1. Extraction of Honey Polyphenols: Method Development and Evidence of Isomerization ubertas Academica
- Author
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Bach Kim Nguyen, Nicolas Jacquet, Eric Haubruge, Thomas Berchem, Thibaut Istasse, and Aurore Richel
- Subjects
Pinocembrin ,lcsh:QD71-142 ,business.industry ,Extraction (chemistry) ,lcsh:Analytical chemistry ,04 agricultural and veterinary sciences ,Biology ,040401 food science ,Biochemistry ,Eucalyptus ,Analytical Chemistry ,Biotechnology ,Medical Laboratory Technology ,chemistry.chemical_compound ,0404 agricultural biotechnology ,chemistry ,Polyphenol ,Nectar ,Solid phase extraction ,Food science ,Kaempferol ,business ,Quercetin - Abstract
Honey polyphenols have been studied with the objective of relating honeys to their floral sources. Initially synthesized by plant, these polyphenols can be found in the plant's nectar, which are collected by bees, which convert the nectar into honey. Consequently, polyphenols constitute minor components of honey. The development of a solid-phase extraction method for honey polyphenols is presented in this study. The technique employs Amberlite XAD-2 adsorbent and was tested on monofloral honeys from six different plants: acacia, chestnut, eucalyptus, thyme, sunflower, and wild carrot. Analyses were performed using high-performance liquid chromatography coupled with UV detection and mass spectrometry. Several phenolic acids and flavonoids were identified: caffeic and p-coumaric acids, quercetin, kaempferol, naringenin, chrysin, and pinocembrin. Generally, the quantity of a given polyphenol in the honey was around 0.2 mg/100 g of honey, except for chestnut honey, which contained around 3.0 mg of p-coumaric acid/100 g of honey. Analyses highlighted significant formation of cis isomers for phenolic acids during the extraction despite protection from light.
- Published
- 2016