Characterization of an array of honeys of different types and botanical origins through fluorescence emission based on LEDs

Publication date: 1 August 2018
Source:Talanta, Volume 185
Author(s): Miguel Lastra-Mejías, Albertina Torreblanca-Zanca, Regina Aroca-Santos, John C. Cancilla, Jesús.G. Izquierdo, José S. Torrecilla
A set of 10 honeys comprising a diverse range of botanical origins have been successfully characterized through fluorescence spectroscopy using inexpensive light-emitting diodes (LEDs) as light sources. It has been proven that each LED-honey combination tested originates a unique emission spectrum, which enables the authentication of every honey, being able to correctly label it with its botanical origin. Furthermore, the analysis was backed up by a mathematical analysis based on partial least square models which led to a correct classification rate of each type of honey of over 95%. Finally, the same approach was followed to analyze rice syrup, which is a common honey adulterant that is challenging to identify when mixed with honey. A LED-dependent and unique fluorescence spectrum was found for the syrup, which presumably qualifies this approach for the design of uncomplicated, fast, and cost-effective quality control and adulteration assessing tools for different types of honey.

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