Characteristics of chemical structure of lignin biopolymer from Araucaria relict plant. Questions and answers of evolution

Lyudmila Sergeevna Kocheva; Anatoly Petrovich Karmanov; Mikhail Valerievich Mironov; Vladimir Alexandrovich Belyy; Irina Nikolaevna Polina; Sergey Alexandrovich Pokryshkin

doi:10.1016/j.ijbiomac.2020.05.150

Characteristics of chemical structure of lignin biopolymer from Araucaria relict plant. Questions and answers of evolution

Int J Biol Macromol. 2020 Sep 15:159:896-903. doi: 10.1016/j.ijbiomac.2020.05.150. Epub 2020 May 21.

Authors

Lyudmila Sergeevna Kocheva¹, Anatoly Petrovich Karmanov², Mikhail Valerievich Mironov³, Vladimir Alexandrovich Belyy⁴, Irina Nikolaevna Polina³, Sergey Alexandrovich Pokryshkin⁵

Affiliations

¹ Institute of Geology of the Komi Science Center UB RAS, Pervomaiskaya st. 54, Syktyvkar 167982, Republic of Komi, Russia.
² Institute of Biology of the Komi Science Center UB RAS, Kommunisticheskaya st. 28, Syktyvkar 167982, Republic of Komi, Russia; Syktyvkar Forest Institute, Lenina st. 39, Syktyvkar 167982, Republic of Komi, Russia.
³ Syktyvkar Forest Institute, Lenina st. 39, Syktyvkar 167982, Republic of Komi, Russia.
⁴ Institute of Chemistry of the Komi Science Center UB RAS, Pervomaiskaya st. 48, Syktyvkar 167982, Republic of Komi, Russia. Electronic address: skeyling@yandex.ru.
⁵ Northern Northern (Arctic) Federal University named after MV Lomonosov, Dvina emb. 17, Arkhangelsk 163002, Russia.

PMID: 32445820
DOI: 10.1016/j.ijbiomac.2020.05.150

Abstract

New details of chemical structure of Araucaria lignin are the focus of this paper, since Araucaria is a relict plant which fossils are dated by the Permian period. Quantitative chemical analysis, FTIR, EPR and 2D NMR spectroscopies, Py-GC/MS and nitrobenzene oxidation have been used to characterize the Araucaria lignin. This work highlighted the structural features of the lignin of Araucaria, which distinguish it from modern coniferous (gymnosperm) lignins. This lignin exhibits pronounced paramagnetic properties with the concentration of paramagnetic centers of 3.0 × 10¹⁷ spin/g, the value of g-factor of 2.0036 corresponds to the phenoxyl radical. The Araucaria lignin is apparently unique since it does not belong to the known G, GS or GSH types. For the first time it was quantitatively proven that he lignin of Araucaria was assigned to compositionally heterogeneous GH lignins, which is not typical for modern lignins.

Keywords: Araucaria; Chemical structure; Lignin.

MeSH terms

Biopolymers / chemistry*
Gas Chromatography-Mass Spectrometry
Lignin / chemistry*
Molecular Structure*
Plant Extracts / chemistry*
Spectroscopy, Fourier Transform Infrared

Substances

Biopolymers
Plant Extracts
Lignin