Classification of fossil fuels according to structural-chemical characteristics

Gyul’maliev, A. M.; Golovin, G. S.; Gagarin, S. G.

doi:10.3103/s0361521907050011

Cited by 13 publications

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“…The structural parameter η is a character independent of the molecular mass of a substance, which showed the lowest value for graphite (1; condensed/aromatic nature) and the highest for methane (5; saturated/aliphatic nature) [ 72 ]. The value of η for EAM was 2.36, demonstrating a medium level of condensation/aromatization.…”

Section: Resultsmentioning

confidence: 99%

“…Another independent structural parameter, δ, is an unsaturation criterion with a value ranked in the range from −12.5 (methane) to 16.67 (graphite) [ 72 ]. The melanoidin of E. angustifolium had a δ value of 5.4, close to those of Orthosiphon stamineus melanoidin (5.6) [ 12 ] and black tea melanoidins (4.5–4.8) [ 10 ] with a high level of aromaticity.…”

Section: Resultsmentioning

confidence: 99%

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Water-Soluble Melanoidin Pigment as a New Antioxidant Component of Fermented Willowherb Leaves (Epilobium angustifolium)

2021

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Willowherb (Epilobium angustifolium L., family Onagraceae) is a well-known food and medicinal plant used after fermentation as a source of beverages with high antioxidant potential. Despite this long history of use, only a few papers have described the chemical profile and bioactivity of fermented willowherb tea in general. To understand the basic metabolic differences of non-fermented and fermented E. angustifolium leaves, we used general chemical analysis, high-performance liquid chromatography with photodiode array detection and electrospray ionization triple quadrupole mass spectrometric detection assay, and an isolation technique. As a result, the content of 14 chemical groups of compounds was compared in the two plant materials; 59 compounds were detected, including 36 new metabolites; and a new water-soluble phenolic polymer of melanoidin nature was isolated and characterized. The fundamental chemical shifts in fermented E. angustifolium leaves relate mainly to the decrease of ellagitannin content, while there is an increase of melanoidin percentage and saving of the antioxidant potential, despite the significant changes detected. The strong antioxidative properties of the new melanoidin were revealed in a series of in vitro bioassays, and a simulated gastrointestinal and colonic digestion model demonstrated the stability of melanoidin and its antioxidant activity. Finally, we concluded that the new melanoidin is a basic antioxidant of the fermented leaves of E. angustifolium, and it can be recommended for additional study as a promising food and medicinal antioxidant agent.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Water-Soluble Melanoidin Pigment as a New Antioxidant Component of Fermented Willowherb Leaves (Epilobium angustifolium)

2021

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“…The concentrations of 9 types covalent bonds in coal can be determined by eqn (2)-(10), 21 which can calculate the quantity of the single bond, double bonds, and quasi-double bonds. This method was modied from the work of Gyul'maliev et al, 32 who reported the quantity of the bonds could be determined by half of the unpaired electrons in the system only considering the single bond.…”

Section: Calculation Of Covalent Bond Concentrations Of Model and Hlhmentioning

confidence: 99%

Construction and evaluation of chemical structure model of Huolinhe lignite using molecular modeling

Pan

Liu

et al. 2017

RSC Adv.

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Physicochemical properties and antioxidant activity of melanin fractions from Inonotus obliquus sclerotia

et al. 2012

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Classification of fossil fuels according to structural-chemical characteristics

Cited by 13 publications

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Water-Soluble Melanoidin Pigment as a New Antioxidant Component of Fermented Willowherb Leaves (Epilobium angustifolium)

Water-Soluble Melanoidin Pigment as a New Antioxidant Component of Fermented Willowherb Leaves (Epilobium angustifolium)

Construction and evaluation of chemical structure model of Huolinhe lignite using molecular modeling

Physicochemical properties and antioxidant activity of melanin fractions from Inonotus obliquus sclerotia

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