20.500.12556/RUL-164331 Effect of accelerated extraction and sonication on the antioxidant capacity of wood and bark extracts of wet-hearted silver fir (Abies alba Mill.) The aim of this study was to compare the antioxidant capacity of hydrophilic extracts of different tissues of wet-hearted silver fir (Abies alba Mill.) logs. Wet heart is a wood defect of silver fir and lowers the value of wood. The exploitation of extractives could increase utilization and financial returns. The bark, sapwood, heartwood and knotwood were investigated by using two green extraction methods: ultrasound assisted extraction (US) and accelerated solvent extraction (ASE), with aqueous ethanol as solvent. Total extractive content (TEC), total polyphenol content (TPC) and antioxidant capacities (FRAP, DPPH, ABTS) from the extracts were determined and compared. The highest contents of total hydrophilic extractives were measured in knotwood (23.07%, ASE) and bark (10.31%, ASE), and the lowest values were determined for sapwood (2.00%, ASE) and heartwood (3.56%, ASE). The ASE method resulted in significantly higher TPC (0.65–10.58%) than the US (0.46–9.19%) method. Nevertheless, the simplicity of instrumentation and costs can make US also a potential candidate for future extraction and utilization. The highest antioxidant capacities were measured in knotwood (FRAP: 159.75 mg AAE/g, ABTS: 316.15 mg TE/g, DPPH: 189.23 mg TE/g) and bark (FRAP: 159.75 mg AAE/g, ABTS: 126.81 mg TE/g, DPPH: 74.52 mg TE/ g) extracts, prepared with ASE, which complements well the existing literature data on silver fir extractives. The knotwood and bark of wet-hearted silver fir is an abundant source of antioxidant polyphenols, whereas sapwood and heartwood are poor in these extractives and potentially unsuitable for the valorization by the extraction of natural antioxidants. silver fir tree biomass extraction polyphenols antioxidant capacity bela jelka drevesna biomasa ekstrakcija polifenoli antioksidativna kapaciteta true false true Angleški jezik Slovenski jezik Članek v reviji 2024-10-22 14:18:08 2024-10-22 14:18:13 2025-02-12 11:46:29 0000-00-00 00:00:00 2024 0 0 Str. 1479–1490 iss. 5 Vol. 82 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*8 1436-736X 10.1007/s00107-024-02102-1 201192451 s00107-024-02102-1.pdf s00107-024-02102-1.pdf 1 AA89ADD4E8F5BD4FBFA9DDCED8538295 78f5dbbe01e57484ea907d8df8eb03ab8cbd8607d57d2a7e4121ced729d61912 affca0a7-906f-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=194659 https://link.springer.com/article/10.1007/s00107-024-02102-1 1 6e7b9bbc-906f-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=194658 Biotehniška fakulteta 0 0 0