Characterization and molecular dynamic studies of chitosan–iron complexes

Fahmy, T.; Sarhan, Amr

doi:10.1007/s12034-021-02434-1

Cited by 17 publications

(6 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The increased tail width can be explained by the fact that an increase in CuCl 2 content may lead to defects and imperfections in the semicrystalline structure of PVA/CuCl 2 composite samples, a condition that may increase localized states within the forbidden energy bandgap. This behavior is in good agreement with previously published works of polymer composite or polymer blend systems [9,31,32]. The steepness parameter (), which is a measure of the optical absorption edge broadening caused by the interaction of exciton-phonon or electron-phonon can be estimated using E U values as follow (3) where k B is the Boltzmann constant and T is the temperature, respectively.…”

Section: 2supporting

confidence: 90%

Linear and Non-linear optical parameters of Copper Chloride doped Poly (Vinyl Alcohol) for Optoelectronic Applications

et al. 2022

Self Cite

View full text Add to dashboard Cite

Poly (Vinyl Alcohol)/Copper Chloride (PVA/CuCl and 20 wt% of CuCl 2 . UV-Vis spectrum of these composites is investigated in the range of 200 spectrum of PVA showed an absorption band at 278.18 nm and a small shoulder at 313.09 nm and are assigned to  * transition, respectively. On the other hand, the spectra of the PVA/CuCl resonance (SPR) band in the visible band at 778.07 nm. Moreover, it is observed that, the absorption edge of composite samples is red shifted. Also, pure PVA showed an which decreased to 3.48 and 3.92 eV after CuCl also observed that nonlinear optical parameters such as thi refractive index (n 2 ) are influenced by CuCl These results are very encouraging for possible applications constant ( ' ), dielectric loss ( '' ) and photoconductivity have been investigated

show abstract

Section: 2supporting

confidence: 90%

Linear and Non-linear optical parameters of Copper Chloride doped Poly (Vinyl Alcohol) for Optoelectronic Applications

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…Likewise, in CTH formulations, within the range of 800–1200 cm −1 , there are absorption bands corresponding to -O- and P-O-C bonds characteristic of chitosan and GP structures, respectively [ 34 ]. These data appear to reveal that the bonds present in CTH/IDP formulations exhibit absorption bands characteristic of CTHs without IDPs, and there is no evidence of the formation of new bonds or the disappearance of previously existing bonds and specific signals of iron–chitosan interactions, as described by Fahmy and Sarhan et al [ 36 ]. In CT/IDP formulations, there was no observed reduction in the intensity of the absorption band in the 3700–3200 cm −1 region or the absorption band near 1650 cm −1 , indicating that the bonds of chitosan amino groups show no differences with the addition of iron, and there was no evident appearance of/variation in the characteristic absorption bands of Fe-N or Fe-O interactions [ 36 ].…”

Section: Resultsmentioning

confidence: 61%

Thermosensitive Chitosan Hydrogels: A Potential Strategy for Prolonged Iron Dextran Parenteral Supplementation

Durán,

Neira-Carrillo,

Oyarzun-Ampuero

et al. 2023

Polymers

View full text Add to dashboard Cite

Iron deficiency anemia (IDA) presents a global health challenge, impacting crucial development stages in humans and other mammals. Pigs, having physiological and metabolic similarities with humans, are a valuable model for studying and preventing anemia. Commonly, a commercial iron dextran formulation (CIDF) with iron dextran particles (IDPs) is intramuscularly administered for IDA prevention in pigs, yet its rapid metabolism limits preventive efficacy. This study aimed to develop and evaluate chitosan thermosensitive hydrogels (CTHs) as a novel parenteral iron supplementation strategy, promoting IDPs’ prolonged release and mitigating their rapid metabolism. These CTHs, loaded with IDPs (0.1, 0.2, and 0.4 g of theoretical iron/g of chitosan), were characterized for IM iron supplementation. Exhibiting thermosensitivity, these formulations facilitated IM injection at ~4 °C, and its significant increasing viscosity at 25–37 °C physically entrapped the IDPs within the chitosan’s hydrophobic gel without chemical bonding. In vitro studies showed CIDF released all the iron in 6 h, while CTH0.4 had a 40% release in 72 h, mainly through Fickian diffusion. The controlled release of CTHs was attributed to the physical entrapment of IDPs within the CTHs’ gel, which acts as a diffusion barrier. CTHs would be an effective hydrogel prototype for prolonged-release parenteral iron supplementation.

show abstract

“…In the XRD spectrum of CS (Figure 2b), signals appear at 2θ = 11 and 20°, corresponding to 020 and 110 lattice planes, respectively, which indicates the presence of inter-and intramolecular hydrogen bonding between −NH 2 and −OH. 44,45 The peak at 2θ = 20°decreases significantly after the formation of the CS−Fe complex (Figure 2b), which is due to the coordination of Fe(III) with −NH 2 , weakening the CS inter-and intramolecular and intramolecular hydrogenbonding interactions. 46 At the same time, a new crystalline peak appears at 2θ = 35°, 47 S1a).…”

Section: ■ Methodsmentioning

confidence: 99%

Chitosan–Fe(III) Complexes via Green Preparation toward Flame Retardant and High-Mechanical-Strength Epoxy Composites

Zhou

Wang

et al. 2022

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

Biobased flame retardants with facile preparation, high performance in smoke suppression, and mechanical reinforcement toward epoxy resins are worth exploring for feasible sustainability. Although some chitosan-containing flame retardants have been successfully developed so far, the synthesis processes for most of them require the use of large volumes of organic solvents and give low synthetic yields. Herein, we report a facile, green, and high-yielding strategy for the synthesis of chitosan−metal complex flame retardants (CS−Fe) by coordination of chitosan with Fe(III) in water. The results show that incorporating 9 wt % CS−Fe enables the EP composites to pass the UL-94 V-1 rating with a limiting oxygen index (LOI) of 29.5%. At the same time, the peak heat release rate, peak smoke production, total smoke production, peak CO production, and fire growth rate of EP/9CS−Fe are significantly reduced, indicating good flame retardancy. Remarkably, the prepared CS−Fe enhanced both the strength and toughness of EP due to the homogeneous dispersion of CS−Fe and the presence of a reaction between CS−Fe and the EP matrix. This work provides a simple and economic strategy for the green preparation of chitosan-based flame retardants with high efficiency.

show abstract

Characterization and molecular dynamic studies of chitosan–iron complexes

Cited by 17 publications

References 57 publications

Linear and Non-linear optical parameters of Copper Chloride doped Poly (Vinyl Alcohol) for Optoelectronic Applications

Linear and Non-linear optical parameters of Copper Chloride doped Poly (Vinyl Alcohol) for Optoelectronic Applications

Thermosensitive Chitosan Hydrogels: A Potential Strategy for Prolonged Iron Dextran Parenteral Supplementation

Chitosan–Fe(III) Complexes via Green Preparation toward Flame Retardant and High-Mechanical-Strength Epoxy Composites

Contact Info

Product

Resources

About