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TitleA novel approach for honey pollen profile assessment using an electronic tongue and chemometric tools
Author(s)Dias, Luís G.
Veloso, Ana C. A.
Sousa, Mara E. B. C.
Estevinho, Letícia
Machado, Adélio A. S. C.
Peres, António M.
Keywordselectronic tongue
multiple linear regression models
simulated annealing algorithm
pollen profile
Issue date5-Nov-2015
PublisherElsevier B.V.
JournalAnalytica Chimica Acta
CitationDias, Luís G.; Veloso, Ana C. A.; Sousa, Mara E. B. C.; Estevinho, Letícia; Machado, Adélio A. S. C.; Peres, António M., A novel approach for honey pollen profile assessment using an electronic tongue and chemometric tools. Analytica Chimica Acta, 900, 36-45, 2015
Abstract(s)Nowadays the main honey producing countries require accurate labeling of honey before commercialization, including floral classification. Traditionally, this classification is made by melissopalynology analysis, an accurate but time-consuming task requiring laborious sample pre-treatment and high-skilled technicians. In this work the potential use of a potentiometric electronic tongue for pollinic assessment is evaluated, using monofloral and polyfloral honeys. The results showed that after splitting honeys according to color (white, amber and dark), the novel methodology enabled quantifying the relative percentage of the main pollens (Castanea sp., Echium sp., Erica sp., Eucaliptus sp., Lavandula sp., Prunus sp., Rubus sp. and Trifolium sp.). Multiple linear regression models were established for each type of pollen, based on the best sensors sub-sets selected using the simulated annealing algorithm. To minimize the overfitting risk, a repeated K-fold cross-validation procedure was implemented, ensuring that at least 10-20% of the honeys were used for internal validation. With this approach, a minimum average determination coefficient of 0.91 ± 0.15 was obtained. Also, the proposed technique enabled the correct classification of 92% and 100% of monofloral and polyfloral honeys, respectively. The quite satisfactory performance of the novel procedure for quantifying the relative pollen frequency may envisage its applicability for honey labeling and geographical origin identification. Nevertheless, this approach is not a full alternative to the traditional melissopalynologic analysis; it may be seen as a practical complementary tool for preliminary honey floral classification, leaving only problematic cases for pollinic evaluation.
Publisher version
AccessOpen access
Appears in Collections:CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series

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