Details

Autor(en) / Beteiligte

• Okińczyc, Piotr
• Widelski, Jarosław
• Nowak, Kinga
• Radwan, Sylwia
• Włodarczyk, Maciej
• Kuś, Piotr Marek
• Susniak, Katarzyna
• Korona-Głowniak, Izabela

Titel

Phytochemical Profiles and Antimicrobial Activity of Selected Populus spp. Bud Extracts

Ist Teil von

• Molecules (Basel, Switzerland), 2024-01, Vol.29 (2), p.437

Ort / Verlag

Switzerland: MDPI AG

Erscheinungsjahr

2024

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Buds of poplar trees ( species) are often covered with sticky, usually polyphenol-rich, exudates. Moreover, accessible data showed that some bud extracts may be excellent antibacterial agents, especially against Gram-positive bacteria. Due to the fragmentary nature of the data found, we conducted a systematic screening study. The antimicrobial activity of two extract types (semi-polar-ethanolic and polar-ethanolic-water (50/50; / )) from 27 bud samples of different poplar taxons were compared. Antimicrobial assays were performed against Gram-positive (five strains) and Gram-negative (six strains) bacteria as well as fungi (three strains) and covered the determination of minimal inhibitory, bactericidal, and fungicidal concentrations. The composition of extracts was later investigated by ultra-high-performance liquid chromatography coupled with ultraviolet detection (UHPLC-DAD) and with electrospray-quadrupole-time-of-flight tandem mass spectrometry (UHPLC-ESI-qTOF-MS). As a result, most of the extracts exhibited good (MIC ≤ 62.5 µg/mL) or moderate (62.5 < MIC ≤ 500 µg/mL) activity against Gram-positives and , as well as fungi. The most active were ethanolic extracts from . , . clone 'Robusta', and . × . . The strongest activity was observed for . × . . Antibacterial activity was supposedly connected with the abundant presence of flavonoids (pinobanksin, pinobanksin 3-acetate, chrysin, pinocembrin, galangin, isosakuranetin dihydrochalcone, pinocembrin dihydrochalcone, and 2',6'-dihydroxy-4'-methoxydihydrochalcone), hydroxycinnamic acids monoesters ( -methoxycinnamic acid cinnamyl ester, caffeic acid phenethylate and different isomers of prenyl esters), and some minor components (balsacones).