<sup>13</sup>C NMR and EPR Spectroscopic Evaluation of Oil Shale Mined Soil Recuperation

Santos, Jenny; Mangrich, Antônio S.; Pereira, Betânia Fraga; Pillon, Clênio Nailto; Novotny, E. H.; Bonagamba, Tito J.; Abbt‐Braun, Gudrun; Frimmel, Fritz H.

doi:10.5935/0103-5053.20130041

Cited by 8 publications

(4 citation statements)

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“…Compound identification in the GC-qMS analysis was performed using retention time and interpretation of the mass spectra (molecular ion [M +• ], base peak and main fragments) in comparison with mass spectra of isolated compounds, computational libraries and literature data [29,30,31,32].…”

Section: Resultsmentioning

confidence: 99%

Assessing Chemical Constituents of Mimosa caesalpiniifolia Stem Bark: Possible Bioactive Components Accountable for the Cytotoxic Effect of M. caesalpiniifolia on Human Tumour Cell Lines

et al. 2015

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Mimosa caesalpiniifolia is a native plant of the Brazilian northeast, and few studies have investigated its chemical composition and biological significance. This work describes the identification of the first chemical constituents in the ethanolic extract and fractions of M. caesalpiniifolia stem bark based on NMR, GC-qMS and HRMS analyses, as well as an assessment of their cytotoxic activity. GC-qMS analysis showed fatty acid derivatives, triterpenes and steroid substances and confirmed the identity of the chemical compounds isolated from the hexane fraction. Metabolite biodiversity in M. caesalpiniifolia stem bark revealed the differentiated accumulation of pentacyclic triterpenic acids, with a high content of betulinic acid and minor amounts of 3-oxo and 3β-acetoxy derivatives. OPEN ACCESSMolecules 2015, 20 4205Bioactive analysis based on total phenolic and flavonoid content showed a high amount of these compounds in the ethanolic extract, and ESI-(−)-LTQ-Orbitrap-MS identified caffeoyl hexose at high intensity, as well as the presence of phenolic acids and flavonoids. Furthermore, the evaluation of the ethanolic extract and fractions, including betulinic acid, against colon (HCT-116), ovarian (OVCAR-8) and glioblastoma (SF-295) tumour cell lines showed that the crude extract, hexane and dichloromethane fractions possessed moderate to high inhibitory activity, which may be related to the abundance of betulinic acid. The phytochemical and biological study of M. caesalpiniifolia stem bark thus revealed a new alternative source of antitumour compounds, possibly made effective by the presence of betulinic acid and by chemical co-synergism with other compounds.

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Section: Resultsmentioning

confidence: 99%

Assessing Chemical Constituents of Mimosa caesalpiniifolia Stem Bark: Possible Bioactive Components Accountable for the Cytotoxic Effect of M. caesalpiniifolia on Human Tumour Cell Lines

et al. 2015

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“…The electron spin and orbital motion interaction analyses showed that the carbonized samples produced using a lower heating rate (5 • C min −1 ) had g = 2.0030, indicating that the unpaired electrons were located closer to the carbon atoms with a low spin-orbit coupling constant and high electronic transition energy. On the other hand, at a heating rate of 10 • C min −1 , the g values tended to increase and reached g = 2.0034, indicating a shift of the unpaired electrons to sites in the molecule closer to the oxygen atoms, which have a higher spin-orbit coupling constant and a lower electronic transition energy [54,55].…”

Section: Epr Spectroscopymentioning

confidence: 99%

Tannin Industry Waste-Derived Porous Carbon: An Effective Adsorbent from Black Wattle Bark for Organic Pollutant Removal

Schultz,

Leal,

Pantano

et al. 2024

Sustainability

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In Brazil, a significant part of the biomass is unused, contributing to environmental pollution. The tannin industry commonly extracts tannins from the bark of Acacia mearnsii or black wattle, leaving a significant residue of 70% (w w−1). This study investigates the conversion of black wattle bark into a porous carbonaceous material to efficiently remove organic pollutants. Using ZnCl2 as a chemical activation reagent, the experiments varied the impregnation time, carbonization rates, and temperatures. Additional experiments aimed to increase the specific surface area (SSA). X-ray diffraction (XRD) analysis showed the formation and removal of ZnO, which increased porosity. Scanning electron microscopy (SEM) showed an irregular morphology with pores. Fourier-transform infrared (FTIR) spectroscopy indicated characteristic bands, and electron paramagnetic resonance (EPR) detected organic free radicals. The SSAs exceeded 1000 m2 g−1, averaging 1360 m2 g−1, with a maximum of 1525 m2 g−1. Micropores (1.4 nm) were consistent. The structure of the material and the high SSA suggest a potential for efficient removal of aromatic impurities by π–π interactions. This approach addresses the issue of biomass waste, provides a solution for environmental remediation, and represents a transformative strategy for biomass utilization.

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“…En EPR se trabaja con el spin electrón excitado mientras que en RMN se usa el spin de núcleos atómicos (Junk, 2012). La ESR se ha usado en estudios de la MOS asociado a recuperación de suelos de explotación petrolera (Santos et al, 2013). Estudios por ESR mostraron que la alta concentración de radicales libres tipo semiquinona en suelo bajo cultivo fue consistente con la frecuente quema realizada antes de sembrar observándose incremento en la aromaticidad de ácidos húmicos (AH) con mayor concentración de radicales libres semiquinona (Melo et al, 2011).…”

Section: Parámetrounclassified

Aplicaciones de técnicas espectroscópicas para el análisis de suelos

2016

Rev. Fac. Cienc. Básicas

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Existe una gran diversidad de técnicas analíticas en el estudio de suelos, siendo las técnicas espectroscópicas las que mayor auge han tenido recientemente ante la necesidad de buscar metodologías que permitan estudiar adecuadamente grandes extensiones de tierra y que sean amigables con el ambiente. Por esto es necesario revisar dentro de las actuales técnicas espectroscópicas usadas en análisis de suelos cual sería la técnica más adecuada para incorporar en los servicios de extensión en suelos en Colombia bajo los lineamientos dados anteriormente. La espectroscopía infrarrojo es la técnica más pertinente para incorporar en los análisis de fertilidad de suelos en Colombia considerando su versatilidad, bajo costo y reproducibilidad. Asociando los datos de IR con el uso de análisis quimiométrico se pueden lograr estimaciones de parámetros edáficos con alto grado de certeza, con lo cual se genera una nueva estrategia de trabajo en laboratorio ambientalmente más amigable.

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¹³C NMR and EPR Spectroscopic Evaluation of Oil Shale Mined Soil Recuperation

Cited by 8 publications

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Assessing Chemical Constituents of Mimosa caesalpiniifolia Stem Bark: Possible Bioactive Components Accountable for the Cytotoxic Effect of M. caesalpiniifolia on Human Tumour Cell Lines

Assessing Chemical Constituents of Mimosa caesalpiniifolia Stem Bark: Possible Bioactive Components Accountable for the Cytotoxic Effect of M. caesalpiniifolia on Human Tumour Cell Lines

Tannin Industry Waste-Derived Porous Carbon: An Effective Adsorbent from Black Wattle Bark for Organic Pollutant Removal

Aplicaciones de técnicas espectroscópicas para el análisis de suelos

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13C NMR and EPR Spectroscopic Evaluation of Oil Shale Mined Soil Recuperation

Cited by 8 publications

References 0 publications

Assessing Chemical Constituents of Mimosa caesalpiniifolia Stem Bark: Possible Bioactive Components Accountable for the Cytotoxic Effect of M. caesalpiniifolia on Human Tumour Cell Lines

Assessing Chemical Constituents of Mimosa caesalpiniifolia Stem Bark: Possible Bioactive Components Accountable for the Cytotoxic Effect of M. caesalpiniifolia on Human Tumour Cell Lines

Tannin Industry Waste-Derived Porous Carbon: An Effective Adsorbent from Black Wattle Bark for Organic Pollutant Removal

Aplicaciones de técnicas espectroscópicas para el análisis de suelos

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¹³C NMR and EPR Spectroscopic Evaluation of Oil Shale Mined Soil Recuperation