Differences in Chemical Composition and Antioxidant Activity of Three Propolis Samples Collected in the Same Apiary

Authors : Ana Sofia P FREITAS, Ana João P GOMES, Ana CUNHA, Rui P S OLIVEIRA, Cristina ALMEIDAAGUIAR

Pages : 44-44

View : 9 | Download : 10

Publication Date : 2018-12-08

Article Type : Conference Paper

Abstract :Propolis, a complex mixture of resinous and balsamic material collected by honeybees from plant material and mixed with bees’ salivary secretions, is composed by different groups of compounds that have been linked with diverse bioactivities. In particular, flavonoids, phenolic acids and their esters were associated to valuable biological properties such as antioxidant and free radical scavenging 1,2 . Propolis possess substantial variability of chemical composition and bioactive profiles, even from the same origin but collected in different years 3 . However, Portuguese propolis samples from an apiary named Gerês insert ignore into journalissuearticles values(G);, normally obtained by mixing propolis from three places - Bugalho insert ignore into journalissuearticles values(b);, Toutelo insert ignore into journalissuearticles values(t); and Felgueiras insert ignore into journalissuearticles values(f); - show similar chemical and biological profiles over the years insert ignore into journalissuearticles values(Freitas, under reviewing);. Recently, a new propolis place - Roca insert ignore into journalissuearticles values(r); - was added to the apiary. In this work we have studied three Gerês propolis samples collected in 2017 insert ignore into journalissuearticles values(G17);, but composed by different combinations of source places: G17-r; G17-rt and G17-tf.             Total phenolic, total flavonoid and ortho-diphenol contents were determined for the ethanolic extracts insert ignore into journalissuearticles values(EE); obtained from the three propolis samples and DPPH • scavenging assay was performed to evaluate the in vitro antioxidant capacity of G17.EEs. All propolis samples showed antioxidant capacity, having one of the extracts, namely G17-r.EE, the highest scavenging ability of DPPH • . This extract was also the one with higher content in phenolic, flavonoid and ortho-diphenol compounds. Note: Ana Freitas and Ana Gomes contributed equally to this work.   Acknowledgments: Financial support provided by FCT insert ignore into journalissuearticles values(PD/BD/128276/2017);, under the Doctoral Programme Agrichains - PD/00122/2012.
Keywords : Propolis, Chemical Composition, Antioxidant Activity