D’Orsi, Rosarita published the artcileKumagawa and Soxhlet Solvent Fractionation of Lignin: The Impact on the Chemical Structure, Quality Control of 91-16-7, the publication is ACS Omega (2022), 7(29), 25253-25264, database is CAplus and MEDLINE.
We investigated the effects of solvent fractionation on the chem. structures of two com. tech. lignins. We compared the effect of Soxhlet and Kumagawa extraction The aim of this work was to compare the impact of the methods and of the solvents on lignin characteristics. Our investigation confirmed the potentialities of fractionation techniques in refining lignin properties and narrowing the mol. weight distribution. Furthermore, our study revealed that the Kumagawa process enhances the capacity of oxygenated solvents (ethanol and THF) to extract lignin that contains oxidized groups and is characterized by higher average mol. weights Furthermore, the use of THF after ethanol treatment enabled the isolation of lignin with a higher ratio between carbonyl and other oxidized groups. This result was confirmed by attenuated total reflectance-Fourier transform IR spectroscopy (ATR-FTIR), 13C NMR and two-dimensional (2D) NMR spectroscopies, gel permeation chromatog. (GPC), and anal. pyrolysis-gas chromatog.-mass spectrometry (GC-MS) anal. UV-visible (UV-vis) spectra evidenced the enrichment in the most conjugated species observed in the extracted fractions. Elemental analyses pointed at the cleavage of C-heteroatom bonds enhanced by the Kumagawa extraction
ACS Omega published new progress about 91-16-7. 91-16-7 belongs to ethers-buliding-blocks, auxiliary class Benzene,Ether,Inhibitor,Inhibitor,Inhibitor, name is 1,2-Dimethoxybenzene, and the molecular formula is C8H10O2, Quality Control of 91-16-7.
Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem