Abstract
The study aim was the examination whether the correlation between colour characteristics of CIE L*a*b* system and mineral composition can be established in bee honeys. The study was conducted on 34 honeys of different origin, including acacia (n = 7), deciduous honeydew honey (n = 7), raspberry (n = 6), multifloral (n = 9), and rape (n = 5) samples, collected from apiaries located in Lublin region in 2016 season. The concentration of 7 minerals (K, Na, Ca, Mg, Fe, Zn and Mn) and colour characteristics according to CIE L*a*b* were determined. The negative Spearman’s correlation between all minerals and lightness L* (–0.25 £ rS £ –0.62) or hue h° (–0.36 £ rS £ –0.71), but positive with redness a* (0.40 £ rS £ 0.63) were found. With an increase of L* significantly (p £ 0.005) decreasing of K and Mn concentrations (R2 = 0.84 and R2 = 0.89, respectively), as well the total of minerals (R2 = 0.85) were stated. Moreover, such negative relationship was found for hue (h°) (0.86 ≤ R2 ≤ 0.91), but reverse dependence (i.e. positive) was observed for redness (a*) (0.96 ≤ R2 ≤ 0.99). The results of these preliminary surveys, indicate the potential use of selected characteristics of CIE L*a*b* colour system for indirect determination of certain minerals in honey.
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