Antioxidant activity,quality parameters and mineral content of Portuguese monofloral honeys |
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| Institution: | 1. Laboratory for Residue Control, Department for Veterinary Public Health, Croatian Veterinary Institute, 10000 Zagreb, Croatia;2. Food Control Center, Faculty of Food and Biotechnology, University of Zagreb, 10000 Zagreb, Croatia;3. Laboratory for Culture Media Preparation and Sterilisation, Veterinary Institute Kri?evci, 48260 Kri?evci, Croatia;4. Department for Biology and Pathology of Fish and Bees, Faculty of Veterinary Medicine University of Zagreb, Heinzelova 55, 10000 Zagreb, Croatia;1. Istanbul Technical University, Department of Chemistry, Maslak, Istanbul, Turkey;2. Karadeniz Technical University, Maçka Vocational School, Maçka, Trabzon, Turkey;3. Giresun University, Espiye Vocational School, Espiye, Giresun, Turkey;4. Giresun University, ?ebinkarahisar Technical Sciences Vocational School, Giresun, Turkey;5. Karadeniz Technical University, Faculty of Science, Department of Chemistry, Trabzon, Turkey;1. The House of the Honey, Cabildo de Tenerife, 38630 El Sauzal, Santa Cruz de Tenerife, Spain;2. Área de Nutrición y Bromatología, Departamento de Ingeniería Química y Tecnología Farmacéutica, Universidad de La Laguna, Avda. Astrofísico Francisco Sánchez, s/n, 38206 La Laguna, Tenerife, Spain |
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| Abstract: | Physicochemical properties (pH, free, lactonic and total acidity, electrical conductivity and moisture), main mineral content (potassium, sodium, calcium, magnesium and iron) and antioxidant activity (total phenolics, 1,1diphenyl-2-picrylhydrazyl radical scavenging and ferric reduction antioxidant power) were determined for 39 Portuguese monofloral honeys (rosemary, orange, thyme, arbutus, locust podshrub and heather) with different geographical origins. Portuguese honeys showed good chemical and nutritional qualities fulfilling the criteria described in Directive 2001/110/CE. Potassium was the main mineral component representing 85% of total minerals. The mineral composition of sodium (4.63–200.60 mg/kg), calcium (0.43–72.30 mg/kg), magnesium (3.05–82.20 mg/kg) and iron (below 7.06 mg/kg) were higher for heather, eucalypt and arbutus honeys. Monofloral honeys of arbutus (Arbutus unedo), locust podshrub (Ceratonia siliqua L.) and heather (Erica umbellata) showed higher antioxidant activity with phenolic contents higher than 600 mg gallic acid equivalents (GAE)/kg, a DPPH scavenging activity higher than 50% and a ferric reduction antioxidant power above 600 μM Fe2+. Furthermore, the chemometric analysis revealed that total phenolic content was a crucial variable explaining the antioxidant activity of arbutus and locust podshrub honeys characteristic of the south of Portugal. |
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| Keywords: | Food analysis Food composition Monofloral honey Quality parameters Main mineral content Antioxidant activity Adulteration Food safety |
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