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Effectiveness of Different Analytical Methods for the Characterization of Propolis: A Case of Study in Northern Italy
oleh: Radmila Pavlovic, Gigliola Borgonovo, Valeria Leoni, Luca Giupponi, Giulia Ceciliani, Stefano Sala, Angela Bassoli, Annamaria Giorgi
Format: | Article |
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Diterbitkan: | MDPI AG 2020-01-01 |
Deskripsi
Propolis is used as folk medicine due to its spectrum of alleged biological and pharmaceutical properties and it is a complex matrix not still totally characterized. Two batches of propolis coming from two different environments (plains of Po Valley and the hilly Ligurian−Piedmont Apennines) of Northern Italy were characterized using different analytical methods: Spectrophotometric analysis of phenols, flavones and flavonols, and DPPH radical scavenging activity, HPLC, NMR, HSPME and GC−MS and HPLC−MS Orbitrap. Balsam and moisture content were also considered. No statistical differences were found at the spectrophotometric analysis; balsam content did not vary significantly. The most interesting findings were in the VOCs composition, with the Po Valley samples containing compounds of the resins from leaf buds of <i>Populus nigra</i> L. The hills (Appennines) samples were indeed characterize by the presence of phenolic glycerides already found in mountain environments. HPLC−Q-Exactive-Orbitrap<i><sup>®</sup></i>−MS analysis is crucial in appropriate recognition of evaluate number of metabolites, but also NMR itself could give more detailed information especially when isomeric compounds should be identified. It is necessary a standardized evaluation to protect and valorize this production and more research on propolis characterization using different analytical techniques.