Abstract
Structural Characterization and Antioxidant Activity of Lignin Extracted from Ficus Carica L.
Highlights
Lignin is the second most abundant biopolymer on earth containing approximately 15-30% and 12-20% for wood and annual plants, respectively
3.1 Quantitative 13C-NMRTechniques The FSdL and its acetylated derivatives were examined by 13C-NMR spectroscopy
The syringyl, guaiacyl and p-hydroxyphenyl residues were identified by peaks at 152.3, 138.2, 134.4, 133.3, 132.4, 104.5 ppm (S), 152.3, 149.3, 149.0, 147.2, 145.6, 133.4, 132.4, 119.5, 114.9, 111.5 ppm (G) and 129.8, 127.9, 122.7 ppm (H), respectively
Summary
Lignin is the second most abundant biopolymer on earth containing approximately 15-30% and 12-20% for wood and annual plants, respectively. P-coumaryl, coniferyl, and sinapyl alcohols are the three precursors of lignin These monolignols originate, p-hydroxyphenyl, guaiacyl, and syringyl phenylpropanoid units, respectively, when incorporated in lignin macromolecule [3]. Guaiacyl lignins are available in softwoods while contains syringyl and p-hydroxyphenyl structural units can likewise be distinguished. JRM, 2019, vol., no.4 join guaiacyl and syringyl units at comparable levels, and extensive amounts of structural elements got from p-coumaryl alcohol. In these lignins, the presence of p-coumaric and ferulic acid residues is frequently observed. The NMR spectroscopy method was allowed in order to facilitate the investigation into structural aspects of complex lignin polymers. It is important to look fora new path, for example, new natural antioxidant products items which can enhance all the detriment related to well-being and for prosperity, for pharmaceutical and cosmetics industries
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