Abstract
Clustering hybrid regression (CHR) approach was developed and evaluated using data from H2-producing glucose-based, suspended-cell bioreactor operated for 5 months. The aim was to describe the relationship between metabolic end products and H2-production rate. Self-organizing maps (SOM) were used to better visualize the dataset and to detect main metabolic patterns in bioprocess data. SOM detected three distinct metabolic patterns with butyrate, acetate and ethanol as dominant metabolites, respectively. Butyrate dominated metabolism was related to high H2 production, while acetate and ethanol dominated metabolisms resulted in low H2 production. CHR models performed well [mean square error (MSE) 0.55 and 0.56] in modeling the H2-production rate. The results validate the suitability of the CHR approach in describing the bioprocess behavior and in the modeling of H2 production rate. The developed model can help in discovering key metabolic interactions and suitable process parameters from complex datasets, and increase the understanding of the bioprocesses occurring in engineered and natural environments.
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Acknowledgments
This research was funded by the Academy of Finland (HYDROGENE project, no. 107425), Nordic Energy Research (BIOHYDROGEN project, no. 28–02) and Tampere University of Technology Graduate School (P. E. P. Koskinen). The work was also supported by the Academy of Finland (application number 213462, Finnish Programme for Centers of Excellence in Research 2006–2011). The technical assistance of Soong Linhao and Aino-Maija Lakaniemi is highly acknowledged.
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Nikhil, Koskinen, P.E.P., Visa, A. et al. Clustering hybrid regression: a novel computational approach to study and model biohydrogen production through dark fermentation. Bioprocess Biosyst Eng 31, 631–640 (2008). https://doi.org/10.1007/s00449-008-0213-9
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DOI: https://doi.org/10.1007/s00449-008-0213-9