Chelation of chitosan derivatives with zinc ions. II. Association complexes of Zn2+ ontoO,N-carboxymethyl chitosan

Tang, Lie‐Gui; Hon, David N.‐S.

doi:10.1002/1097-4628(20010222)79:8<1476::aid-app150>3.0.co;2-a

Cited by 64 publications

(20 citation statements)

References 29 publications

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“…Because of the substitution of Zn ions, weak absorption with the considerable shift at 1640 cm −1 frequency and reduction in the intensity of guluronic and the mannuronic acid groups absorption frequency (1100 and 1032 cm −1 ) is noticed in the ZCP, ZAP, and ZSP samples. In comparison with the seaweed IR spectrum, the composite's spectra displayed a new peak at 423 cm −1 which corresponds to ZnO stretching vibration absorption band . Further research is needed to improve the chemical interaction between the seaweed and ZnO.…”

Section: Resultssupporting

confidence: 87%

“…In comparison with the seaweed IR spectrum, the composite's spectra displayed a new peak at 423 cm 21 which corresponds to ZnAO stretching vibration absorption band. 19 Further research is needed to improve the chemical interaction between the seaweed and ZnO. Figure 2 shows the XRD patterns of the PTS, seaweed-ZnO composite, and pure ZnO.…”

Section: Antibacterial Assay By Colony Count Methodsmentioning

confidence: 99%

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Seaweed‐ZnO composite for better antibacterial properties

Pandimurugan

Thambidurai

2014

J of Applied Polymer Sci

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Brown seaweed Padina tetrastromatica (PTS)‐Zinc oxide (ZnO) composites were prepared by chemical precipitation method. The characteristic peaks of PTS and ZnO were confirmed by Fourier transform infrared spectroscopy. X‐ray diffraction study was confirmed the formation of ZnO with hexagonal wurtzite phase. Surface morphology and particle's distribution of ZnO were characterized by scanning electron microscopy. Transmission Electron microscopy image reveals that ZnO nanorods are in the size range of 14–164 nm having uniformly blended with polysaccharide of seaweed. Ultraviolet‐Visible absorption spectra indicated the sharp absorption peak at 219 nm and broad absorption peak in the 250–350 nm range. Fluorescence spectra shows the broad blue‐violet emissions is around at 380–480 nm. Because of the interaction between polysaccharide and ZnO nanorods/particles, the prepared seaweed‐ZnO composite exhibit better antibacterial activity than pure ZnO nanoparticles. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40948.

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Section: Resultssupporting

confidence: 87%

Section: Antibacterial Assay By Colony Count Methodsmentioning

confidence: 99%

Seaweed‐ZnO composite for better antibacterial properties

Pandimurugan

Thambidurai

2014

J of Applied Polymer Sci

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“…The broad band at 3420 cm −1 corresponded to the amine and hydroxyl groups. There was little change in the shape and wavenumber in CM‐chitosan and nanoparticles, which suggested that neither the ‐OH nor the ‐NH 2 group are involved in the coordination of calcium ions and CM‐chitosan 22…”

Section: Resultsmentioning

confidence: 99%

Is radiologic placement of an arm port mandatory in oncology patients?

Marcy

Magné

Castadot

et al. 2007

Cancer

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The aim of this study was to evaluate the potential of carboxymethyl chitosan (CM‐chitosan) nanoparticles as carriers for the anticancer drug, doxorubicin (DOX). Different kinds of CM‐chitosan with various molecular weight (MW) and degree of substitution (DS) were employed to prepare nanoparticles through ionical gelification with calcium ions. Factors affecting nanoparticles formation in relation to MW and DS of CM‐chitosan were discussed. By the way of dynamic light scattering (DLS), TEM, and atomic force microscopy (AFM), nanoparticles were shown to be around 200–300 nm and in a narrow distribution. FTIR revealed strong electrostatic interactions between carboxyl groups of CM‐chitosan and calcium ions. DOX delivery was affected by the molecular structure of CM‐chitosan. Increasing MWs of CM‐chitosan from 4.50 to 38.9 kDa, DOX entrapment efficiency was enhanced from 10 to 40% and higher DS slightly improved the load of DOX. In vitro release studies showed an initial burst followed by an extended slow release. The DOX release rate was hindered by CM‐chitosan with high MW and DS. These preliminary studies showed the feasibility of CM‐chitosan nanoparticles to entrap DOX and the potential to deliver it as controlled release nanoparticles. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 4689–4696, 2006

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“…The first broad and poorly resolved band around 3400-3450 cm −1 corresponds to the contribution of O-H stretching (from intraand intermolecular hydrogen bonds) and N-H stretching (Wang et al 2000;Tang & Hon 2001). A lot of differences in the spectra before and after metal binding were also observed in the environ- Figures 1B-E, which suggests the amine or the acetamide group at C2 involved in metal binding (Tang & Hon 2001;Mekahlia & Bouzid 2009). Moreover, the intensity of the band at 1414 cm −1 in chitosan molecule was substantially affected after metal binding especially in the case of the chitosan-Ag complex ( Figure 1B).…”

Section: Characterisation Of Chitosans and Chitosanmetal Complexesmentioning

confidence: 99%

Insecticidal activity of chitosans of different molecular weights and chitosan-metal complexes against cotton leafworm Spodoptera littoralis and oleander aphid Aphis nerii

Badawy¹,

El-Aswad²

2012

Plant Prot. Sci.

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Badawy M.E.I., El-Aswad A.F. (2012): Insecticidal activity of chitosans of different molecular weights and chitosan-metal complexes against cotton leafworm Spodoptera littoralis and oleander aphid Aphis nerii. Plant Protect. Sci., 48: 131-141.As an alternative to synthetic pesticides, chitosan has received much attention as a biopolymer active against some agricultural pests. The, insecticidal activity of chitosans of four molecular weights (2.27 × 10 5 , 3.60 × 10 5 , 5.97 × 10 5 , and 9.47 × 10 5 g/mol) was investigated against two species of arthropod pests: oleander aphidAphis nerii and cotton leafworm Spodoptera littoralis. In addition, the most active chitosan of 2.27 × 10 5 g/mol was chemically modified with metals of Ag(I), Cu(II), Ni(II), and Hg(II) to give corresponding chitosan-metal complexes. Larval mortality, growth inhibition, and antifeedant activities for third instar larvae of S. littoralis were evaluated at 4 g (a.i.) chitosan/kg diet. Chitosan of 2.27 × 10 5 g/mol and its complexes with Ni and Hg were the most active compounds. The results against A. nerii indicated that chitosans of 3.60 × 10 5 and 5.97 × 10 5 g/mol showed high activity among the different molecular weights in leaf-dip bioassay after 24 h of treatment with 48 and 49% mortalities, respectively, at 1000 mg/l. All compounds had a systemic effect against A. nerii. Chitosans of 2.27 × 10 5 , 3.60 × 10 5 , and 5.97 × 10 5 g/mol showed the highest efficacy at all concentrations tested; however, chitosan-Cu was significantly the most active among the complexes.

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Chelation of chitosan derivatives with zinc ions. II. Association complexes of Zn2+ ontoO,N-carboxymethyl chitosan

Cited by 64 publications

References 29 publications

Seaweed‐ZnO composite for better antibacterial properties

Seaweed‐ZnO composite for better antibacterial properties

Is radiologic placement of an arm port mandatory in oncology patients?

Insecticidal activity of chitosans of different molecular weights and chitosan-metal complexes against cotton leafworm Spodoptera littoralis and oleander aphid Aphis nerii

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