Abstract
Sugar beet pulp pectin is an attractive source for the production of pectic oligosaccharides, an emerging class of potential prebiotics. The main aim of the present work was to investigate a new process allowing to produce pectic oligosaccharides in a continuous way by means of a cross flow enzyme membrane reactor while using a low-cost crude enzyme mixture (viscozyme). Preliminary experiments in batch and semi-continuous setups allowed to identify suitable enzyme concentrations and assessing filtration suitability. Then, in continuous experiments in the enzyme membrane reactor, residence time and substrate loading were further optimized. The composition of the obtained oligosaccharide mixtures was assessed at the molecular level for the most promising conditions and was shown to be dominated by condition-specific arabinans, rhamnogalacturonans, and galacturonans. A continuous and stable production was performed for 28.5 h at the optimized conditions, obtaining an average pectic oligosaccharide yield of 82.9 ± 9.9% (w/w), a volumetric productivity of 17.5 ± 2.1 g/L/h, and a specific productivity of 8.0 ± 1.0 g/g E/h. This work demonstrated for the first time the continuous and stable production of oligosaccharide mixtures from sugar beet pulp using enzyme membrane reactor technology in a setup suitable for upscaling.
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Acknowledgements
The authors acknowledge IGV GmbH (Potsdam, Germany) for providing the sugar beet pulp raw material. Neha Babbar gratefully acknowledges the PhD scholarship Grant from VITO (Mol, Belgium) and University of Parma (Parma, Italy).
Funding
This study was funded by the European commission (FP7, NOSHAN, Grant agreement 312140).
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Elst, K., Babbar, N., Van Roy, S. et al. Continuous production of pectic oligosaccharides from sugar beet pulp in a cross flow continuous enzyme membrane reactor. Bioprocess Biosyst Eng 41, 1717–1729 (2018). https://doi.org/10.1007/s00449-018-1995-z
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DOI: https://doi.org/10.1007/s00449-018-1995-z