scholarly journals MODIFICATION OF INULINE BY IODIC ACID

2020 ◽  
pp. 57-60
Keyword(s):  
Ir Spectra ◽  
Iodine Number ◽  
Oxidation State ◽  
Iodic Acid ◽  
Molecular Weights ◽  
Aldehyde Groups ◽  
Reactive Aldehyde

In order to further modify inulin with drugs, the process of introducing reactive aldehyde groups into the inulin macromolecule was carried out. Aldehyde groups were introduced by oxidizing inulin with iodic acid. The process of oxidation of inulin and cellulose with iodic acid was compared. The quantities of aldehyde groups in the oxidized samples were estimated, their molecular weights were determined, IR spectra were measured, the iodine number of the inulin dialdehyde and their oxidation state were determined.

Polyacrolein microspheres as a new tool in cell biology

1982 ◽  
Vol 56 (1) ◽  
pp. 157-175
Author(s):  
S. Margel ◽  
U. Beitler ◽  
M. Ofarim
Keyword(s):  
Cell Biology ◽  
Polymerization Process ◽  
Amino Groups ◽  
Ph Values ◽  
Human Red Blood Cells ◽  
Primary Amino ◽  
Aldehyde Groups ◽  
Potential Use ◽  
Specific Labelling ◽  
Reactive Aldehyde

Polyacrolein (PA) microspheres in sizes ranging from 0.04 micron to 40 microns were synthesized. Magnetic and fluorescent PA microspheres were formed by carrying out the polymerization process in the presence of appropriate ferrofluidic or fluorochromic compounds, respectively. The microspheres carry reactive aldehyde groups, through which various ligands, containing primary amino groups, were covalently bound at physiological pH values. The potential use of these microspheres was demonstrated by the specific labelling of fresh human red blood cells (RBC) and by the separation of human RBC from turkey RBC by means of a magnetic field. PA microspheres were also bound covalently to the anti-allergic drug disodium chromoglycate (DSCG) and the conjugate was used for the labelling of rat basophilic leukaemia cells.

Platin in seiner ungewöhnlichen Oxidationsstufe + III: Diplatin(III)-Komplexe der Modellnukleobase 1-Methyluracil / Platinum in its Unusual Oxidation State + III: Diplatinum(III) Complexes with the Model Nucleobase 1-Methyluracil

1983 ◽  
Vol 38 (11) ◽  
pp. 1441-1445 ◽  
Author(s):  
Bernhard Lippert ◽  
Helmut Schöllhorn ◽  
Ulf Thewalt
Keyword(s):  
Crystal Structure ◽  
Nitric Acid ◽  
Ir Spectra ◽  
Oxidation State ◽  
Structural Similarity ◽  
Single Bond ◽  
Triclinic Space Group ◽  
H Nmr ◽  
Axial Ligands ◽  
Cell Dimensions

Oxidation of the head-tail dimer cis-[(NH3)2Pt(1-MeU)]2(NO3)2 (1-MeU = 1-methyl - uracilato anion, C5H5N2O2) with a mixture of nitrous and nitric acid yields three crystalline species, [(NO2)(NH3)2Pt(C5H5N2O2)2Pt(]SrH3)2(NO2)](NO3)2 · 3 H2O (1), [(H2O)(NH3)2Pt(C5H5N2O2)2Pt(]SrH3)2(NO2)](NO3)2 · 5 H2O (2) and [(NO3)(NH3)2Pt(C5H5N2O2)2Pt(]SrH3)2(NO3)](NO3)2 · 4.5 H2O (3). The crystal structure of 2 has been determined. 2 crystallizes in the triclinic space group P1̄ with cell dimensions a= 11.959(4), b= 11.560(3), c= 11.261(2) Å, α = 89.16(2), β= 104.36(2), γ = 99.61(2)° and Z = 2. The structure was refined to R = 0.056, Rw = 0.061 on 4311 reflections. The Pt-Pt distance within the dinuclear cation of 2 is 2.574(1) Å and cor­responds to a Pt-Pt single bond. The axial ligands are N̲O2 (Ptl) and O̲H2 (Pt2), the equatorial ligands two NH3 groups, N 3 and O4 of 1-MeU for both Pt atoms. The oxidation state of Pt in 2 is +III. 1H NMR and IR spectra of 1, 2, and 3 reveal a close structural similarity of the three compounds.

Aluminium(III) Derivatives of Monofunctional Bidentate Schiff Bases

1973 ◽  
Vol 28 (3-4) ◽  
pp. 153-157 ◽  
Author(s):  
R. N. Prasad ◽  
J. P. Tandon
Keyword(s):  
Schiff Base ◽  
Ir Spectra ◽  
General Formula ◽  
Schiff Bases ◽  
Molecular Association ◽  
Molecular Weights ◽  
Schiff Base Derivatives ◽  
Stoichiometric Ratios ◽  
Derivatives Of

Reactions of aluminium iso-propoxide with monofunctional bidentate Schiff bases having the general formula 2-HOC10H6CH:NR (where R = C2H5, n C3H7, iso-C3H7, n-C4H9, iso-C4H9, sec-C4H9, tert-C4H9 and C6H5) in different stoichiometric ratios have yielded Al(OPri)2(SB), Al(OPri)(SB)2 and Al(SB)3 type of products (where SB is the anion of the corresponding Schiff base, SBH). The ebullioscopic determination of molecular weights shows that the di-iso-propoxy mono- Schiff base derivatives are dimeric; the tris- Schiff base derivatives are monomeric and for the mono-iso-propoxy bis- Schiff base derivatives, molecular association is ~1.4. The IR spectra of a few representative derivatives have been recorded and possible structures indicated.

Effect of Fe oxidation state on the IR spectra of Garfield nontronite

2002 ◽  
Vol 87 (5-6) ◽  
pp. 630-641 ◽  
Author(s):  
Claire-Isabelle Fialips ◽  
Dongfang Huo ◽  
Laibin Yan ◽  
Jun Wu ◽  
Joseph W. Stucki
Keyword(s):  
Ir Spectra ◽  
Oxidation State ◽  
Fe Oxidation

scholarly journals Synthesis and Characterization of Oxidized Polysaccharides for In Situ Forming Hydrogels

Biomolecules ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1185
Author(s):  
Muhammad Muhammad ◽  
Christian Willems ◽  
Julio Rodríguez-Fernández ◽  
Gloria Gallego-Ferrer ◽  
Thomas Groth
Keyword(s):  
Tissue Engineering ◽  
Building Blocks ◽  
Molecular Weights ◽  
In Situ Forming ◽  
In Situ Forming Hydrogels ◽  
Imine Bond ◽  
Aldehyde Groups ◽  
Soft Gels ◽  
In Situ Gelling

Polysaccharides are widely used as building blocks of scaffolds and hydrogels in tissue engineering, which may require their chemical modification to permit crosslinking. The goal of this study was to generate a library of oxidized alginate (oALG) and oxidized hyaluronic acid (oHA) that can be used for in situ gelling hydrogels by covalent reaction between aldehyde groups of the oxidized polysaccharides (oPS) and amino groups of carboxymethyl chitosan (CMC) through imine bond formation. Here, we studied the effect of sodium periodate concentration and reaction time on aldehyde content, molecular weight of derivatives and cytotoxicity of oPS towards 3T3-L1 fibroblasts. It was found that the molecular weights of all oPs decreased with oxidation and that the degree of oxidation was generally higher in oHA than in oALG. Studies showed that only oPs with an oxidation degree above 25% were cytotoxic. Initial studies were also done on the crosslinking of oPs with CMC showing with rheometry that rather soft gels were formed from higher oxidized oPs possessing a moderate cytotoxicity. The results of this study indicate the potential of oALG and oHA for use as in situ gelling hydrogels or inks in bioprinting for application in tissue engineering and controlled release.

One‐Pot Catalytic Synthesis of Aniline‐Copolymer‐Containing Reactive Aldehyde Groups Using a Laccase‐Mediator System

2019 ◽  
Vol 4 (35) ◽  
pp. 10517-10519
Author(s):  
Maria Khlupova ◽  
Olga Morozova ◽  
Galina Shumakovich ◽  
Irina Vasil'eva ◽  
Elena Zaitseva ◽  
...  
Keyword(s):  
Catalytic Synthesis ◽  
One Pot ◽  
Mediator System ◽  
Laccase Mediator System ◽  
Aldehyde Groups ◽  
Reactive Aldehyde

scholarly journals Environmentally friendly cellulose-based polyelectrolytes in wastewater treatment

2017 ◽  
Vol 76 (6) ◽  
pp. 1490-1499 ◽  
Author(s):  
Kinga Grenda ◽  
Julien Arnold ◽  
José A. F. Gamelas ◽  
Maria G. Rasteiro
Keyword(s):  
Periodate Oxidation ◽  
Analytical Techniques ◽  
Paper Mill ◽  
Potential Solution ◽  
Colour Removal ◽  
Cellulose Fibres ◽  
Substitution Degree ◽  
Aldehyde Groups ◽  
Positively Charged ◽  
Reactive Aldehyde

Natural-based polyelectrolytes (PELs), with all the advantages coming from being produced from renewable and biodegradable sources, are a potential solution for the removal of dyes from wastewater. In this work, surplus Eucalyptus bleached cellulose fibres from a paper mill were modified to increase the charge and solubility of cellulose. First, reactive aldehyde groups were introduced in the cellulose backbone by periodate oxidation of cellulose. Further modification with alkylammonium produced positively charged cellulose-based PELs. The final products were characterized by several analytical techniques. The PEL with the highest substitution degree of cationic groups was evaluated for its performance in decolouration processes, bentonite being used as aid. This was found to be effective for colour removal of either anionic or cationic dyes. Bio-PELs can thus be considered as very favourable eco-friendly flocculation agents for decolouration of harsh effluents from several industries, considering their biodegradable nature and thus the ability to produce less sludge.

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