Abstract
Many of current bio-based materials are not fully or partly used for material utilization, as the composition of their raw materials and/or possible applications are unknown. This study deals with the analysis of the wood extractives from three different tissue of larch wood: Sapwood mainly from outer part of the log, and sound knotwood as well as dead knotwood. The extractions were performed with an accelerated solvent extractor (ASE) using hexane and acetone/water. The obtained extracts were analyzed by gas chromatography coupled to mass spectrometry (GC-MS). Three various vibrational spectroscopy (FT-RAMAN, FT-IR and FT-NIR) methods reflect the information from the extracts to the chemical composition of the types of wood before the extraction processes. Multivariate data analysis of the spectra was used to obtain a better insight into possible classification methods. Taxifolin and kaempferol were found in larger amount in sound knotwood samples compared to larch wood with high percentage of sapwood and dead knotwood samples. While the extractions of dead knotwood samples yielded more larixol and resin acids than the other larch wood samples used. Based on the chemical composition, three lead compounds were defined for the classification of the different wood raw materials. The vibrational spectroscopy methods were applied to show their potential for a possible distinction of the three types of larch wood tissue. This new insight into the different larch wood extracts will help in the current efforts to use more environmentally friendly raw materials for innovative applications. The connection between the raw materials and extraction yields of the target values is important to transform the results from the laboratory to industry and consumer applications.
Highlights
Regarding the bio-economy and bio-refinery approach, not all substances in the wood are currently used
The amount of total extraction gravimetric yields of the acetone/water solution differed in a range from 3.38 mg/g of dried mixture wood, 27.13 mg/g of dried sound knotwood and 1.53 mg/g of dried dead knotwood
Extractives from variouscan resources larch extraction wood, sound and dead dead were Differences observed by ainGC-MS
Summary
Regarding the bio-economy and bio-refinery approach, not all substances in the wood are currently used. New thinking and techniques are helpful to exploit the huge potential of bio-based products for innovative applications from the laboratory to industry. Different gaps exist and bridges are necessary to use the by-products (e.g., bark) for new applications (e.g., bio-based polymers) and for Polymers 2020, 12, 359; doi:10.3390/polym12020359 www.mdpi.com/journal/polymers. Polymers 2020, 12, x FOR PEER REVIEW. New thinking and techniques are helpful to exploit the huge potential of bio-based. 12, 359 products for innovative applications from the laboratory to industry. Different gaps exist and bridges are necessary to use the by-products (e.g., bark) for new applications (e.g., bio-based polymers) and energy generation [1,2,3,4]. This study deals with the analysis of wood chips from industrial for energy generation
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