Abstract
Polymalic acid (PMA) is a water-soluble polyester with many attractive properties for biomedical application. Its monomer l-malic acid is widely used in the food industry and also a potential C4 platform chemical. Cofactor and CO2 donor involved in the reductive routes were investigated for PMA production by Aureobasidium pullulans. Biotin as the key cofactor of pyruvate carboxylase was favor for the PMA biosynthesis. Na2CO3 as CO2 donor can obviously improved PMA titer when compared with no CO2 supplier NaOH, and also exhibit more advantages than the other donor CaCO3 because of its water-soluble characteristic. A combinational process with addition of biotin 70 mg/L and Na2CO3 as the CO2 donor was scaled-up in 50 L fermentor, achieving the high product 34.3 g/L of PMA and productivity of 0.41 g/L h. This process provides an efficient and economical way for PMA and malic acid production, and is promising for industrial application.
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Acknowledgments
This work was supported in part by grants from the National High Technology Research and Development Program of China (863 Program) (No. 2014AA021205), the National Transformation Fund for Agricultural Science and Technology (2012F1003006), Fundamental Research Funds for the Central Universities (XDJK2013B039), and the Ability Program of Chongqing Engineering Research Center for Pharmaceutical Process and Quality Control (CSTC2012 gg-yyjsb10002-33).
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Zou, X., Tu, G. & Zan, Z. Cofactor and CO2 donor regulation involved in reductive routes for polymalic acid production by Aureobasidium pullulans CCTCC M2012223. Bioprocess Biosyst Eng 37, 2131–2136 (2014). https://doi.org/10.1007/s00449-014-1182-9
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DOI: https://doi.org/10.1007/s00449-014-1182-9