Synthesis and characterization of new methacrylate copolymers having pendant chloroacetophenon; monomer reactivity ratio, thermal degradation kinetics and biological activity

2021 ◽  
Author(s):  
Ibrahim Erol ◽  
M. Onur Hoşsöz ◽  
Zeki Gurler
Keyword(s):  
Biological Activity ◽  
Thermal Degradation ◽  
Degradation Kinetics ◽  
Reactivity Ratio ◽  
Thermal Degradation Kinetics ◽  
Synthesis And Characterization ◽  
Monomer Reactivity Ratio ◽  
Methacrylate Copolymers

Synthesis and characterization of novel methacrylate copolymers having pendant piperonyl group: monomer reactivity ratio, thermal degradation kinetics, and biological activity

2021 ◽  
Vol 29 (9_suppl) ◽  
pp. S1432-S1445
Author(s):  
Ibrahim Erol ◽  
Bayram Gencer ◽  
Zeki Gurler
Keyword(s):  
Biological Activity ◽  
Degradation Kinetics ◽  
Gel Permeation Chromatography ◽  
Reactivity Ratio ◽  
Thermal Degradation Kinetics ◽  
Scanning Calorimetry ◽  
Molecular Weights ◽  
Monomer Reactivity Ratio ◽  
Bacteria And Fungi ◽  
Photo Stability

In this study, 2-{[(2H-1,3-benzodioxol-5-yl)methyl]amino}-2-oxoethyl 2-methylprop-2-enoate (BMAOME) monomer was synthesized, and copolymers were prepared with glycidyl methacrylate (GMA). Structural characterizations of the compounds were performed using FTIR, 1H-, and 13C-NMR techniques. Monomer reactivity ratio values were calculated by Finemann–Ross (FR) and Kelen–Tudos (KT) methods. The Tg value of the polymers was determined by differential scanning calorimetry (DSC) and their thermal stability was determined by thermogravimetric analysis (TGA). The molecular weights (w and n) and polydispersity index of the polymers were determined by gel permeation chromatography. The Ea value of thermal decomposition was determined by using the Ozawa and Kissinger methods. The photo-stability of the copolymers was investigated. Furthermore, the photo-stability of the copolymers and the biological activity of polymers against different types of bacteria and fungi were investigated.

The kinetics of thermal degradation of polyphenolic compounds from elderberry (Sambucus nigra L.) extract

2018 ◽  
Vol 24 (4) ◽  
pp. 361-369 ◽  
Author(s):  
Ana-Maria Oancea ◽  
Cristina Onofrei ◽  
Mihaela Turturică ◽  
Gabriela Bahrim ◽  
Gabriela Râpeanu ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Thermal Degradation ◽  
Fluorescence Intensity ◽  
Degradation Kinetics ◽  
Heating Time ◽  
Thermal Degradation Kinetics ◽  
Flavonoid Compound ◽  
Fluorescence Studies ◽  
Catechin Hydrate

This main focus of this study was to evaluate the thermal degradation kinetics and the phytochemical characterization of the elderberries extract. Pelargonidin-3-sophoroside and delphinidin-3-glucoside were identified as the major anthocyanin compounds and catechin hydrate as the major flavonoid compound. In order to further understand the action of the heat treatment on the bioactive compounds from elderberry extract, fluorescence studies were also carried out. In general, heating at temperatures ranging from 100 to 150 ℃ for up to 90 min caused a decrease in fluorescence intensity, simultaneously with significant redshifts in λmax suggesting important molecular changes inside the anthocyanins structure, affecting the antioxidant activity. Increasing the heating time up to 120 min, the elderberry extract peaked at about 88 nm shifted toward higher wavelengths with respect to that of untreated solutions (peak at 442 nm). The kinetics studies of anthocyanins, fluorescence intensity, and antioxidant activity evidenced a decrease of the degradation rate constants with increased temperature while the activation energies for heat-induced fluorescence intensity, monomeric anthocyanins, and antioxidant activity were 39.62 ± 9.60, 49.97 ± 5.61, and 31.04 ± 19.92 kJ/mol, respectively. Our results can be valuable in terms of establishing the appropriate processing and formulation protocols that could lead to a more efficient utilization of these pigments in actual food products and/or nutraceuticals.

Synthesis and Characterization of New Oxazepine Compounds and Estimation its Biological Activity

2020 ◽  
Vol 23 (3) ◽  
pp. 17-23
Author(s):  
Abbas Khudhair Abbas ◽  
◽  
Nasreen R. Jber ◽  
Keyword(s):  
Biological Activity ◽  
Synthesis And Characterization
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