Abstract
To get rid of the dependence on lactic acid neutralizer, a simple and economical approach for efficient in situ separation and production of l-lactic acid was established by Bacillus coagulans using weak basic anion-exchange resin. During ten tested resins, the 335 weak basic anion-exchange resins demonstrated the highest adsorption capacity and selectivity for lactic acid recovery. The adsorption study of the 335 resins for lactic acid confirmed that it is an efficient adsorbent under fermentation condition. Langmuir models gave a good fit to the equilibrium data at 50 °C and the maximum adsorption capacity for lactic acid by 335 resins was about 402 mg/g. Adsorption kinetic experiments showed that pseudo-second-order kinetics model gave a good fit to the adsorption rate. When it was used for in situ fermentation, the yield of l-lactic acid by B. coagulans CC17 was close to traditional fermentation and still maintained at about 82% even after reuse by ten times. These results indicated that in situ separation and production of l-lactic acid using the 335 resins were efficient and feasible. This process could greatly reduce the dosage of neutralizing agent and potentially be used in industry.
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Acknowledgements
This study was supported by the National Natural Science Foundation of China (51561145015) and the Major Program of the Natural Science Foundation of Jiangsu Higher Education of China (16KJA220004). We also kindly acknowledge partial support from the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
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Zhang, Y., Qian, Z., Liu, P. et al. Efficient in situ separation and production of l-lactic acid by Bacillus coagulans using weak basic anion-exchange resin. Bioprocess Biosyst Eng 41, 205–212 (2018). https://doi.org/10.1007/s00449-017-1858-z
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DOI: https://doi.org/10.1007/s00449-017-1858-z