Abstract
In this study, after screening of eight fungal strains for their ability to produce calcium malate, it was found that Penicillium viticola 152 isolated from marine algae among them could produce the highest titer of calcium malate. At the same time, it was found that corn steep liquor (CSL) could stimulate calcium malate production and 0.5 % (v/v) CSL was the most suitable for calcium malate production. Under the optimal conditions, a titer of calcium malate in the supernatant was 132 g/l at flask level. During a 10-l fermentation, a titer of 168 g/l, a yield of 1.28 g/g of glucose, and a productivity of 1.75 g/l/h were reached within 96 h of the fermentation, and 93.4 % of the sugar was used for calcium malate production and cell growth, demonstrating that the titer, yield, and productivity of calcium malate by this fungal strain were very high and the fermentation period was very short. After analysis of the partially purified product with high-performance liquid chromatography, it was found that the main product was calcium malate. The results demonstrated that P. viticola 152 obtained in this study was the most suitable for developing a novel one-step fermentation process for calcium malate production from glucose on a large scale.
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This research was supported by Hi-Tech Research and Development Program of China (Grant No. 2013BAB01B05).
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Khan, I., Nazir, K., Wang, ZP. et al. Calcium malate overproduction by Penicillium viticola 152 using the medium containing corn steep liquor. Appl Microbiol Biotechnol 98, 1539–1546 (2014). https://doi.org/10.1007/s00253-013-5326-7
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DOI: https://doi.org/10.1007/s00253-013-5326-7