the lactic acid only reached to 17.8g/L. Appropriate amount of Fe3+ could optimize the utilization of starch in the medium, arrive to about 65.7%, which improved 38.5% and 28.1% respectively compared with the conditions of adding Zn2+ and without adding any microelements. Sucrose, maltose, lactose first transformed to glucose and fructose, finally used by Lactobacillus amylophilus GV6.
|
Received: 23 May 2011
|
|
|
|
|
|
|