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Correlation between porosity of cork planks before and after boiling using near infrared spectroscopy

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Abstract

The aim of this study was to evaluate the potential of near infrared spectroscopy (NIRS) in predicting the coefficient of porosity of raw and boiled cork samples used mainly for producing cork stoppers for wine bottling. The classification of cork planks is currently performed visually in the last stage of preprocessing after boiling in water. In this study, calibration models have been developed on 279 cork samples before and after boiling. Three models were obtained: one which predicts the coefficient of porosity of unprocessed samples, a second one that predicts porosity in boiled samples and finally a model that predicts the coefficient of porosity of boiled samples from spectra of raw samples. The models obtained showed a coefficient of determination of 0.58, 0.59 and 0.52, respectively. These results show that the modified partial least squares models based on NIRS technology can be used for screening cork porosity, not only at the two stages of processing, but also to predict boiled porosity. This suggests that NIRS technology could be used for determining the coefficient of porosity in boiled cork planks, and could also provide a useful tree selection tool.

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Acknowledgments

This research work has been made possible through the collaboration agreement CC13-045 between INIA-CIFOR and the University of Córdoba in order to carry out joint research activities related to cork quality and cork stopper performance. The NIR data were obtained using NIRS hardware and software by the NIR/MIR Spectroscopy unit of the SCAI at the University of Cordoba. The authors would like to thank the INIA-CIFOR Cork Laboratory assistants Maria Luisa Cáceres, Esteban and Lorenzo Ortiz Buiza for all their work in the laboratory, Florentino González Hernández for his collaboration on this work and Juan Carlos Sánchez González for taking the spectra.

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Authors and Affiliations

  1. INIA-CIFOR, Ctra. de La Coruña, km 7.5, 28040, Madrid, Spain

    Mariola Sánchez-González

  2. NIR/MIR Spectroscopy Unit, Central Service for Research Support, University of Córdoba, Córdoba, Spain

    Juan García-Olmo

  3. Faculty of Agriculture and Forestry Engineering, University of Córdoba, Córdoba, Spain

    Cristina Prades

Authors
  1. Mariola Sánchez-González
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  2. Juan García-Olmo
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  3. Cristina Prades
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Correspondence to Mariola Sánchez-González.

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Sánchez-González, M., García-Olmo, J. & Prades, C. Correlation between porosity of cork planks before and after boiling using near infrared spectroscopy. Eur. J. Wood Prod. 74, 509–517 (2016). https://doi.org/10.1007/s00107-016-1014-5

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  • DOI: https://doi.org/10.1007/s00107-016-1014-5

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