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Artigos de revistas sobre o tema "Chelates"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 25 de julho de 2025

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1

Hu, Xiao, Sai Rui Ma, Yan Yan Wu, et al. "Antioxidant Activities of Tilapia (Oreochromis niloticus) Protein Hydrolysates-Iron Chelate Based on Properties of Biological Materials." Advanced Materials Research 700 (May 2013): 263–67. http://dx.doi.org/10.4028/www.scientific.net/amr.700.263.

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Tilapia (Oreochromis niloticus) protein was hydrolysed by papain, and then the tilapia (Oreochromis niloticus) protein hydrolysates (TPH) chelated with ferrous ions at various mass ratios of TPH to FeCl2 (5:1, 10:1 and 20:1) to obtain the biological materials of chelate I, chelate II and chelate III, respectively. The ferrous-binding rate and antioxidant activities of the chelates were investigated. It was found that the ferrous-binding rate increased with the increase of mass ratios (TPH/FeCl2) from 5:1 to 20:1. The DPPH radical scavenging activity and reducing power activity of chelate III w

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2

K., Sethy S.Tripathy V.T. Andhale and D. Thakur. "Role of Mineral Chelates in Health and Production of Animals." Trends In Agriculture Science 3, no. 9 (2023): 727–29. https://doi.org/10.5281/zenodo.8325951.

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Traditionally, trace elements are supplemented in the diet of the animals as inorganic salts. However, recently there are many reports indicating that absorption and utilization of trace elements is comparatively far better if they are supplemented in the chelated forms related to their inorganic salts. A large number of studies conducted on chelated forms of trace elements indicate that they not only improve the performance of the animals in respect of growth, milk production, wool production or reproduction but they are effective in reducing the various stresses and also improve the immune r

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3

Nechiporenko, Ivan, Svetlana Akimova, Pavel Kazakov, Elena Nikulina, and Nina Tsirulnikova. "Screening of different Fe(III) and Fe(II) chelate complexes in clonal micropropagation technology of highbush blueberry (Vaccinium corymbosum L.)." BIO Web of Conferences 66 (2023): 02002. http://dx.doi.org/10.1051/bioconf/20236602002.

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The element iron plays a key role in plant physiology. For plant nutrition, chelated forms of iron are preferred. Therefore, in clonal micropropagation media, FeSO4 x 7H2O is usually introduced together with Na2EDTA. At the same time, other effective iron chelates with both carboxyl and phosphorus chelates are known. So far, there are few scientific studies on the effect of iron chelates complexes on blueberry plants under in vitro conditions. Therefore, studies were conducted with different iron chelate complexes in 4 concentrations on highbush blueberry (Vaccinium corymbosum L.) cv. Brigitta

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4

Malenov, Dušan P., Dušan Ž. Veljković, Michael B. Hall, Edward N. Brothers, and Snežana D. Zarić. "Influence of chelate ring type on chelate–chelate and chelate–aryl stacking: the case of nickel bis(dithiolene)." Physical Chemistry Chemical Physics 21, no. 3 (2019): 1198–206. http://dx.doi.org/10.1039/c8cp06312e.

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Okada, Chiaki, Noriyuki Hatae, and Eiko Toyota. "Structural study of the Schiff base copper(II) chelates as thrombin inhibitor." Acta Crystallographica Section A Foundations and Advances 70, a1 (2014): C1665. http://dx.doi.org/10.1107/s205327331408334x.

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Thrombin is a trypsin-like serine protease that plays a critical role in the blood coagulation cascade. Thus, studies on thrombin-specific inhibitor are useful for the design of clinical useful compounds. We have previously reported of the Schiff base metal chelates carrying benzamidine and amino acid moieties. More than 50 kinds of Schiff base copper(II) chelates were synthesized fromp- orm-amidinosalicylaldehyde and various L- or D-amino acids. These chelates have effective inhibitory activity for trypsin and thrombin (Ki= 10-5~ 10-6M). In this series of inhibitors, the copper(II) chelate de

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6

Alshater, Heba, Ahlam I. Al-Sulami, Samar A. Aly, Ehab M. Abdalla, Mohamed A. Sakr, and Safaa S. Hassan. "Antitumor and Antibacterial Activity of Ni(II), Cu(II), Ag(I), and Hg(II) Complexes with Ligand Derived from Thiosemicarbazones: Characterization and Theoretical Studies." Molecules 28, no. 6 (2023): 2590. http://dx.doi.org/10.3390/molecules28062590.

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Four new complexes (Ni2+, Cu2+, Ag+, and Hg2+) were prepared from the ligand N-(4-chlorophenyl)-2-(phenylglycyl)hydrazine-1-carbothioamide (H2L). Analytical and spectroscopic techniques were used to clarify the structural composition of the new chelates. In addition, all chelates were tested against bacterial strains and the HepG2 cell line to determine their antiseptic and carcinogenic properties. The Ni(II) complex was preferable to the other chelates. Molecular optimization revealed that H2L had the highest reactivity, followed by Hg-chelate, Ag-chelate, Ni-chelate, and Cu-chelate. Moreover

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7

Nikiforov-Nikishin, D. L., N. I. Kochetkov, S. V. Smorodinskaya, P. Yu Tatarenko, and D. M. Matveeva. "Toxicity of metal chelates mixture in aquatic environment at Danio rerio." IOP Conference Series: Earth and Environmental Science 839, no. 5 (2021): 052010. http://dx.doi.org/10.1088/1755-1315/839/5/052010.

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Abstract In this paper, the toxic effect of a complex chelate mixture containing microelements (Fe, Mn, Zn, Se, I, Cu) on Danio rerio was investigated. Chelated compounds are used to detoxify elements in the aquatic environment, as well as feed additives for various types of farm animals. The effect of chelate complexes was studied according to the following parameters: LC50, survival in chronic experience (30 days), embryotoxicity and genotoxicity by the micronucleus test method. The established LC50 value was 2.73 mg/l, the maximum allowable concentration that does not have a negative effect

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8

Krishnankutty, K., Basheer Ummathur, and Perumpalli Ummer. "1-naphthylazo derivatives of some 1,3-dicarbonyl compounds and their Cu (II), Ni(II) and Zn(II) complexes." Journal of the Serbian Chemical Society 74, no. 11 (2009): 1273–82. http://dx.doi.org/10.2298/jsc0911273k.

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The coupling of diazotized 1-aminonaphthalene with 1,3-dicarbonyl compounds (acetylacetone, methylacetoacetate and acetoacetanilide) yielded a new series of bidentate ligand systems (HL). Analytical, IR, 1H-NMR and mass spectral data indicate that the compounds exist in the intramolecularly hydrogen bonded keto-hydrazone form. With Ni(II), Cu(II) and Zn(II), these potential monobasic bidentate ligands formed [ML2] type complexes. The IR, 1H- -NMR and mass spectral data of the complexes are consistent with the replacement of the chelated hydrazone proton of the ligand by a metal ion, thus leadi

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9

Subramani, Murali, Jawahar Durairaj, Chitdeshwari Thiyagarajan, and Jagadesh Muthumani. "Synthesis of iron chelates for remediation of iron deficiency in an alkaline and calcareous soil." Journal of Applied and Natural Science 13, SI (2021): 149–55. http://dx.doi.org/10.31018/jans.v13isi.2818.

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The present study was aimed to investigate the using iron chelates viz., ferrous glycinate and ferrous citrate for the remediation of iron deficiency in alkaline and calcareous soil. The lab experiment was carried out to study the synthesis of Fe chelates by using organic and amino acid based chelating agents. The Fe chelates were synthesized based on 2:1 molar ratio of chelating agents and metal ions. The synthesized iron chelate was characterized by using Fourier transform infrared spectrophotometer (FT-IR). Finally, the synthesized amino acid and organic acid chelated iron were used to reme

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10

Wu, Yu Qi, Lian Jin Weng, Yuan Yuan Han, Xin Yang, and Di Geng. "Synthesis and Infrared Spectrum Characterization of Phenylalanine Chelated Calcium Complex." Advanced Materials Research 396-398 (November 2011): 1549–53. http://dx.doi.org/10.4028/www.scientific.net/amr.396-398.1549.

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The preparation conditions in the water system of phenylalanine chelated calcium complex have been evaluated though single-factor tests and optimized by uniform design. Then the optimal parameters were obtained as follows: reaction temperature is 40 °C, reaction time is 182 min, the molar ratio of phenylalanine to calcium is 4.3 and pH = 9.0. Under the best conditions, the experimental result gives chelating rate = 87.40% that is 17.12% lower than the prediction = 104.52%.The infrared spectrum characterization has confirmed the formation of phenylalanine-Ca2+ chelates and the existence of chel

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11

Ttaib, K. El, A. Benhmid, and R. Hasan Omar. "The Interaction of Nickel (II) Ion with Ethylene Diamine (en) Chelate Using Ethaline (Ionic Liquid) as a Solvent." Chemical Science International Journal 33, no. 5 (2024): 88–101. http://dx.doi.org/10.9734/csji/2024/v33i5918.

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For this experiment, this is the first time using 1 choline chloride (ChCl): 2 ethylene glycol (EG)based liquid (ethaline) to study the interaction between Ni (II) with ethylene diamine. Two of the optical methods for analyzing spectrophotometric measurements (continuous variations and molar ratio methods) have been utilized for determination of, the stoichiometry and whenever possible, the stability constants of the chelates formed. Job`s method was necessary to determine whether, the metal ion and the ligand ethylene diamine form one or more than one chelate, when more than one chelate forme

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12

Esmaeel RABABAH, Sanaa, and Makasib Saleh Mohammed ALSOUYIHIL. "CORRELATING EXPERIMENTAL RESULT WITH THEORETICAL CALCULATIONS ON: EFFECTS OF SUBSTITUENTS ON EXTRACTION EFFICIENCY OF NAPHTHALENE BASED CHELATES (MONO- AND DI-SUBSTITUTED) FOR Hg(II), Cd(II), AND Pb(II) DIVALENT IONS." MINAR International Journal of Applied Sciences and Technology 05, no. 01 (2023): 69–86. http://dx.doi.org/10.47832/2717-8234.14.7.

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Three of the most dangerous and toxic metal ions—Hg(II), Cd(II), and Pb—were chelated using the naphthalene derivatives (NPC, NPM, NPS, DNP, DMS, and NPH) in this study (II). By calculating the percent extraction for each individual interaction between the provided chelates and each of the stated ions, the effectiveness in capturing (extracting) for the three metal ions was assessed. DNP has an excellent extractor for the three metal ions (77. 2, 31.58, 42.0% percent extraction for Hg, Cd, and Pb, respectively); NPM has a good extractor for Hg ions in particular; however, NPS has a poor extrac

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13

Höpfl, Herbert, and Norberto Farfán. "Article." Canadian Journal of Chemistry 76, no. 12 (1998): 1853–59. http://dx.doi.org/10.1139/v98-192.

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Boron chelates obtained from salicylaldehyde and 2prime-hydroxyacetophenone azines are colored compounds with potential applications in analytical chemistry. Up to now these complexes have not been studied by X-ray crystallography, although two structures with a six- or a seven-membered chelate ring are possible. This contribution presents the X-ray analysis of 2prime-hydroxyacetophenone azine and its corresponding new mono(diphenylboron) chelate with a six-membered boron heterocyclic ring. With these data structural changes of the ligand on chelate formation and structural differences in comp

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14

Saeedi, Reza, Nematollah Etemadi, Ali Nikbakht, Amir H. Khoshgoftarmanesh, and Mohammad R. Sabzalian. "Calcium Chelated with Amino Acids Improves Quality and Postharvest Life of Lisianthus (Eustoma grandiflorum cv. Cinderella Lime)." HortScience 50, no. 9 (2015): 1394–98. http://dx.doi.org/10.21273/hortsci.50.9.1394.

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Lisianthus is one of the most important specialty cut flowers in the world. Various greenhouse conditions and inadequate evapotranspiration can disturb the transport of calcium and impair its uptake by plants. This study aimed to compare the effects of calcium amino acid chelates and calcium chloride (CaCl2) on flower production, quality, and postharvest life of cut ‘Cinderella Lime’ lisianthus. Therefore, nutrient solutions containing calcium amino acid chelates (1%) were prepared using calcium and equal concentrations of lysine, threonine, or methionine. The control treatment was a solution

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15

Muthukumar, C., A. Sabastiyan, S. Valarselvan, M. Subramanian, and M. Shanmugavadivel. "SYNTHESIS, CHARACTERIZATION AND ANTIMICROBIAL ACTIVITY OF MANGANESE(II) AND NICKEL(II) COMPLEXES OF 7-DIETHYLAMINOBENZYL-8-HYDROXYQUINOLINE." JOURNAL OF ADVANCES IN CHEMISTRY 12, no. 4 (2016): 4324–32. http://dx.doi.org/10.24297/jac.v12i4.2172.

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8-Hydroxyquninoline Mannich base namely 7-diethylaminobenzyl-8-hydroxyqunioline(DEBQ) was synthesized and characterized by elemental analysis and spectral studies. Chelates of DEBQ with manganese(II) and nickel(II) were isolated and structurally characterized by elemental analysis, electrical conductance, magnetic susceptibility measurement, thermal analysis, IR,UV-Vis, EPR and Mass spectral data. The Mannich base ligand is bidentate and chelates through the phenolic oxygen and the aliphatic tertiary amino nitrogen atoms. Based on the magnetic and electronic spectral data all the MnII complexe

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16

Van Dam, ME, GE Wuenschell, and FH Arnold. "Metal affinity precipitation of proteins." Biotechnology and Applied Biochemistry 11, no. 5 (1989): 492–502. http://dx.doi.org/10.1111/j.1470-8744.1989.tb00071.x.

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Proteins containing multiple surface‐accessible histidine residues can be precipitated using small quantities of bis‐copper chelates. The chelates serve to crosslink the proteins, presumably via the accessible histidines, leading to the formation of large, insoluble complexes. When excess copper chelate is used to carry out the precipitation, the resulting precipitate has a stoichiometry of 1:1 copper:accessible histidine. The precipitation is analogous to antibody‐antigen precipitin reactions and can be described qualitatively using simple equilibrium theory developed for those systems. Human

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17

Blomqvist, Lennart, Gunnar F. Nordberg, Valeria M. Nurchi, and Jan O. Aaseth. "Gadolinium in Medical Imaging—Usefulness, Toxic Reactions and Possible Countermeasures—A Review." Biomolecules 12, no. 6 (2022): 742. http://dx.doi.org/10.3390/biom12060742.

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Gadolinium (Gd) is one of the rare-earth elements. The properties of its trivalent cation (Gd3+) make it suitable to serve as the central ion in chelates administered intravenously to patients as a contrast agent in magnetic resonance imaging. Such Gd-chelates have been used for more than thirty years. During the past decades, knowledge has increased about potential harmful effects of Gd-chelates in patients with severe renal dysfunction. In such patients, there is a risk for a potentially disabling and lethal disease, nephrogenic systemic fibrosis. Restricting the use of Gd-chelates in person

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18

DeAlba-Montero, I., Jesús Guajardo-Pacheco, Elpidio Morales-Sánchez, et al. "Antimicrobial Properties of Copper Nanoparticles and Amino Acid Chelated Copper Nanoparticles Produced by Using a Soya Extract." Bioinorganic Chemistry and Applications 2017 (2017): 1–6. http://dx.doi.org/10.1155/2017/1064918.

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This paper reports a comparison of the antibacterial properties of copper-amino acids chelates and copper nanoparticles againstEscherichia coli,Staphylococcus aureus, andEnterococcus faecalis. These copper-amino acids chelates were synthesized by using a soybean aqueous extract and copper nanoparticles were produced using as a starting material the copper-amino acids chelates species. The antibacterial activity of the samples was evaluated by using the standard microdilution method (CLSI M100-S25 January 2015). In the antibacterial activity assays copper ions and copper-EDTA chelates were incl

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19

Hertrampf and Olivares. "Iron Amino Acid Chelates." International Journal for Vitamin and Nutrition Research 74, no. 6 (2004): 435–43. http://dx.doi.org/10.1024/0300-9831.74.6.435.

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Iron amino acid chelates, such as iron glycinate chelates, have been developed to be used as food fortificants and therapeutic agents in the prevention and treatment of iron deficiency anemia. Ferrous bis-glycine chelate (FeBC), ferric tris-glycine chelate, ferric glycinate, and ferrous bis-glycinate hydrochloride are available commercially. FeBC is the most studied and used form. Iron absorption from FeBC is affected by enhancers and inhibitors of iron absorption, but to a lesser extent than ferrous sulfate. Its absorption is regulated by iron stores. FeBC is better absorbed from milk, wheat,

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I. Beshkenadze, L. Japaridze, E. Salukvadze, L. Gogua, and G. Kozmanishvili. "Synthesis and study of arginine-containing manganese and zinc chelates." World Journal of Advanced Research and Reviews 14, no. 1 (2022): 029–35. http://dx.doi.org/10.30574/wjarr.2022.14.1.0249.

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Synthesis conditions have been established and arginine-containing manganese and zinc chelate compounds have been synthesized with general formula: Me (Arg)n(CH3COO)2·mH2O, where Me=Mn, Zn; Arg- neutral molecule of arginine; n=1÷3; m=1÷4. Synthesized chelates have been studied using a number of physical-chemical researches. In particular, composition has been identified via trace element analysis, while the individuality has been established through fusion temperature measurement and diffractometric method. According to qualitative solubility research, chelates are highly soluble in water, but

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21

Martell, Arthur E., Ramunas J. Motekaitis, Dian Chen, Robert D. Hancock, and Derek McManus. "Selection of new Fe(III)/Fe(II) chelating agents as catalysts for the oxidation of hydrogen sulfide to sulfur by air." Canadian Journal of Chemistry 74, no. 10 (1996): 1872–79. http://dx.doi.org/10.1139/v96-210.

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The removal and oxidation to sulfur of H2S, contained in a broad range of sour gas streams including natural gas, by a Fe(III)/Fe(II) chelate system imposes several requirements on the iron chelate that is employed as the redox catalyst. The solution of the catalyst must be neutral or mildly alkaline to efficiently absorb H2S from the gas passed through the solution. The stability of the iron(III) chelate must be high enough that solid Fe(OH)3 not precipitate at the pH employed. Also the stability of the iron(II) chelate must be high enough to prevent the precipitation of FeS from the reaction

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22

Ohorodnichuk, H., V. Zagamula, Y. Zagamula, and Y. Trembitskyi. "Killing indicators and quality of muscle tissue of pigs after administration of the drug “Kronocid-L” into the diet." Scientific Messenger of LNU of Veterinary Medicine and Biotechnologies 26, no. 100 (2024): 70–74. http://dx.doi.org/10.32718/nvlvet-a10010.

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The effect of feeding the drug “Kronocid-L” with the content of chelated compounds of microelements on slaughter performance and the quality of muscle tissue of pigs was investigated. Chelate compounds, or chelates (from the English chelate – claw), belong to complex compounds that are formed as a result of the connection of a cation (metal ion) with two or more atoms of a complexon (ligand) molecule. Chelates are significantly different from non-chelated compounds both in terms of chemical and physical properties and in their effects on living organisms. A scientific and economic experiment w

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Ziegler, Christopher J. "Isoindoline-Based Open Macrocycles." ECS Meeting Abstracts MA2022-01, no. 14 (2022): 949. http://dx.doi.org/10.1149/ma2022-0114949mtgabs.

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Diiminoisoindoline (DII) continues to be a useful reagent for the synthesis of phthalocyanine-inspired macrocycles and chelate systems. When combined with pyrazole, indazole, and benzimidazole-based heterocycles, DII forms a chelate that can undergo a template reaction at metal sites to produce phthalocyanine analog compounds. These analogs are ring open macrocycles, where the ring either closes via a non-covalent interaction (biliazine and subbiliazine) or forms a helical structure, the new heliphyrin chelates. This talk will present recent developments and the electrochemical properties of t

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Klem-Marciniak, Ewelina, Marta Huculak-Mączka, Kinga Marecka, Krystyna Hoffmann, and Józef Hoffmann. "Chemical Stability of the Fertilizer Chelates Fe-EDDHA and Fe-EDDHSA over Time." Molecules 26, no. 7 (2021): 1933. http://dx.doi.org/10.3390/molecules26071933.

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In application conditions, the influence of environmental parameters on used fertilizer chelates and their distribution over time is important. For this purpose, the changes in the content of micronutrient ions and Fe-EDDHA and Fe-EDDHSA chelates in an aqueous medium at different pH values were studied. In the assumed time, changes in the ions content were analyzed using the voltammetry method at pH 3, 5 and 7. The content of isomers and chelate forms was analyzed by ion pair chromatography at pH 3, 5 and 7. These studies allowed us to determine the effect of pH on the stability of iron chelat

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I., Beshkenadze, Japaridze L., Salukvadze E., Gogua L., and Kozmanishvili G. "Synthesis and study of arginine-containing manganese and zinc chelates." World Journal of Advanced Research and Reviews 14, no. 1 (2022): 029–35. https://doi.org/10.5281/zenodo.6999248.

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Synthesis conditions have been established and arginine-containing manganese and zinc chelate compounds have been synthesized with general formula: Me (Arg)n(CH<sub>3</sub>COO)<sub>2</sub>·mH<sub>2</sub>O, where Me=Mn, Zn; Arg- neutral molecule of arginine; n=1÷3; m=1÷4. Synthesized chelates have been studied using a number of physical-chemical researches. In particular, composition has been identified via trace element analysis, while the individuality has been established through fusion temperature measurement and diffractometric method. According to qualitative solubili

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Malenov, Dušan P., and Snežana D. Zarić. "Chelated metal ions modulate the strength and geometry of stacking interactions: energies and potential energy surfaces for chelate–chelate stacking." Physical Chemistry Chemical Physics 20, no. 20 (2018): 14053–60. http://dx.doi.org/10.1039/c7cp06262a.

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CCSD(T)/CBS and DFT calculations show very strong stacking of acac-type chelates, up to −9.70 kcal mol<sup>−1</sup>. Different electrostatic potentials above the metals cause different geometries of the most stable chelate–chelate stacking interactions.

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Kurajica, Stanislav, Gregor Mali, Vilko Mandić, and Iva Minga. "Multinuclear Magnetic Resonance Study on Aluminium Sec-butoxide Chelated with Ethyl Acetoacetate in Various Amounts." Croatica chemica acta 92, no. 1 (2019): 17–28. http://dx.doi.org/10.5562/cca3426.

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Reactive aluminum alkoxide (ASB, aluminium sec-butoxide) was chelated using β-diketone (EAA, ethyl acetoacetate) in order to gain control over rapid hydrolysis in the course of the sol-gel process. Derived chelates were analysed using several NMR spectroscopic techniques: one-dimensional 1H, 13C, 27Al NMR and two-dimensional COSY, HSQC and DOSY. The NMR analysis enabled identification of the formed chelate species, as well as determination of their quantitative relationships. Several complexation products were observed: tris-chelated monomer, Al(EAA)3, bis-chelated dimmer, Al2(OnBu)4(EAA) 2, t

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Kliegel, Wolfgang, Ulf Riebe, Steven J. Rettig, and James Trotter. "Structural studies of organoboron compounds LXIII. Reaction of ketoximes with aldehydes and diphenylborinic acid, and the crystal and molecular structures of two different types of boron chelates and one of the precursor aldehyde adducts." Canadian Journal of Chemistry 73, no. 6 (1995): 835–45. http://dx.doi.org/10.1139/v95-104.

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The diphenylboron chelates of ketoxime adducts to formaldehyde and trichloroacetaldehyde (chloral) have been synthesized. The reactions were carried out as three-component one-pot reactions, and also as two-step reactions for the ketoxime chloral adducts, which were isolated and characterized before reaction with oxybis(diphenylborane) to form the diphenylboron chelates. One of the intermediate adducts and two of the diphenylboron chelates have been characterized by X-ray crystallographic analysis. Crystals of O-(2,2,2-trichloro-1-hydroxyethyl)-2-propanonoxime, 8d, are monoclinic, a = 7.010(2)

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Winiarska-Mieczan, Anna, Karolina Jachimowicz, Małgorzata Kwiecień, et al. "The Impact of Zn, Cu and Fe Chelates on the Fatty-Acid Profile and Dietary Value of Broiler-Chicken Thigh Meat." Animals 11, no. 11 (2021): 3115. http://dx.doi.org/10.3390/ani11113115.

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This study aimed to compare the effect of Zn, Cu and Fe glycine chelates on the proximate composition, cholesterol levels, fatty-acid profile and dietary value of the thigh meat of broiler chickens. The experiment involved three hundred and fifty Ross 308 chickens divided into seven groups. The chickens were administered Zn, Cu and Fe glycine chelates in an amount corresponding to 50% of the requirement or 25% of the requirement for 42 days. It was found that the use of Zn, Cu and Fe glycine chelates did affect the fatty acid profile and dietary value of meat. A positive impact was most freque

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MODAIHSH, A. S. "FOLIAR APPLICATION OF CHELATED AND NON-CHELATED METALS FOR SUPPLYING MICRONUTRIENTS TO WHEAT GROWN ON CALCAREOUS SOIL." Experimental Agriculture 33, no. 2 (1997): 237–45. http://dx.doi.org/10.1017/s001447979700001x.

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A field experiment was conducted from 1992 to 1994 to study the effect of supplying micronutrients to wheat (Triticum aestivum L., cv. Yecora rojo) grown on calcareous soil. Chelated and/or non-chelated forms of Fe, Mn, Zn and Cu were administered through a wide range of foliar applications, sprayed either individually or in combination. All the chelated micronutrients were applied in the form of EDTA with the exception of Fe (EDDHA). However, all the non-chelated elements were in the form of sulphate. The grain yield was significantly increased by the application of individual micronutrients

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T. A. Vasini, A. Sh. Chkuaseli, A. A. Chagelishvili, I. A. Beshkenadze, N. A. Klarjeishvili, and M. N. Tchikaidze. "Synthesis and study of arginine-containing iodine chelates." World Journal of Advanced Research and Reviews 25, no. 1 (2025): 2424–32. https://doi.org/10.30574/wjarr.2025.25.1.0278.

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Synthesis conditions have been established and arginine (Arg) containing iodine chelate compounds with the general formula: IXArgY·mH2O (where x = y = 1 or 2; m=1 ÷3) have been synthesized. The synthesized chelates have been studied using a number of physical and chemical research methods. Composition has been determined by means of trace element analysis, while individuality – via melting temperature measurement and diffractographic method. It has been established via study of qualitative solubility in different solvents that chelates are highly soluble in water and poorly soluble in organic

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32

Iamze Alim Beshkenadze, Giorgi Apolon Kozmanishvili, Leila Konstantine Japaridze, Eteri Shalva Salukvadze, Nino Ushangi Nonikashvili, and Lia Dimitri Gogua. "Synthesis and study of Arginin-containing copper and chrome chelates." World Journal of Advanced Research and Reviews 22, no. 3 (2024): 1708–14. http://dx.doi.org/10.30574/wjarr.2024.22.3.1775.

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Synthesis conditions have been established and arginin (Arg)-containing copper and chrome chelate compounds with the following general formulas: CuArgn(CH3COO)2·mH2O and CrArgn(CH3COO)3·mH2O (where n =1÷3; m=2 or 4) have been synthesized. Synthesized chelates have been studied using a number of physical and chemical research methods. In particular, their composition has been established via trace element analysis, while the individuality has been identified through melting temperature measurement and diffractographic method. Through study of qualitative solubility in different solvents there h

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I., Beshkenadze, Klarjeishvili N., M.Gogaladze, M.Tchikaidze, and Ts.Gabelia. "Synthesis and study of Arginin-containing iron and cobalt chelates." World Journal of Advanced Research and Reviews 21, no. 1 (2024): 2576–83. https://doi.org/10.5281/zenodo.13377664.

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Synthesis conditions have been established and arginin-containing iron and cobalt chelate compounds with general formula: Me(Arg)n(CH<sub>3</sub>COO)<sub>2</sub>·mH<sub>2</sub>O, where Me = Fe, Co;  Arg – neutral arginin molecule, n = 1÷3; m = 1÷4 have been synthesized. Synthesized chelates have been studied using a number of physical and chemical methods. In particular, the content has been established via trace element analysis, while individuality has been identified using melting temperature measurement and diffractographic method. According to study of qual

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34

Varshney, Anshita, and A. P. Mishra. "Novel Ni(II) and Zn(II) Schiff base metal chelates as promising DNA binder, Antioxidant and Antifungal agents." Mediterranean Journal of Chemistry 14, no. 2 (2024): 94. http://dx.doi.org/10.13171/mjc02405211777varshney.

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<p>Schiff base ligands and their 3d-metal chelates have gained significant attention due to various applications in various scientific platforms. Due to their chelating propensity, they possess a wide range of biological, biochemical, catalytic, clinical, dying, and pharmacological properties.<strong> </strong>Here, in present studies,<strong> </strong>two novel Ni(II) and Zn(II) transition metal chelates have been synthesized by condensing their metal salts with Schiff base ligand 4-chloro-2-(2,5-dimethoxybenzylideneamino)-5-nitrophenol<strong> </strong&

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35

Bultreys, Alain, Isabelle Gheysen, Henri Maraite, and Edmond de Hoffmann. "Characterization of Fluorescent and Nonfluorescent Peptide Siderophores Produced by Pseudomonas syringaeStrains and Their Potential Use in Strain Identification." Applied and Environmental Microbiology 67, no. 4 (2001): 1718–27. http://dx.doi.org/10.1128/aem.67.4.1718-1727.2001.

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ABSTRACT Nonfluorescent highly virulent strains of Pseudomonas syringae pv. aptata isolated in different European countries and in Uruguay produce a nonfluorescent peptide siderophore, the production of which is iron repressed and specific to these strains. The amino acid composition of this siderophore is identical to that of the dominant fluorescent peptide siderophore produced by fluorescentP. syringae strains, and the molecular masses of the respective Fe(III) chelates are 1,177 and 1,175 atomic mass units. The unchelated nonfluorescent siderophore is converted into the fluorescent siderop

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36

Thakulla, Dharti, and Paul R. Fisher. "Effects of Cold Plasma and Ozone Water Treatment on Micronutrient Solubility." Horticulturae 9, no. 5 (2023): 568. http://dx.doi.org/10.3390/horticulturae9050568.

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Cold plasma and ozone sanitation of irrigation solutions can oxidize both microbes and non-target micronutrients because their high oxidation-reduction potential (ORP) is a non-selective mode of action. The objective of this study was to evaluate the effects of cold plasma and ozone treatment on oxidation of iron and manganese in nutrient solutions containing one of four iron chelates (iron-ethylenediaminetetraacetic acid (Fe-EDTA), iron-diethylenetriaminepentaacetic acid (Fe-DTPA), iron-ethylenediamine-N,N′-bis(2-hydroxyphenylacetic acid) (Fe-EDDHA), and hydroxybenzyl ethylenediamine (Fe-HBED

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37

Tong, Bihai, Hsiao-Yun Ku, I. Jen Chen, et al. "Heteroleptic Ir(iii) phosphors with bis-tridentate chelating architecture for high efficiency OLEDs." Journal of Materials Chemistry C 3, no. 14 (2015): 3460–71. http://dx.doi.org/10.1039/c5tc00163c.

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GOMAN, N. V., I. A. BOBRENKO, V. V. POPOVA, and A. A. GAIDAR. "AGROCHEMICAL REGULATORY INDICATORS OF MINERAL NUTRITION OF SPRING WHEAT IN THE FOREST STEPPE OF WESTERN SIBERIA." Izvestiâ Timirâzevskoj selʹskohozâjstvennoj akademii, no. 1 (2021): 5–17. http://dx.doi.org/10.26897/0021-342x-2021-1-5-17.

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The authors studied the influence of different methods of using micronutrient fertilizers on the yield of spring wheat grain and established standard agrochemical indicators of mineral nutrition on the grassland-chernozem soil of the Omsk region. Use was made of helated micronutrient fertilizers (zinc and copper). Chelated micronutrient fertilizers are an organic complex of a microelement with a chelating agent, in which the microelement is freely absorbed by the plant. The advantages of chelated micronutrient fertilizers are an increase in the availability of trace elements, because these com

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39

Mohamed, Amira A., Fatma M. Ahmed, Wael A. Zordok, Walaa H. El-Shwiniy, Sadeek A. Sadeek, and Hazem S. Elshafie. "Novel Enrofloxacin Schiff Base Metal Complexes: Synthesis, Spectroscopic Characterization, Computational Simulation and Antimicrobial Investigation against Some Food and Phyto-Pathogens." Inorganics 10, no. 11 (2022): 177. http://dx.doi.org/10.3390/inorganics10110177.

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Condensation of the reaction between enrofloxacin and ethylenediamine in the existence of glacial acetic acid produced a new N,N-ethylene (bis 1-cyclopropyl-7-(4-ethylpiperazin-1-yl)-6-fluoro-1,4-dihydroquinoline-3-carboxylic acid Schiff base (H2Erx-en). H2Erx-en was used as a tetra-dentate ligand to produce novel complexes by interacting with metal ions iron(III), yttrium(III), zirconium(IV), and lanthanum(III). The synthetic H2Erx-en and its chelates had been detected with elemental analysis, spectroscopic methods, mass spectrometry, thermal studies, conductometric and magnetic measurements

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40

Wu, Hong Wei, Wan Cui Xie, Xi Hong Yang, Fu Rao Lai, Hui Wu, and Dong Wei Cheng. "Influence of Chelation Rate on the Oligochitosan Preparation by Enzymolysis of CTS-Cu (II)." Advanced Materials Research 962-965 (June 2014): 1252–57. http://dx.doi.org/10.4028/www.scientific.net/amr.962-965.1252.

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To prepare a homogenous low-molecular-weight chitosan oligosaccharide with high solubility and physiological activity, the CTS-Cu (II) chelate was degraded by cellulose, xylanase, semi-cellulase, pectinase, lipase. Cellulose was used to investigate the enzymolysis of the CTS-Cu (II) chelates at various chelation rates. The oligochitosan yields were determined by ultrafiltration and spectrophotometry. The molecular weight distributions of the degradation products were compared by gel column chromatography. Results showed that the generation of the CTS-Cu (II) chelate promoted chitosan degradati

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41

Sasikala T, Greeshma KP, Gnana Priya K, Muthulingam S, and Nandhakumar C. "Synthesis, characterization and chelating properties of tannin-8-hydroxy quinoline - formaldehyde polymer." GSC Advanced Research and Reviews 5, no. 2 (2020): 019–23. http://dx.doi.org/10.30574/gscarr.2020.5.2.0083.

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Tannin obtained from Eucalyptus plant, condensed with formaldehyde and then 8-hydroxy quinoline. The so called obtained polymer designated as TFQ was used for metal chelate formation. Thus Transition metal chelates of TFQ with Zn+2, Co+2, Cu+2, Ni+2 and Mn+2 metal ions were prepared. The ligand TFQ and its all five metal chelates were characterized by nitrogen content, IR, UV-Visible spectral studies, magnetic moments and thermogravimetry. The antimicrobial activity of all the samples has also been monitored against common microbes.

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42

Lane, Aiden M., Ny T. C. Luong, Jordan C. Kelly, et al. "Synthetic Exploration of Bis(phenolate) Aza-BODIPYs and Heavier Group 13 Chelates." Molecules 27, no. 23 (2022): 8256. http://dx.doi.org/10.3390/molecules27238256.

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A series of boron, aluminum, gallium, and indium chelates containing the underexplored bis(phenolate) aza-dipyrromethene (aza-DIPY) core were prepared. These compounds were found to possess near-infrared absorption and emission profiles in the 710 to 770 nm domain and exhibit quantum yield values up to 14%. X-ray diffraction analysis revealed that heavier group 13 bis(phenolate) aza-DIPY chelates possessed octahedral geometries with either THF or pyridine groups occupying the axial positions as opposed to the tetrahedral geometry of the boron chelate.

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43

B., R. ARBAD. "Copper and Uranyl Chelates of Substituted Succinic and Malonic Acids in Dioxane-Water Mixtures." Journal of Indian Chemical Society Vol. 62, Aug 1985 (1985): 566–68. https://doi.org/10.5281/zenodo.6318670.

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Department of Chemistry, Marathwada University, Aurangabad-431 004 <em>Manuscript received 4 June 1982, revised 6 September 1983, accepted 30 August 1985</em> Carboxymethylthiosuccinic acid (CMTSA) has three dissociable COOH groups, whose <em>p</em>K values (2.91, 3.91, 5.03) have been determined by various methods of calculations. Copper and uranyl chelates of substituted succinic and malonic acids have been studied by Calvin-Bjerrum potentiometric titration technique at 30° and 0.1 <em>M </em>ionic strength. It was observed that Cu<sup>lI</sup> forms 1 : 1 and 1 : 2 chelates with ma

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44

Glinushkin, Alexey, Svetlana Akimova, Elena Nikulina, et al. "Preliminary Study: Micropropagation Using Five Types of Chelated Iron and the Subsequent Acclimation of Blue Honeysuckle (Lonicera caerulea var. kamtschatica Sevast.)." Forests 14, no. 4 (2023): 821. http://dx.doi.org/10.3390/f14040821.

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Blue honeysuckle (Lonicera caerulea var. kamtschatica Sevast.) is a valuable berry crop with a unique biochemical composition. It is rich in vitamins, minerals, and biologically active substances. Different species and cultivars of honeysuckle require different cultivation conditions in the field of accelerated reproduction in vitro. Taking into account the high clonal replication potential of the plant, we conducted research on the chelated-iron form’s influence on the micropropagation productivity of the blue honeysuckle “Lulia” cultivar at the multiplication, rooting, and subsequent acclima

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45

Makarova, Anna, Elena Nikulina, Tatiana Avdeenkova, and Ksenia Pishaeva. "The Improved Phytoextraction of Heavy Metals and the Growth of Trifolium repens L.: The Role of K2HEDP and Plant Growth Regulators Alone and in Combination." Sustainability 13, no. 5 (2021): 2432. http://dx.doi.org/10.3390/su13052432.

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Heavy metals are among the most widespread pollutants in soil. Phytoextraction technology is used to solve the problem of multi-metal-contaminated soil. The efficiency of this process can be increased by introducing various amendments. A soil amendment is any material added to a soil to improve its physical properties, such as water retention, permeability, water infiltration, drainage, aeration, and structure. Some chemical amendments for enhanced phytoextraction, such as amino polycarboxylates chelators, can be hazardous to the environment and perform poorly at pH > 8. The effect of the p

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46

Noguchi, Daisuke. "ANALYSIS OF SPECIALTIES OF CRYSTAL STRUCTURE FOR NON-CHELATE CONFORMATIONS OF ETHYLENE-DIAMINETETRAACETIC ACID AND ITS SALTS WITH ALKALI AND ALKALINE EARTH METALS." Ukrainian Chemistry Journal 88, no. 10 (2022): 55–69. http://dx.doi.org/10.33609/2708-129x.88.10.2022.55-69.

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In the present study, the crystal structures of non-chelating EDTA molecules and their non-chelation salts in a zwitterionic state, along with the EDTA-chelates of alkali and alkaline earth metals, were searched and overviewed. 25 non-chelating molecules of EDTA, and zwitterions of ethylenediammonium-diacetate diacetic acid HOOC-CH2-(-OOC-CH2-)NH+-CH2-CH2-NH+(-CH2-COO-)-CH2-COOH and their salts (ethylenediammonium-tetraacetic acid (HOOC-CH2-)2NH+-CH2-CH2-NH+(-CH2-COOH)2, ethylenediammonium-acetate triacetic acid (HOOC-CH2-)2NH+-CH2-CH2-NH+(-CH2-COO-)-CH2-COOH, and ethylenediammonium-tetraacet

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47

Gorbachev, V. V., I. A. Nikitin, S. L. Tikhonov, et al. "Assessment of the prospects of using chelated forms of zinc to create new types of food products." Food systems 7, no. 4 (2025): 568–74. https://doi.org/10.21323/2618-9771-2024-7-4-568-574.

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The prospects of using some chelated forms of zinc to develop new enriched food products are substantiated in the work. The authors give a brief description of the synthesis of chelated double forms: Zn diglycinate, Zn pantothenate-glycinate, Zn thiaminate-glycinate, Zn citrate, Zn cysteinate-glycinate. Synthesis of chelates included the stages of treatment of Zn compounds with amino acids and vitamins with partial heating, as well as ultrasound treatment at a frequency of 25 kHz to create micro-nanoparticles and to accelerate formation of chelates. Authenticity of obtained compounds was deter

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48

Iamze, Alim Beshkenadze, Apolon Kozmanishvili Giorgi, Konstantine Japaridze Leila, Shalva Salukvadze Eteri, Ushangi Nonikashvili Nino, and Dimitri Gogua Lia. "Synthesis and study of Arginin-containing copper and chrome chelates." World Journal of Advanced Research and Reviews 22, no. 3 (2024): 1708–14. https://doi.org/10.5281/zenodo.14760344.

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Synthesis conditions have been established and arginin (Arg)-containing copper and chrome chelate compounds with the following general formulas: CuArg<sub>n</sub>(CH<sub>3</sub>COO)<sub>2</sub>·mH<sub>2</sub>O and CrArg<sub>n</sub>(CH<sub>3</sub>COO)<sub>3</sub>·mH<sub>2</sub>O (where n =1÷3;  m=2 or 4) have been synthesized. Synthesized chelates have been studied using a number of physical and chemical research methods. In particular, their composition has been established via trace element analysis, while the individuality has been identified through melting tempera

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Malikova, Hana, and Michal Holesta. "Gadolinium Contrast Agents - Are they Really Safe?" Journal of Vascular Access 18, no. 2_suppl (2017): S1—S7. http://dx.doi.org/10.5301/jva.5000713.

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Gadolinium-based contrast agents (GBCA) are used worldwide for enhanced MRI examinations, including heart and vessels. Gadolinium is a highly toxic heavy metal. If used in GBCA it must be tightly bound to ligands. The configuration of ligands influences the stability of the GBCA and two types of chelates have been used. Macrocyclic chelates offer better protection and binding of gadolinium ion than linear chelates with a flexible open chain - gadolinium could be more easily released from the latter ones. GBCAs are excreted from the body mostly by the kidneys, which is of importance in chronic

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50

Sasikala, T., KP Greeshma, Priya K. Gnana, S. Muthulingam, and C. Nandhakumar. "Synthesis, characterization and chelating properties of tannin-8-hydroxy quinoline - formaldehyde polymer." GSC Advanced Research and Reviews 5, no. 2 (2020): 019–23. https://doi.org/10.5281/zenodo.4319550.

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Tannin obtained from Eucalyptus plant, condensed with formaldehyde and then 8-hydroxy quinoline. The so called obtained polymer designated as TFQ was used for metal chelate formation. Thus Transition metal chelates of TFQ with Zn<sup>+2</sup>, Co<sup>+2</sup>, Cu<sup>+2</sup>, Ni<sup>+2</sup> and Mn<sup>+2</sup> metal ions were prepared. The ligand TFQ and its all five metal chelates were characterized by nitrogen content, IR, UV-Visible spectral studies, magnetic moments and thermogravimetry.   The antimicrobial activity of all the samples has also been monitored against c

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