Czech J. Food Sci., 2019, 37(3):199-204 | DOI: 10.17221/202/2018-CJFS

Discrimination of flax cultivars based on visible diffusion reflectance spectra and colour parameters of whole seedsFood Analysis, Food Quality and Nutrition

Yana Troshchynska^*,1, Roman Bleha², Lenka Kumbarová², Marcela Sluková², Andrej Sinica², Jiří Štětina¹

¹ Department of Dairy, Fat and Cosmetics, Faculty of Food and Biochemical Technology, University of Chemistry and Technology in Prague, Prague, Czech Republic

² Department of Carbohydrates and Cereals, Faculty of Food and Biochemical Technology, University of Chemistry and Technology in Prague, Prague, Czech Republic

Discrimination of yellow and brown seeded flax cultivars was made based on visible (Vis) diffusion reflectance spectra of whole seeds. Hierarchy cluster analysis (HCA) and principal component analysis (PCA) were used for the discrimination. Multivariate analyses of Vis spectra led to satisfactory discrimination of all flax cultivars of this study. The CIE L*a*b* colour parameters were calculated from the diffusion reflectance Vis spectra. The values of L* were in the range of 48.8-53.6 and 62.6-66.0% for brown and yellow seeded cultivars, respectively. Chromatic parameters a* and b* were in the range of 2.8-4.9 and 7.9-16.4%, respectively. A strong linear correlation (R₂ = 0.9712) was found between a* and b* parameters for all the flaxseed samples. The L* and a* parameters were sufficient for HCA clustering of the individual flax cultivars.

Keywords: colour space; electronic spectroscopy; flaxseed; multivariate statistics

Published: June 30, 2019  Show citation