Quality control of natural cork stoppers by image analysis and oxygen transmission rate
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María Consuelo Díaz-Maroto
,
Manuel López-Viñas
Abstract
This work presents the evaluation of the porosity by image analysis, the quantitative analysis of the cell morphology from images obtained by scanning electron microscopy (SEM) and the oxygen transmission rate (OTR) of natural corks of different visual quality grades. Due to the natural variability of cork stoppers, statistically significant differences could not be established in the porosity of the corks according to their commercial quality. However, the determination of the surface porosity coefficient by image analysis in the tangential and axial sections of the corks allowed us to distinguish between high, medium and low quality classes. The cells in the tangential section were shaped between circular and hexagonal, with very regular perimeters regardless of the cork quality. While the cells of the radial and axial sections showed a square and rectangular shape, with more irregular perimeters, mainly in the lowest quality corks and in the axial section. Corks commercially classified as “flower”, “second” and “third” had the lowest OTR values and presented a similar statistical distribution in their cell perimeters in the axial section. While the corks with higher OTR values (superior and fourth qualities) corresponded with those with greater cell perimeters and greater dispersion in their distribution.
Funding source: Junta de Comunidades de Castilla-La Mancha
Award Identifier / Grant number: Project SBPLY-17-180501-000445
Acknowledgements
The authors thank to Sergio Guerra López for the development of the software for porosity measurements.
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: This research was funded by Junta de Comunidades de Castilla-La Mancha (JCCM, Spain), Project SBPLY-17-180501-000445.
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Conflict of interest statement: The authors declare that they have no conflicts of interest regarding this manuscript.
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Articles in the same Issue
- Frontmatter
- Original Articles
- Variation analyses of extractive contents by NIR-spectroscopy bring out the differences between agroforestry and forestry walnut (Juglans regia × nigra) trees
- Correlation between lignin content and syringyl-to-guaiacyl (S/G) ratio of Eucalyptus globulus wood
- Accelerated relaxation behavior during water desorption in the mechano-sorptive creep of wood: modeling and analysis based on the free volume concept and Kohlausch–Williams–Watts function
- Degradation of beech wood by Kretzschmaria deusta: its heterogeneity and influence on dynamic and static bending properties
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- Artificial lignification of a cellulose microfibril-based hydrogel and resulting effect on tensile properties
- Depolymerisation of kraft lignin to obtain high value-added products: antioxidants and UV absorbers
- A CP/MAS 13C NMR investigation of cellulose ultrastructure in traditional Chinese handmade papers
- Quality control of natural cork stoppers by image analysis and oxygen transmission rate
