Application of fourier transform infrared spectroscopy for the study of lignins of herbaceous plants

Карманов, А. П.; Derkacheva, O. Yu.

doi:10.1134/s1068162013070066

Cited by 12 publications

(14 citation statements)

References 6 publications

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“…Composites comprising different concentrations of lignin were synthesized and the influence of biopolymer/pyrrole ratio on the total charge storage performance was evaluated, as depicted in Figure 1B. 41 A weak band near 1369 cm -1 can be assigned to aromatic skeletal vibration combined with C-H in-plane deformation of syringyl (S) and guaiacyl (G) units. However, different concentrations of Lig/Py solutions can slightly affect the total performance of the resulting PPy/Lig composite.…”

Section: Ex Situ Spectroelectrochemical Measurementsmentioning

confidence: 99%

“…Results indicate that there was an improvement of up to 20% of the total capacity, reaching an optimum at the biopolymer/pyrrole mass ratio at 1.5:1. 40 The peak at 1050 cm -1 can be due to C-O stretch of aryl-O-CH 3 and aryl-OH of GS lignin 46 , skeletal vibrations of aromatic units, or C-H and C-O deformations, and have been associated also with other modes, 40,41 but it is difficult to distinguish them from each other. 42 Bands at 1599 and 1504 cm -1 are due to aromatic ring skeletal vibrations, and bands at 1464, 1452 and 1427 cm -1 are attributed to aromatic skeletal vibrations combined with methyl and methylene C-H deformations.…”

Section: Ex Situ Spectroelectrochemical Measurementsmentioning

confidence: 99%

“…35 The power of in-situ spectroelectrochemical Fourier-transform infrared (FTIR) spectroscopy is in the direct observation of structural and electronic changes taking place during electrochemical reactions, due to changes between different oxidation states. 40,41 HClO 4 (Merck), containing different concentrations (1.7, 5.0, 7.5, and 15 g L -1 ) of lignin derivative in the form of lignosulfonates (LC30, M w =13400, MeadWestvaco). Experimental developments have been accompanied by calculations of vibrational spectra, 36,37 where, for example, Tian and Zerbi 38,39 investigated spectra of reduced and oxidized forms of polypyrrole, suggesting benzoid structure of reduced and quinoid structure of oxidized polypyrrole.…”

Section: Introductionmentioning

confidence: 99%

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Spectroelectrochemical investigation of redox states in a polypyrrole/lignin composite electrode material

et al. 2015

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We report spectroelectrochemical studies to investigate the charge storage mechanism of composite polypyrrole/lignin electrodes. Renewable bioorganic electrode materials were produced by electropolymerization of pyrrole in the presence of a water-soluble lignin derivative acting as dopant. The resulting composite exhibited enhanced charge storage abilities due to a lignin-based faradaic processes, which was expressed after repeated electrochemical redox of the material. The in-situ FTIR spectroelectrochemistry results show the formation of quinone groups, and the reversible oxidation-reduction of these groups during charge-discharge experiments in the electrode materials. The most significant IR bands include carbonyl absorption near 1705 cm -1 , which is attributed to the creation of quinone moieties during oxidation, and absorption at 1045 cm -1 which is due to hydroquinone moieties.after the discovery of metallic polyacetylene by Shirakawa, McDiarmid, Heeger, et al. 10 A strong interest in the development of new storage devices emerged at this time. The benefits of conductive polymers are their high electrical conductivity, processability, low cost and electrochemical reversibility. This is due to the presence of fast charge transfer in the polymeric chain, associated with intercalation/deintercalation of counter-ions during the redox process. 11,12 For many of these reasons, polypyrrole (PPy) seems to be a good candidate for this purpose, as one of the more stable materials, with relatively high theoretical specific capacity 75 mAh g -1 (with dopant) and a specific energy density ranging from 80 to 390 Wh kg −1 . 13,14 However, PPy doped by small, mobile counteranions such as perchlorates, still suffer from self-discharge, from insufficient charge storage density compared to inorganic materials used in secondary batteries, † These authors contributed equally to this work.

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Section: Ex Situ Spectroelectrochemical Measurementsmentioning

confidence: 99%

Section: Ex Situ Spectroelectrochemical Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spectroelectrochemical investigation of redox states in a polypyrrole/lignin composite electrode material

et al. 2015

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“…2 and 3, respectively. The peaks at 1595 cm -1 , 1510 cm -1 , 1459 cm -1 , and 1423 cm -1 in the infrared spectra were corresponding to the skeletal vibrations of the aromatic ring (Karmanov and Derkacheva 2013), and their intensities were similar, which meant that the aromatic structures in the CEL and RCEL preparations were similar. The strength of the peaks at 1361 cm -1 and 1126 cm -1 were assigned to the vibrations of the syringyl units, and at 1264 cm -1 were assigned to the vibrations of the guaiacyl units, were also very similar for CEL and RCEL.…”

Section: Spectral Analysis Of Wheat Leaf Cel and Rcelmentioning

confidence: 92%

Characterization of Lignin Isolated from Wheat Leaf Based on LiCl/DMSO Dissolution and Regeneration

Cao

Jiang

et al. 2016

BioResources

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The isolation of lignin is of great importance to understand its structural characteristics. A lithium chloride/dimethyl sulfoxide (LiCl/DMSO) solvent system has been developed for the dissolution of lignocellulose and for the isolation of lignin for this purpose. In this work, ball-milled wheat leaf (sheath included) was dissolved in the LiCl/DMSO solvent system and then regenerated in water. Two lignin preparations, cellulolytic enzyme lignin from the ball-milled leaf (CEL) and from the regenerated leaf (RCEL), were obtained through a cellulolytic enzyme lignin procedure. The RCEL and CEL were comparatively investigated by the use of wet chemistry and spectroscopic methods. The results indicate that the effects of ball milling and regeneration on the aromatic structure and β-O-4' linkages of lignin were not significant. The RCEL had a higher isolation yield and purity, but a similar structure with the corresponding CEL. The RCEL can be used for structural analysis.

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“…By quantitative analysis of IR-spectra and construction of calibration dependencies similar "structure-properties" the tasks of finding the most informative absorbance bands to characterize chemical structure of native lignins are quite successfully solved [3][4][5][6][7]. In order to increase the reliability of the interpretation of IR spectra there is a necessity of the comparative analysis of the experimental and theoretical data.…”

mentioning

confidence: 99%

Calculation of IR-spectra of structural fragments of lignins

Derkacheva¹,

Ishankhodzhaeva²

2016

EPJ Web Conf.

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Abstract. To study structure of softwood lignins the experimental and theoretical IR-spectra in middle IR-diapason were analyzed. To interpret these data the quantum chemical calculations of IR-spectra of general dimmer fragments of softwood lignins by method of density functional theory (DFT/B3LYP) with 6-31G(d,p) as basis set were carried out. These calculations showed that frequencies of normal vibrations of fragment with E-alkyl-aryl linkage are close to the experimental values of the IR absorption bands of lignin, and infrared spectrum of this structure is similar to the experimental spectrum of lignin. The calculations with accounting for the solvent showed a strong increase in the intensity of the majority of the bands and the solvent effect on the frequencies of vibrations.Lignins, being part of the plant raw, are valuable source of chemical compounds [1]. It is why heightened interest to decoding native lignin structure is saved. Lignin is not individual substance. Lignin is mixture of irregular aromatic polymers of close structure. Therefore the structural formula of lignin does not exist.At the same time it is known that lignins consist of phenylpropane units of guaiacyl, syringyl and p-coumaryl types [2]. Currently it is revealed more than 20 types of linkages between phenylpropane units. It is established that E-alkyl-aryl linkage is the most common one in native lignins.One of useful methods of lignin analysis is FTIR-spectroscopy. By quantitative analysis of IR-spectra and construction of calibration dependencies similar "structure-properties" the tasks of finding the most informative absorbance bands to characterize chemical structure of native lignins are quite successfully solved [3][4][5][6][7]. In order to increase the reliability of the interpretation of IR spectra there is a necessity of the comparative analysis of the experimental and theoretical data. To achieve this aim in the work the quantum-chemical calculations of IR spectra of dimmer models of softwood lignin were carried out by method of density functional theory with the B3LYP functional in the basis of 6-31 + G (d, p) using a software package Gaussian08. IR-spectra were calculated for two main structural elements of guaiacyl lignin.Figure shows the lignin experimental spectrum and the simulated IR spectra of the investigated dimmers in the form of the absorption curves in the frequency range 700 -1900 cm -1 . By comparison with experiment the frequencies of normal vibrations of the

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Application of fourier transform infrared spectroscopy for the study of lignins of herbaceous plants

Cited by 12 publications

References 6 publications

Spectroelectrochemical investigation of redox states in a polypyrrole/lignin composite electrode material

Spectroelectrochemical investigation of redox states in a polypyrrole/lignin composite electrode material

Characterization of Lignin Isolated from Wheat Leaf Based on LiCl/DMSO Dissolution and Regeneration

Calculation of IR-spectra of structural fragments of lignins

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