Identification and quantification of lignin monomers and oligomers from reductive catalytic fractionation of pine wood with GC x GC – FID/MS was written by Dao Thi, Hang;Van Aelst, Korneel;Van den Bosch, Sander;Katahira, Rui;Beckham, Gregg T.;Sels, Bert F.;Van Geem, Kevin M.. And the article was included in Green Chemistry in 2022.Quality Control of 4-Hydroxy-3-methoxyphenethanol The following contents are mentioned in the article:
Thorough lignin characterization is vital to understand the physicochem. properties of lignin and to evaluate lignocellulose biorefinery processes. In this study, an in-depth characterization of lignin oil, obtained from reductive catalytic fractionation (RCF) of pine wood, was performed with quant. GC x GC – FID anal. and qual. GC x GC – MS. By utilizing high-temperature resistant column sets in the GC x GC system and by applying a derivatization step, unambiguous detection of lignin monomers, dimers, and trimers is enabled. In addition to confirm the identity of eleven monomers, corresponding to 34 wt% of the RCF lignin oil, thirty-six dimers (16 wt%) and twenty-one trimers (7 wt%) were comprehensively identified by anal. of their mass spectra and quantified by a FID, encompassing the identity of an addnl. 23 wt% of the RCF lignin oil. The proposed structures reveal the interlinkages present in the dimeric and trimeric oligomers, containing β-5, β-1, β-β, 5-5, and a minor fraction of β-O-4 and 4-O-5 bonds. Furthermore, aliphatic end-units in the dimeric and trimeric mols. were identified, consisting of various substituents at the C4 position, that have been previously observed in the RCF-derived lignin monomers. To reduce complexity for anal., the RCF oil was separated into six fractions, prior to anal. The structural motifs (inter-unit linkages and end-units) that are found in the different fractions vary significantly, such that the lignin fractions extracted in more polar solvents contained higher mol. weight fragments and more hydroxyl containing structural motifs. The identified structures of individual dimer and trimer mols. by GC x GC align well with and further complement the recent findings from 1H-13C HSQC NMR spectroscopy, demonstrating complementarity between both 2D techniques to obtain a holistic view on both the mol. structures and the distribution of bonds and end-units in RCF oil. The combination of these two techniques provides a powerful tool for future RCF and other lignin depolymerization research. This study involved multiple reactions and reactants, such as 4-Hydroxy-3-methoxyphenethanol (cas: 2380-78-1Quality Control of 4-Hydroxy-3-methoxyphenethanol).
4-Hydroxy-3-methoxyphenethanol (cas: 2380-78-1) belongs to ethers. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Because of their lack of hydrogen-bond-donating ability, esters do not self-associate. Consequently, esters are more volatile than carboxylic acids of similar molecular weight.Quality Control of 4-Hydroxy-3-methoxyphenethanol
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Ether | (C2H5)2O – PubChem