Structural characterization of lignin from D. sinicus by FTIR and NMR techniques

Abstract

Milled wood lignin (MWL) was isolated from Dendrocalamus sinicus, an abundant bamboo variety in the earth, using Bjorkman method. Elucidation and quantification of the chemical structures for the isolated MWL have been facilitated by employing FT-IR and NMR techniques. The obtained results showed that the MWL consists of syringyl (S), guaiacyl (G), and p-hydroxyphenyl (H) units, indicating it as grass type (HGS) lignin. There is no significant change in structure (i.e. cleavage at α-O-4 ′ and β-O-4 ′ linkage) was observed. NMR techniques indicated that the isolated lignin was rich in β-O-4 ′ aryl ether substructures and syringyl (S) units. Furthermore, the sufficient understanding of the chemical structure of the lignin benefits their effective utilization towards the production of renewable biomass and biofuels.

Solar-assisted fabrication of large-scale, patternable transparent wood

“…on April 15, 2021 http://advances.sciencemag.org/ Downloaded from of lignin (Fig. 2A) (37)(38), indicating that the process preserves the aromatic backbone of lignin despite degrading its chromophore. The peak of 1734 cm −1 is assigned to the carboxyl groups in hemicellulose (xylan/glucomannan).…”

Identification and Classification of Technical Lignins by means of Principle Component Analysis and k‐Nearest Neighbor Algorithm

“…Assignment of bands of technical lignin samples in the IR spectrum. [26][27][28][29] Wavenumber/cm À 1 Softwood, hardwood and straw consist of different proportions of the three monolignols (H, G, S). For example, softwood consist of 90 % G-units, whereas hardwoods are composed of a mixture of G-and S-units.…”

Overview of Ionogels in Flexible Electronics

“…Ionogels are IL-based composites that typically consist of ILs and solid 3D networks. [38][39][40][41][42] Ionogels present the structure of solid-state networks, [43][44][45] in the meantime, they retains salient features of ILs including ionic conductivity, [46][47][48] thermal stability, [49] and wide electrochemical windows. [50] Although the conductivity of ionogels is not as well as that of hydrogels in most instances, due to the high thermal stability of ILs, there are broader application scenarios for ionogels including supercapacitors and lithium batteries at high-temperatures, wearable electronics below 0°C, as well as sensors under extreme conditions (such as vacuum).…”