Chemical modification of Chitosan for metal ion removal

Sobahi, Tariq R.; Abdelaal, Magdy Y.; Makki, Mohamad S. I.

doi:10.1016/j.arabjc.2010.12.011

Cited by 65 publications

(21 citation statements)

References 14 publications

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“…Although not fully understood, the relationship between the accumulation of metals in connective tissue and their interference with the formation or resorption of extracellular matrix components has already been proven (18,19). The ability of EDTA, CH, and AA to remove calcium, potassium, magnesium, sodium, sulfur, and zinc phosphate from root dentin may be governed by their metal-related mechanisms of action, i.e., through adsorption, ion exchange, and chelation (7,10,26,27). These interactions vary according to the binding ion, the chemical structure of CH, and the pH of the solution (7,8,27).…”

Section: Discussionmentioning

confidence: 99%

“…One of them, known as the bridge model, is based on the theory that two or more amino groups of a CH chain bind to the same metal ion (7,8,27). The other model is based on the theory that only one amino group of CH participates in the binding, and the metal ion is anchored to the amino group (7,8,27). The adsorption capacity of CH is influenced by the amount of free amino groups and by the hydrophilicity of the adsorbed molecules (27).…”

Section: Discussionmentioning

confidence: 99%

“…The other model is based on the theory that only one amino group of CH participates in the binding, and the metal ion is anchored to the amino group (7,8,27). The adsorption capacity of CH is influenced by the amount of free amino groups and by the hydrophilicity of the adsorbed molecules (27).…”

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Cytotoxicity of Chelating Agents Used In Endodontics and Their Influence on MMPs of Cell Membranes

Pivatto¹,

Pedro²,

Guedes³

et al. 2020

Braz. Dent. J.

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This study evaluated the cytotoxic effect and the ability to inhibit matrix metalloproteinases (MMP-2 and MMP-9) of 0.2% chitosan (CH) and 1% acetic acid (AA) compared with 17% ethylenediaminetetraacetic acid (EDTA). Cell viability assay was performed according to ISO 10993-5 with mouse fibroblasts (L929). The culture was exposed to 0.2% CH, 1% AA, and 17% EDTA. The chelating agents were evaluated immediately after contact with the cells and after 6 h, 12 h, and 24 h of incubation. Cell viability was analyzed using the 3-(4,5-dimethythiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. Inhibition of the gelatinolytic activity of MMP-2 and MMP-9 was evaluated by gelatin zymography. Different concentrations of CH were evaluated: 50 mM, 5 mM, 0.5 mM, and 0.05 mM. EDTA (0.5 mM) was used as a positive control. The results demonstrated that CH and AA had an initial cytotoxic effect, which decreased after 6 h, 12 h, and 24 h, being statistically similar to EDTA (P > 0.05). Additionally, CH at concentrations of 50 mM, 5 mM, and 0.5 mM had an inhibitory effect on MMP-2 and MMP-9, similar to that of the control with EDTA. The chelating agents had no cytotoxic effects after 24 h. MMP-2 and MMP-9 were inhibited by the experimental solutions.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Cytotoxicity of Chelating Agents Used In Endodontics and Their Influence on MMPs of Cell Membranes

Pivatto¹,

Pedro²,

Guedes³

et al. 2020

Braz. Dent. J.

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“…Chitosan has been modified with 5-fluorouracil to serve in the in-vitro antitumor drug delivery system 1,2 . Chitosan has been modified also with different simple organic and polymeric materials as well as multi-walled carbon nanotubes (CNTs) to be used, for instance, in the ion-exchange applications 6,8,9 . Also, both urea-and melamine-formaldehyde waste resins have been used as reinforcing materials within unsaturated polyester matrix 7 .…”

Section: Asian Journal Of Chemistry; Vol 26 No 21 (2014) 7239-7244mentioning

confidence: 99%

“…Among the most attention-attracting applications of the polymers is the application of the modified polymers in the wastewater treatment as well as for the isolation and separation of heavy metal ions from their aqueous solutions. Such polymers with certain functional groups are very important in the environmental applications [8][9][10] .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Chitosan/Urea-Formaldehyde Hollow Resin for Metal Ion Removal

Abdelaal¹,

Bahaffi²,

El-Sayed³

2014

Asian J. Chem.

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In the current study, a series of hollow resins has been synthesized by using chitosan succinate and urea-formaldehyde resin as a cage resin to prepare new polychelates for different metal ions. Resins were characterized by FT-IR spectroscopy, thermal analysis and scanning electron microscopy. Resins have also been investigated for the removal of metal ions from their aqueous solutions through the formation of polychelates of the metal ions and their sorption capacity of such metal ions was determined. The hollow resin exhibited higher surface area than its separate components which facilitates higher ion uptake of metal ions from aqueous solutions.

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