Effect of Seasonal Storage on Single-Stem Bark Extractives of Norway Spruce (Picea abies)

Increasing the net value of forestry side-streams has both ecological as well economic benefits for emerging biorefining industries. Spruce bark represents one nature’s abundant sources valuable extractives. In this study, impact storage on quality and quantity Norway spruce (Picea abies) extractives was examined a function time, environmental conditions season (i.e., winter or summer). The from stored saw logs extracted with an accelerated solvent extractor (ASE) at 120 °C hexane water. produced extracts were analysed qualitatively quantitatively by gas chromatography flame ionisation detector (GC-FID) high-performance liquid (HPLC) methods. total amount phenolics in water evaluated Folin–Ciocalteu method, while carbohydrate lignin content extractive-free estimated acidic hydrolysis methanolysis. According to results, temperature dramatically influenced chemical composition degradation rate After period 24 weeks, winter-stored log retained 22% more hydrophilic than summer-stored bark. Lipophilic extractives, however, 14% higher during summer. Notably, average monomeric stilbenoids 61% period. initial phenolic significantly winter, but about equal cellulose dry decreased 17% 11% 13% 6% summer, respectively. By contrast, hemicelluloses increased 26% 15% 30% Overall, it demonstrated that seasonal factors greatly affected which should be considered planning stages raw materials procurement chain.