Dihydrazone of dialdehyde starch and its metal complexes

Para, Andrzej; Karolczyk-Kostuch, Stanisława; Fiedorowicz, Maciej

doi:10.1016/j.carbpol.2004.02.001

Cited by 45 publications

(27 citation statements)

References 14 publications

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“…When the hydroxyl groups in the glucose ring have been oxidized to aldehyde groups, the hydrogen bonds between the individual chains become weaker and result in a thermoplastic behavior and hydrophobia. Although dialdehyde starch (DAS) is the most valuable oxidized starch that has already been used in several industrial applications, [25][26][27][28][29] we know of only a few literature reports of TPS prepared from dialdhyde starch and its properties. When the hydroxyl groups are oxidized to aldehydes, the number of hydrogen bonds of starch should be reduced.…”

Section: Introductionmentioning

confidence: 99%

An Investigation of the Effect of Semi-Acetal Formation on the Properties of Dialdehyde Starch and its Thermoplastic Blend with Glycerol

Zhang

Liu

Peang

et al. 2015

Journal of Macromolecular Science, Part B

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Dialdehyde sweet potato starch (DASS) with various aldehyde contents was prepared and the properties analyzed in terms of solubility, intrinsic viscosity, scanning electron microscopy (SEM), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). The results demonstrated that when the aldehyede content of DASS was increased from 20% to 95%, the solubility, molecular weight, crystallizability, and thermal stability decreased. Thermoplastic DASS (TPDASS) was prepared by adding glycerol as a plasticizer; the thermal, rheological, hydrophobic, and tensile properties of TPDASS were investigated. The results indicated that, for the same glycerol content, with the increase of aldehyde content, the moisture adsorption decreased, while the shear viscosity, glass transition temperature, and tensile properties of TPDASS increased significantly. The effects were attributed to the introduction of aldehyde groups reducing the hydrogen bonds and decreasing the hydrophility of the starch. Moreover, the aldehyde and hydroxyl groups of DASS favored a semi-acetal formation with higher aldehyde content and cross-linking of DASS occurred with the increase of aldehyde content. In summary, compared to starch, the thermoplastic properties and hydrophobicity of DASS was improved. In the presence of water (10 wt%), the tensile strength of TPDASS with 95% aldehyde content (TPDASS95) moderately decreased, from 16.7 MPa to 14.0 MPa, when the glycerol content increased from 10% to 30%. The TPDASS with improved properties will find their applications in preparing biodegradable plastics.

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Section: Introductionmentioning

confidence: 99%

An Investigation of the Effect of Semi-Acetal Formation on the Properties of Dialdehyde Starch and its Thermoplastic Blend with Glycerol

Zhang

Liu

Peang

et al. 2015

Journal of Macromolecular Science, Part B

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“…DMSO (assay 99.7%) and absolute ethanol (assay ≥99.8%) were obtained from Sigma-Aldrich. The following reagents were obtained from Sigma-Aldrich: Cu(CH 3 COO) 2 …”

Section: Methodsmentioning

confidence: 99%

“…Recent years witnessed an intensive investigation of the coordination chemistry of hydrazone due to their interesting coordination properties and diverse applications. The chemistry of di-hydrazone ligands have received considerable interest due to their versatility as polyfunctional chelating agents towards different metal ions forming homo-or heterobimetallic complexes [1][2][3]. Dihydrazone ligands are characterized by the presence of two hydrazonic groups (two interlinked nitrogen atoms) which has made it a good polydentate chelating agents that can form different modes of complexes with transition metals leading to biological [4[d1]], analytical, and catalytic applications.…”

Section: Introductionmentioning

confidence: 99%

Coordination behaviour of N′1,N′4-bis((1,5-dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)methylene) succinohydrazide toward transition metal ions and their antimicrobial activities

Saied

Shakdofa

Tabl

et al. 2014

Main Group Chemistry

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Complexes of Cu(II), Ni(II), Co(II), Mn(II), Zn(II) and Fe(III) with N 1 ,N 4 -bis((1,5-dimethyl-3-oxo-2-phenyl-2,3dihydro-1H-pyrazol-4-yl)methylene) succinohydrazide are reported and characterized using various analytical and spectroscopic techniques like 1 H NMR-, mass-, IR-, ESR-, UV-Vis. spectra, magnetic moment and molar conductivity measurements as well as elemental and thermal analyses. The ligand behaves as a dibasic hexadentate N 2 O 4 bonded covalency via the enolic carbonyl oxygen of hydrazide moiety and coordeinated via carbonyl oxygen of antipyrine moiety and azomethine nitrogen atoms. Based on magnetic and electronic spectra data a distorted octahedral geometry around the metal ions has been proposed. The ESR spectrum of copper(II) complexes (3) showed axial symmetry with g >g⊥>g e , indicating a distorted octahedral structure and presence of the unpaired electron in d (x2-y2) orbital. The antimicrobial activities results of the metal complexes 2, 3, 4, 5, 8, 11, 13 and 16 show that, all these complexes exhibit moderate to mild inhibitory effects aganist Bacillus subtilis, Escherichia Coli and Aspergillus niger while the parent ligand is inactive. This enhancement may be attrubied to their structures which possess an additional C=N bond. Moreover, coordination reduces the polarity of the metal ion mainly because of the partial sharing of its positive charge with the donor atom within the chelate ring system, which formed during the coordination. This process, in turn, increases the lipophilic nature of the central metal atom, which favors its permeation more efficiently through the lipid layer of the microorganism thus destroying them more aggressively.

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“…The metal complexes (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22) were prepared by refluxing with strring a suitable amount (2 mmol) of a hot ethanolic solution of the following metal salts:…”

Section: Preparation Of Metal Complexes (3)-(22)mentioning

confidence: 99%

Novel Metal Complexes as Antimicrobial Agents, Synthesis and Spectroscopic Characterization

El‐Tabl¹,

Shaban²,

El-Wahed³

2019

JCCS

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New Mn(II), Co(II), Ni(II), Cu(II), Zn(II) and Mg(II) complexes of ether diamide Schiff-bases have been Synthesized. The ligand and its metal complexes have been characterized using 1 H-NMR, Mass spectra, IR, UV-VIS and ESR spectra, Magnetic moments, Conductance measurements, as well as Elemental and Thermal analyses (DTA and TGA). Molar conductance in DMF solution indicates that, the complexes are non-electrolytes in nature. The electronic spectral data and elemental analyses show that, all complexes have distorted octahedral structure around the metal ions. The ESR spectra of solid Cu(II) complexes show axial type symmetry a d(x 2-y 2) ground state with considerable covalent bond character. However, the other complexes show isotropic type. The antimicrobial activity of the ligands and their complexes was studied. The results show that, the complexes were found to be more active than the ligands against the organisms used.

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Dihydrazone of dialdehyde starch and its metal complexes

Cited by 45 publications

References 14 publications

An Investigation of the Effect of Semi-Acetal Formation on the Properties of Dialdehyde Starch and its Thermoplastic Blend with Glycerol

An Investigation of the Effect of Semi-Acetal Formation on the Properties of Dialdehyde Starch and its Thermoplastic Blend with Glycerol

Coordination behaviour of N′1,N′4-bis((1,5-dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)methylene) succinohydrazide toward transition metal ions and their antimicrobial activities

Novel Metal Complexes as Antimicrobial Agents, Synthesis and Spectroscopic Characterization

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