20.500.12556/RUL-133090 Wood extractives of Silver fir and their antioxidant and antifungal properties The chemical composition of extractives in the sapwood (SW), heartwood (HW), knotwood (KW), and branchwood (BW of silver fir (Abies alba Mill.) was analyzed, and their antifungal and antioxidant properties were studied. In addition, the variability of extractives content in a centripetal direction, i.e., from the periphery of the stem towards the pith, was investigated. The extracts were analyzed chemically with gravimetry, spectrophotometry, and chromatography. The antifungal and antioxidative properties of the extracts were evaluated by the agar well diffusion method and the diphenyl picrylhydrazyl radical scavenging method. Average amounts of hydrophilic extractives were higher in KW (up to 210.4 mg/g) and BW (148.6 mg/g) than in HW (34.1 mg/g) and SW (14.8 mg/g). Extractives identified included lignans (isolariciresinol, lariciresinol, secoisolariciresinol, pinoresinol, matairesinol) phenolic acids (homovanillic acid, coumaric acid, ferulic acid), and flavonoids epicatechin, taxifolin, quercetin). Secoisolariciresinol was confirmed to be the predominant compound in the KW (29.8 mg/g) and BW (37.6 mg/g) extracts. The largest amount of phenolic compounds was extracted from parts of knots (281.7 mg/g) embedded in the sapwood and from parts of branches (258.9 mg/g) adjacent to the stem. HW contained more lignans in its older sections. Hydrophilic extracts from knots and branches inhibited the growth of wood-decaying fungi and molds. KW and BW extracts were better free radical scavengers than HW extracts. The results of the biological activity tests suggest that the protective function of phenolic extracts in silver fir wood can also be explained by their antioxidative properties. The results of this study describe BW as a potential source of phenolic extractives in silver fir. Abies alba knotwood chromatography lignans antioxidant properties antifungal properties jelka grče kromatografija lignani antioksidativne lastnosti antimikrobne lastnosti true false true Angleški jezik Slovenski jezik Neznano 2021-11-11 08:53:50 2021-11-11 08:53:56 2022-09-12 04:14:48 0000-00-00 00:00:00 2021 0 0 Str. 1-15 no. 21 Vol. 26 2021 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*8 1420-3049 83366403 RAZ_Vek_Viljem_2021.pdf RAZ_Vek_Viljem_2021.pdf 1 9FA8BC5DA7DB48DB29437E257FE7CE48 4f821becba7d43360bab21907443f808b7dedc09e475deb73bd92ff49c0d74ae 8299a49a-42c5-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=150884 https://www.mdpi.com/1420-3049/26/21/6412 Odprti dostop 1 76dbc676-42c4-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=150879 Biotehniška fakulteta 0 0 0