Mechanistic Study of the Inhibition of Active Radicals in Coal by Catechin

Xi, Zhilin; Gao, Ke; Guo, Xiangyu; Li, Meitong; Ren, Changxing

doi:10.1080/00102202.2020.1718122

Cited by 19 publications

(7 citation statements)

References 44 publications

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“…These results were in agreement with the findings reported by Xu et al (2020) for 11 identified bound phenolic compounds from IDF fraction of lychee pulp subjected to alkaline hydrolysis. It was also implied by the researchers that varietal difference may also exert its significant effect on compositions and contents of bound phenolics originated from plants (Xi et al, 2021). Previous studies have endorsed that the antioxidant potential of phenolic compounds depends on several factors, such as position and number of hydroxyl groups along with structural configuration of phenolics.…”

Section: Identification Of Bound Phenolic Compounds Of Sdf and Idf Treated By Alkaline Hydrolysismentioning

confidence: 99%

Changes in structural and chemical composition of insoluble dietary fibers bound phenolic complexes from grape pomace by alkaline hydrolysis treatment

Jiang

Ramachandra

et al. 2022

Food Sci. Technol

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This study was aimed at explanation of evolution process of bound phenolics from IDF through structural modifications after alkaline hydrolysis along with free phenolics and functional characteristics. SEM results depicted that IDF with bound phenolics exhibited denser, more compact and tubular shape whereas, the surface features of alkali-hydrolyzed residue exhibited clear fragmentation, wrinkling and porosity on outside surfaces. Microstructure changes due to alkaline hydrolysis caused disintegration of linkages among hemicellulose and cellulose microfibers. As evident from the FTIR spectra, both IDF samples (with phenolic) and alkali-soluble residue (IDF without phenolics) exhibited resemblance in FTIR spectral features and characteristics bonds. Overall, the peak positions of IDF samples and alkali-hydrolyzed residue did not show any significant change, which was indicative of the fact that no major alterations were occurred in crystalline structures of IDF due to alkali-hydrolysis treatment. IDF-bound phenolic complexes showed the highest TPC, ABTS and FRAP than SDF. In IDF alkaline extracts, total 6 phenolic compounds were detected through HPLC. The identified phenolic compounds were as; salicylic acid, chlorogenic acid, syringic acid, epigallocatechin, p-coumaric acid and ferulic acid. These results demonstrated that higher antioxidant activity of dietary fiber would be related to bound phenolics.

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Section: Identification Of Bound Phenolic Compounds Of Sdf and Idf Treated By Alkaline Hydrolysismentioning

confidence: 99%

Changes in structural and chemical composition of insoluble dietary fibers bound phenolic complexes from grape pomace by alkaline hydrolysis treatment

Jiang

Ramachandra

et al. 2022

Food Sci. Technol

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“…Figure a shows the original data obtained from the experiment. According to the fitting results of FTIR, the absorption band of 3700–3100 cm –1 is mainly caused by −OH stretching vibration, as shown in Figure b . The absorption band of 3000–2800 cm –1 is mainly caused by the stretching vibration of aliphatic C–H bonds, as shown in Figure c.…”

Section: Resultsmentioning

confidence: 90%

“…According to the fitting results of FTIR, the absorption band of 3700−3100 cm −1 is mainly caused by −OH stretching vibration, as shown in Figure 1b. 36 The absorption band of 3000−2800 cm −1 is mainly caused by the stretching vibration of aliphatic C−H bonds, as shown in Figure 1c. The obtained four fitting peaks are attributed to asymmetric methyl stretching (2956.429 cm −1 ), asymmetric methylene stretching (2921.22 cm −1 ), aliphatic C−H stretching (2891.916 cm −1 ), and symmetric methylene stretching (2856.349 cm −1 ).…”

Section: Resultsmentioning

confidence: 97%

Quantum Chemistry Calculation Study on Chain Reaction Mechanisms and Thermodynamic Characteristics of Coal Spontaneous Combustion at Low Temperatures

Huo

Zhu

et al. 2021

ACS Omega

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The coal spontaneous combustion phenomenon seriously affects the safety production of coal mines. Aiming at the problem of complex coal molecular structure and incomplete reaction sequences at present, the mechanisms and thermodynamic parameters of coal spontaneous combustion chain reactions were explored by combining experimental detections and molecular simulations. First, the active groups on the surface of coal were obtained by Fourier transform infrared spectroscopy (FTIR), mainly including methyl (−CH3), methylene (−CH2), methyne (−CH), phenolic hydroxyl (−ArOH), alcohol hydroxyl (−ROH), carboxyl (−COOH), aldehyde (−CHO), and ether (−O−), and the coal molecular models containing functional groups and radicals were established. According to the charge density, electrostatic potential, and frontier orbital theories, the active sites and active bonds were obtained, and a series of reactions were given. The thermodynamic and structural parameters of each reaction were explored. In the chain initiation reaction stage, O2 chemisorption and the self-reaction of radicals play a leading role. In this stage, heat gradually accumulates and various radicals begin to generate, where the intramolecular hydrogen transfer reaction of a peroxide radical (−C–O–O·) can produce the key hydroxyl radical (−O·). In the chain propagation reaction stage, O2 and −O· continuously consume active sites to accelerate the reaction sequences and increase the temperature of coal, and index gases such as CO and CO2 generate, causing the chain cycle reactions to gradually form. The chain termination reaction stage is the formation of stable compounds such as ethers, esters, and quinones, which can inhibit the development of chain reactions. The results can further explain the reaction mechanism of coal spontaneous combustion and provide references for the development and utilization of chemical inhibitors.

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“…EGA by simultaneous FTIR-GCMS system has been useful in determining the nature of the gaseous products that evolved during the heating of raw coal and coal-catechin samples. Compared with raw coal, the content of carbon oxide gaseous products released from the coal-catechin sample was significantly reduced at the same temperature [ 221 ].…”

Section: Applications To Coalmentioning

confidence: 99%

On-Line Thermally Induced Evolved Gas Analysis: An Update—Part 1: EGA-MS

et al. 2022

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Advances in on-line thermally induced evolved gas analysis (OLTI-EGA) have been systematically reported by our group to update their applications in several different fields and to provide useful starting references. The importance of an accurate interpretation of the thermally-induced reaction mechanism which involves the formation of gaseous species is necessary to obtain the characterization of the evolved products. In this review, applications of Evolved Gas Analysis (EGA) performed by on-line coupling heating devices to mass spectrometry (EGA-MS), are reported. Reported references clearly demonstrate that the characterization of the nature of volatile products released by a substance subjected to a controlled temperature program allows us to prove a supposed reaction or composition, either under isothermal or under heating conditions. Selected 2019, 2020, and 2021 references are collected and briefly described in this review.

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Mechanistic Study of the Inhibition of Active Radicals in Coal by Catechin

Cited by 19 publications

References 44 publications

Changes in structural and chemical composition of insoluble dietary fibers bound phenolic complexes from grape pomace by alkaline hydrolysis treatment

Changes in structural and chemical composition of insoluble dietary fibers bound phenolic complexes from grape pomace by alkaline hydrolysis treatment

Quantum Chemistry Calculation Study on Chain Reaction Mechanisms and Thermodynamic Characteristics of Coal Spontaneous Combustion at Low Temperatures

On-Line Thermally Induced Evolved Gas Analysis: An Update—Part 1: EGA-MS

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