Heteropolymolybdate–amino acid complexes: synthesis, characterization and biological activity

Li, Juan; Qi, Yanfei; Li, Jing; Wang, Hongfang; Wu, Xinyu; Duan, Liying; Wang, Enbo

doi:10.1080/00958970412331295237

Cited by 33 publications

(11 citation statements)

References 22 publications

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“…In comparison with the starting anions, the bonds arising from the heteropoly anions are changed in position. This demonstrates interaction between the nitrogen atom of the amino acid and the oxygen atom of the heteropoly acid [16]. Furthermore, these obtained results are in good accordance with the previous reports [14][15][16][17][18][19].…”

Section: Characterization Of Pomssupporting

confidence: 94%

“…Dodecatungstophosphoric acid (H 3 PW 12 O 40 , abbreviated as HPW) [14], tyrosine dodecatungstophosphate ((HTyr) 3 [15], and ornithine dodecatungstosilicate ((HOrn) 4 [SiW 12 O 40 ] abbreviated as (HOrn)SiW) [16] were synthesized by previously reported methods and confirmed by FT-IR spectroscopy, elemental analysis, and X-ray fluorescence. All reagents and solvents were purchased from Merck Company and used without further purification.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Stability investigation of some heteropolyoxotungstate and heteropolyoxomolybdate salts in buffer solutions

Dianat

Tangestaninejad

Yadollahi

et al. 2012

Journal of Molecular Liquids

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Section: Characterization Of Pomssupporting

confidence: 94%

Section: Methodsmentioning

confidence: 99%

Stability investigation of some heteropolyoxotungstate and heteropolyoxomolybdate salts in buffer solutions

Dianat

Tangestaninejad

Yadollahi

et al. 2012

Journal of Molecular Liquids

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“…Some interesting approaches to realize that have been described. Currently, heteropolymolybdates with attached amino acids are gaining in importance [4,5]. Stable associates of high lipophilicity have been obtained by the encapsulation of POMs using surfactants (surfactant encapsulated clusters) and dendritic ligands (dendritic encapsulated clusters) [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Chitosan-encapsulated Keggin Anion [Ti2W10PO40]7−. Synthesis, Characterization and Cellular Uptake Studies

Meißner

Bergmann

Oswald

et al. 2006

Transition Met Chem

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The Keggin type polyoxotungstate [Ti 2 W 10 PO 40 ] 7) forms stable associates with the biopolymer chitosan in the nanometer size range. The cluster compound crystallizes from aqueous solution as K 4 H 3 [Ti 2 W 10 PO 40 ] AE 15H 2 O having a tetragonal structure. Both, the cluster compound and the chitosan/[Ti 2 W 10 PO 40 ] associates show a high hydrolytic stability at pH 7.4. The associates formed between the cluster anion [Ti 2 W 10 PO 40 ] 7) with the polyaminosaccharide chitosan have been characterized by photon correlation spectroscopy, scanning electron microscopy, filtration, centrifugation and zeta potential measurements. The size of the associates formed is in the range of ca. 5Â10 1 to 5Â10 2 nm. These particles have a defined stoichiometry with 5-6 cluster anions bound per molecule chitosan. The isoelectric point determined by zeta potential measurements was found for a cluster anion to chitosan molar ratio of 5.5, indicating the charge neutralization between protonated chitosan and [Ti 2 W 10 PO 40 ] 7) anions. Cellular uptake studies with [Ti 2 W 10 PO 40 ] 7) using tumor cell lines FaDu (human squamous carcinoma) and HT-29 (human adenocarcinoma) showed that the tungsten amount inside the cells is remarkably enhanced in the presence of chitosan.

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“…The unit is close to centrosymmetric, but for the chiral residues of both ligand molecules. Furthermore, there are some L-ornithine salts with molybdate clusters (the so-called Keggin-type polyoxometalates, Li et al 2004), in which the clusters dominate the structure, and L-ornithine zwitterions coordinate these clusters. An older work (Brubaker and Busch 1966) identified a salt of the composition bis(L-ornithine) NiCl 2 by spectroscopy, but no crystals of this phase could be grown to date.…”

Section: Other Nonstandard Amino Acidsmentioning

confidence: 99%

Compounds of Amino Acids and Neutral Salts

Fleck

Petrosyan

2014

Salts of Amino Acids

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In this chapter we present salts composed of amino acids combined with inorganic cations and anions. These salts generally contain amino acids in neutral, i.e., zwitterionic form, with the charges balanced by the cations and anions. However, some of the phases resented here contain cations, anions, and amino acids, but the amino acids are not in neutral form, as, e.g., glycinate À Cu, but for reasons of similarity, they are included in this chapter. The variation of salts (and thus the number of species) is even greater as for salts of amino acids and cations, as a multitude of combinations of amino acids, cations, and anions is possible. Additionally, different hydration states are often found, as well as different ratios of components. Thus, there are several instances of systems containing more than one phase (e.g., the system glycine-zinc-chloride-water). Despite the greater variation, many coordination patterns found in the salts described in the previous chapter recur in the salts reported here. Likewise, the connectivities of units are similar as those found in salts of amino acids and cations. Instances of materials with noteworthy physical properties are presented. Keywords Introducing RemarksAs stated before, this chapter deals with salts of amino acids and neutral, inorganic salts. In these species, the amino acid usually exists in zwitterionic form, but it is still coordinated to a cation. As other anions are present, the amino acids are not the only possible ligands. These anions can act as additional ligands (plus possible water molecules as well). Moreover, in some cases the inorganic anions are not part of the coordination spheres, but located in the interstices between units composed of cations and coordinating amino acids.M. Fleck and A.M. Petrosyan, Salts of Amino Acids: Crystallization, Structure and Properties,

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Heteropolymolybdate–amino acid complexes: synthesis, characterization and biological activity

Cited by 33 publications

References 22 publications

Stability investigation of some heteropolyoxotungstate and heteropolyoxomolybdate salts in buffer solutions

Stability investigation of some heteropolyoxotungstate and heteropolyoxomolybdate salts in buffer solutions

Chitosan-encapsulated Keggin Anion [Ti2W10PO40]7−. Synthesis, Characterization and Cellular Uptake Studies

Compounds of Amino Acids and Neutral Salts

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