Determination of stable carbon isotope ratio δ13 C by mass spectrometry in Spanish honeys/Análisis del índice isotópico estable δ13C en mieles españolas mediante resonancia magnética nuclear

The range in the δ13C index of the most important Spanish honeys and its protein fraction is determined by use of stable carbon isotope ratio by mass spectrometry. A variation between -27.7‰ (Lavandula stoechasL.) and -23.7‰ (Citrus spp.) is detected, with only 1.4 units of variation in polyfloral honeys. This parameter allows to detect in honey the presence of isomerized high-fructose corn syrups.