Purification of lactic acid obtained from a fermentative process of cassava syrup using ion exchange resins

In this article, the fermentative lactic acid (LA) production and its further separation by ionic exchange resins was evaluated. A Lactobacillus brevis strain was used to perform lab scale experiments under anaerobic conditions, using a low nutritional content media with cassava flour as carbon source (HYI). For a fermentation time of 120h in a 7.5-L bioreactor, the LA concentration was 24.3 plus or minus 0.07g LA/L and productivity 0.20 g/L/h, at pH 6.5 and 38 degrees Celsius. For LA recovery, the Amberlite IRA-400 and IR-120 exchange resins were used. First of all, an LA isothermal adsorption on Amberlite IRA-400, C1., OH and HSO... activated form was performed at 25 degree Celsius. The C1-activated resin was tested at pH 5, whereas the OH-activated form was tested at pH 3.5 and 6.3. The highest adsorbate content was 0.59 plus or minus 0.03 g LA/g resin at pH 6.3 when the resin was OH activated. (ProQuest: ... denotes formulae/symbols omitted.)