A comparison of variate pre-selection methods for use in partial least squares regression:A case study on NIR spectroscopy applied to monitoring beer fermentation

McLeod, Georgina, Clelland, Kirsty, Tapp, Henri, Kemsley, E. Katherine ORCID: https://orcid.org/0000-0003-0669-3883, Wilson, Reginald H., Poulter, Graham, Coombs, David and Hewitt, Christopher J. (2009) A comparison of variate pre-selection methods for use in partial least squares regression:A case study on NIR spectroscopy applied to monitoring beer fermentation. Journal of Food Engineering, 90 (2). pp. 300-307. ISSN 0260-8774

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Abstract

This work investigates four methods of selecting variates from near-infrared (NIR) spectra for use in partial least squares (PLS) regression models to predict biomass and chemical changes during beer fermentation. The fermentation parameters studied were ethanol concentration, specific gravity (SG), optical density (OD) and dry cell weight (DCW). The four selection methods investigated were: Simple, where a fingerprint region is chosen manually; CovProc, a covariance procedure where variates are introduced based on the magnitude of the first PLS vector coefficients; CovProc-SavGo, a modification to CovProc where the window size of a Savitzky-Golay filter applied to the spectra is also optimised; and genetic algorithm (GA), where variates are selected based on the frequency of appearance in 8-variate multiple linear regression models found from repeated execution of the GA routine. The analysis found that all four methods produced good predictive models. The GA approach produced the lowest standard error in prediction (SEP) based on leave-one-out cross-validation (LOO-CV), although this advantage was not reflected in the standard error in validation values, SEV, where all four models performed comparably. From this work, we would recommend using the Simple approach if a suitable fingerprint region can be identified, and using CovProc otherwise.

Item Type:	Article
Additional Information:	Funding Information: The authors thank the BBSRC for funding this work and Coors brewery Ltd. for providing the Grolsch lager wort.
Uncontrolled Keywords:	brewing,genetic algorithm,nir spectroscopy,pls regression,variate selection,food science ,/dk/atira/pure/subjectarea/asjc/1100/1106
Faculty \ School:	Faculty of Science > School of Chemistry
Related URLs:	http://www.scopus.com/inward/record.url?...
Depositing User:	LivePure Connector
Date Deposited:	06 Feb 2023 12:30
Last Modified:	06 Feb 2023 12:30
URI:	https://ueaeprints.uea.ac.uk/id/eprint/91030
DOI:	10.1016/j.jfoodeng.2008.06.037

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