Characterizing the thermal degradation mechanism of two bisphosphoramidates by TGA, DSC, mass spectrometry and first-principle theoretical protocols

Castrejón-Flores, José Luis; Reyna-Luna, Julieta; Flores-Martínez, Yazmin M.; García-Ventura, María Isabel; Zamudio‐Medina, Angel; Franco‐Pérez, Marco

doi:10.1016/j.molstruc.2020.128781

Cited by 4 publications

(2 citation statements)

References 58 publications

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“…All of the DSC measurements were performed by the same person, who was advised to observe the sample surfaces when they had approximately similar moistures. The pans were sealed and heated from 30 to 90 °C at 5 °C/min by using Perkin-Elmer Diamond DSC (Perkin-Elmer, Waltham, MA, USA) based on the method described by Chang et al [ 17 ] and Castrejón-Flores et al [ 29 ]. An empty sample pan was used as a reference, and T O and T P values were determined.…”

Section: Methodsmentioning

confidence: 99%

The Degradation of Intramuscular Connective Tissue In Vitro with Purified Cathepsin L from Bovine Pancreas

Peng,

He,

Teng

et al. 2023

Foods

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To investigate the possible degradation of the intramuscular connective tissue (IMCT) with cathepsin L, isolated IMCTs were incubated with purified cathepsin L in vitro. Here, we prepared purified cathepsin L from bovine pancreas by using DEAE Sephacel, Sephacryl S-100 HR, SP Sepharose FF, and con A-Sepharose affinity chromatography in sequence. An SDS-PAGE analysis of CNBr-digested peptides showed that the degradation of collagen in IMCT could take place on terminal non-helical peptides rather than the triple helix region. Decorin (DCN) was clearly degraded at a pH of 5.0. The TP and TO of intramuscular connective tissue decreased to 41.41 °C and 43.79 °C, respectively. In the cathepsin L treatment of pH 5.0, the decreases in the TP and TO of IMCT were more sensitive than they were at pH 5.5~6.5.

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Section: Methodsmentioning

confidence: 99%

The Degradation of Intramuscular Connective Tissue In Vitro with Purified Cathepsin L from Bovine Pancreas

Peng,

He,

Teng

et al. 2023

Foods

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“…The source data on the thermal behavior of flame retardant are very important for pre-selection of systems. Paper [12] studied the thermal decomposition of two symmetrical bisphosphoramidates, tetraphenylethan-1,2-diilbis (phosphoramidite) 1 and tetraphenylpropan-1.3-diilbis (phosphoramidite) for their use as flame retardant.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Chemical cellulose-based fibers of decreased flammability

Korovnikova

Dubyna

Oliinik

et al. 2020

EEJET

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The studies reported here have made it possible to determine the optimal ways of fire protection, in which the samples of modified complexite have reduced flammability. The sample with the ions of molybdenum (VI), treated with phosphoric acid, had the highest magnitude of oxygen index among five modified samples of the fiber. This is the most fire-protected sample, which contains three types of flame retardants: nitrogen (amidoxime groups of complexite, phosphorus (treatment with phosphoric acid) and molybdenum (VI). The obtained data indicate the chemical interaction of flame retardant with complexite. The morphology of fibers and the process of their destruction are influenced by the introduction of flame retardants. Scanning electronic microphotographs show the existence of a morphological change of the surface at modification of the complexite samples with flame retardant. The introduction of flame retardant into complexite affects the process of thermal destruction of the samples in the air and argon media. At the same time, the introduction of molybdenum (VI) significantly reduces the thermal stability of fibers. It is likely that processes of thermal destruction can be catalyzed by metals both in the air medium and in the argon medium. The magnitudes of order of reaction of thermal decomposition at the transition from a fiber sample treated only with acids to the samples of complexite containing molybdenum (VI) decreases up to 0.38. At the same time, the values of activation energies E, kcal/mol, and the enthalpy of the process of thermal destruction of complexite DH, kcal/mole also decrease. The mechanical properties of fibers at the introduction of flame retardants into the fiber composition change insignificantly. Depending on the composition of flame retardants, rupture load decreases by 6-11 %, lengthening of the samples decreases by 6-16 %. Thus, there are some grounds to suggest that it is possible to create fibrous materials based on cellulose with predetermined properties of reduced flammability

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Considerations and Perspectives on Microplastics in Air as an Emerging Challenge

Shankar,

Sharma,

Gadi

2024

Emerging Contaminants and Associated Treatment Technologies

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Characterizing the thermal degradation mechanism of two bisphosphoramidates by TGA, DSC, mass spectrometry and first-principle theoretical protocols

Cited by 4 publications

References 58 publications

The Degradation of Intramuscular Connective Tissue In Vitro with Purified Cathepsin L from Bovine Pancreas

The Degradation of Intramuscular Connective Tissue In Vitro with Purified Cathepsin L from Bovine Pancreas

Chemical cellulose-based fibers of decreased flammability

Considerations and Perspectives on Microplastics in Air as an Emerging Challenge

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