Analysis of DCM extractable components from hot-pressed hybrid poplar

Abstract

The effects of thermal compression on the organic-soluble material of a uniform wood substrate, hybrid poplar (clone OP-367), has been studied. Poplar veneers were preconditioned to 0% or 8% moisture content and subsequently hot pressed at 150°C, 200°C, and 250°C. The dichloromethane (DCM) extracts were characterized by various hyphenated analyses [gas chromatography-mass spectrometry (GC-MS), analytical pyrolysis (Py-GC-MS), electrospray ionization-mass spectrometry (ESI-MS), and gel permeation chromatography (GPC)]. The yields and composition of extractable compounds were markedly influenced by treatment at 250°C compared to those obtained at lower temperatures. Most importantly, the organic extracts contained a significant portion of lignin-derived compounds after treatment at 250°C.

Lignin valorization by forming thermally stimulated shape memory copolymeric elastomers—Partially crystalline hyperbranched polymer as crosslinks

“…Molar mass of the lignin and D1 prepolymer samples were determined by positive ion ESI‐MS on a LCQ‐Deca instrument (Thermo Quest). Samples were dissolved in methanol (1 mg mL −1 ) containing 1% acetic acid and introduced into the ESI source at a flow rate of 10 μL min −1 . The ion source and capillary voltages were 4.48 kV and 47 V, respectively, at a temperature of 275°C.…”

Production and characterization of bio-oil and biochar from the pyrolysis of residual bacterial biomass from a polyhydroxyalkanoate production process

“…The lipids from the RBB were extracted with CH 2 Cl 2 and quantified according to the method of Osman et al [25]. Carbohydrate content of lipid-free RBB after CH 2 Cl 2 extraction was analyzed as previously described [26,27].…”

Linear viscoelasticity of hot-pressed hybrid poplar relates to densification and to the in situ molecular parameters of cellulose

“…Cellulose crystallinity was determined using both the relative band heights of 1,429/897 cm −1 (Akerholm et al 2004) and relative band areas of 1,375/ 2,900 cm −1 (Nelson and O'Connor 1964a, b). For molecular weight analysis of cellulose, extractive-free wood (Osman et al 2012) was first delignified using NaClO 2 to form holocellulose (Wise et al 1946). The holocellulose samples (20 mg) were derivatized to their tricarbanilate form on reaction with phenylisocyanate in pyridine at 80°C for 48 h and isolated after precipitation with 30 % aqueous methanol (Suckling et al 2001).…”

“…Thermal treatment affects lignin and cellulose as well. Osman et al (2012Osman et al ( , 2013 observed an increase in the dichloromethane extractive content (9 %) in hot-pressed poplar around 250°C, which mainly comprised solubilized lignin. Reduction of lignin molecular weight was induced by lignin depolymerization.…”