Mineral content and botanical origin of Spanish honeys

Abstract

Eleven elements (Zn, P, B, Mn, Mg, Cu, Ca, Ba, Sr, Na and K) were determined by inductively plasma coupled spectrometry in 40 honey samples from different places of Spain and four different botanical origins: Eucalyptus ( Eucalyptus sp.), Heather ( Erica sp.), Orange-blossom (C itrus sinensis) and Rosemary (R osmarinus officinalis). K, Ca and P show the higher levels with average concentrations ranged between 434.1–1935 mg kg −1 for K; 42.59–341.0 mg kg −1 for Ca and 51.17–154.3 mg kg −1 for P. Levels of Cu (0.531–2.117 mg kg −1), Ba (0.106–1.264 mg kg −1) and Sr (0.257–1.462 mg kg −1) are the lowest in all honey samples. Zn (1.332–7.825 mg kg −1), Mn (0.133–9.471 mg kg −1), Mg (13.26–74.38 mg kg −1) and Na (11.69–218.5 mg kg −1) concentrations were found strongly dependent on the kind of botanical origin. Results were submitted to pattern recognition procedures, unsupervised methods such as cluster and principal components analysis and supervised learning methods like linear discriminant analysis in order to evaluate the existence of data patterns and the possibility of differentiation of Spanish honeys from different botanical origins according to their mineral content. Cluster analysis shows four clusters corresponding to the four botanical origins of honey and PCA explained 71% of the variance with the first two PC variables. The best-grouped honeys were those from heather; eucalyptus honeys formed a more dispersed group and finally orange-blossom and rosemary honeys formed a less distinguishable group.