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Academic literature on the topic 'Chelates'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 June 2025

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Journal articles on the topic "Chelates"

1

Hu, Xiao, Sai Rui Ma, Yan Yan Wu, Lai Hao Li, Xian Qing Yang, Shu Xian Hao, Sheng Jun Chen, and Wan Ling Lin. "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 were highest in the chelates, and the lipid peroxidation inhibition activity of the chelate III was obviously higher than that of TPH. Compared with TPH, marked changes in microstructure were observed in the biological material of TPH-iron chelate.

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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 (September 7, 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 response of the animals against many infections. The term chelate is derived from a Greek word “chele” which means claw. Chele refers to the claw like structure of the chelate molecule, suggested by the open V-shape of the two ligands on two sides, with the mineral ion in the centre. Various chelates include metal amino acid chelates, metal polysaccharide complexes and yeast derivative complexes <em>etc.</em> A number of trace elements in their organic form have been prepared, but only few of them have been studied. This mineral chelates provide better nutrition, grater bioavailability and increased stability of the minerals in the body.

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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 Blue in clonal micropropagation technology. The best results were obtained using Fe(III)-DTPA in increased (×1.5) and doubled (×2.0) concentrations, where the multiplication factor was 4.59-4.65.

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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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5

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 (August 5, 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 derived fromp-amidinosalicylaldehyde and D-tryptophan (chelate1g'in original paper) have shown exceptionally potent inhibitory activity against thrombin (Ki= 2.7×10-8M). To elucidate the structural basis of this high efficient inhibition, we were planning to determine and compare with four protein-inhibitor complex structures, chelate1g'or2g'bound to trypsin or thrombin (chelate2g'is derived fromm-amidinosalicylaldehyde and D-Trp). The crystals of trypsin binding the chelate2g'was obtained by sitting-drop vapor diffusion method by mixing 2.5 μL of 20 mg/mL protein-chelate complex solution with 2.5 μL of 0.1 M HEPES, pH 7.4, containing 0.1 M Li2(SO4), 25.0% PEG 3350. In the crystal structure, the imidazole nitrogen of His57 is coordinated with the copper(II) ion (1.94 Å). This close contact is made possible by conformation change of the His57. The indole ring of the chelate2g'simultaneously interacts with the copper(II) and the His57 by cation-π and π-π stacking interaction, respectively. In addition to trypsin-chelate2g'complex structure, we will report on the other three complex structures of trypsin-chelate1g', thrombin-chelate1g'and thrombin-chelate2g'.

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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 (March 13, 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, molecular docking was investigated against two different proteins: the ribosyltransferase enzyme (code: 3GEY) and the EGFR tyrosine kinase receptor (code: 1m17).

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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 (September 1, 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 on adults fish and eggs was 0.5 mg/l. The genotoxic effect on erythrocytes of fish blood was not found in the entire range of sublethal concentrations. Comparison of the data obtained on the toxicity in this study allows asserting that the toxicity of chelates is lower than that of the ionic forms of the elements, subject to their complex effect. To accurately determine the safe level of exposure to chelates, additional studies on other organisms of the hydrobiocenosis are required.

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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 leading to a stable six-membered chelate ring involving the hydrazone nitrogen and the hydrogen bonded carbonyl oxygen. The Ni(II) and Zn(II) chelates are diamagnetic, while the Cu(II) complexes are paramagnetic. In the metal complexes of the naphthylazo derivatives of acetylacetone and methylacetoacetate, the acetyl carbonyl is involved in coordination, whereas in the chelates of the naphthylazo derivative of acetoacetanilide, the anilide carbonyl is bonded with the metal ion.

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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 (July 19, 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 remediate the calcareous soil with black gram as a test crop. Iron content in black gram (above ground mass) tented to fluctuate at different growth stages. The highest shoot iron content of 325, 351 and 347 mg kg-1 at vegetative, flowering and harvest stages were recorded with 1% ferrous glycinate as foliar spraying on 25 and 45 Day after sowing (DAS). The root iron content was also higher in 1% ferrous glycinate as foliar spraying on 25 and 45 DAS. The current investigation affirmed that the utilizing different chelating agents like the ferrous glycinate were powerful than ferrous sulfate, which may build the iron substance and iron take-up of blackgram in various development stages.

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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 chelate ring.

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Dissertations / Theses on the topic "Chelates"

1

Hogg, John Kirtley. "Conformation of metal chelates." Thesis, University of Bristol, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259482.

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Vohra, A. A. "Nickel chelates as dyes." Thesis, University of Manchester, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.601469.

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The chelates of seven commercial disperse dyes with nickel, copper and chromium have been formed in cotton and in nylon 6 fabrics. Exhaustion dyeing was satisfactory on nylon 6 and subsequent treatment in the metal salt solution at optimum pH was followed by steaming. The cotton was pretreated with a urea/melamine precondensate with glyoxal formaldehyde, and a polyethylene glycol. Dye was introduced by vapor-transfer from coated paper. Chelation was achieved in a final step. The hue and brightness, fastness to Light, washing and perspiration were assessed for the dyed fabrics. The nickel complexes were in general found to be slightly better than the chromium and copper complexes. Photodegeration of the fibres was reduced by the presence of the nickel complexes. Average stabilisation of nylon 6 was found to be 43% and that of cotton 23%. It may be possible to use selected nickel chelates as dyes that stabilise photodegradabLe fibres. The amount of nickel reacting with the dyed cotton fabric was determined by employing atomic absorption spectroscopy.

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Mistry, Jayshree. "Oat phytoalexins and magnesium chelates." Thesis, University of Nottingham, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.276204.

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Smith, Raymond John. "New chelates for protein radiolabelling." Thesis, University of Kent, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357228.

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5

Wubs, Harm Jan. "Application of iron chelates in hydrodesulphurisation." [S.l. : [Groningen : s.n.] ; University Library Groningen] [Host], 1994. http://irs.ub.rug.nl/ppn/298191733.

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Boros, Eszter. "Acyclic chelates for imaging with radiometals." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/44437.

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This thesis investigates acyclic chelates containing pyridine, carboxylate and amino groups and their fast and efficient and stable coordination of the (radio-)metals ⁹⁹mTc, Re, Cu, ⁶⁴Cu, Ga, ⁶⁷/⁶⁸Ga. The radiometals mentioned are all of significant interest for SPECT (single photon emission computed tomography) and PET (positron emission tomography) imaging, two of the most important non-invasive diagnostic tools in the clinic. The design, synthesis, radiolabelling, evaluation of stability, and in vivo investigation are presented for three variably charged, novel, short C₈ chain derivatized chelates for the [M(CO)₃]+ core (M = ⁹⁹mTc or Re). Distinct localization of these small amphiphilic molecules in vivo was studied via biodistribution and imaging and was found to be dependent on the charge of the polar moiety. In an attempt to identify a universal chelate applicable to the [M(CO)₃]+ core and ⁶⁴Cu, the synthesis of the dipin bifunctional chelate system, capable of fast coordination of Cu, its radionuclide ⁶⁴Cu, as well as the [M(CO)₃]+ core (M = ⁹⁹mTc, Re) is described. The versatility of the dipin ligand system is based on its ability to adopt a variety of binding modes, tridentate when protected, tetradentate when deprotected. Based on this small, tetradentate scaffold, a series of acyclic chelates with varying bite angle and denticity were synthesized and screened for their ability to coordinate radioisotopes of Ga and Cu under mild conditions within a short period of time. It was found that the linear N₄O₂ chelate H₂dedpa coordinates ⁶⁷/⁶⁸Ga quantitatively to form [⁶⁷Ga(dedpa)]+ after 10 min at room temperature with exceptional kinetic inertness towards human apo-transferrin. The corresponding ⁶⁴Cu complex maintains inertness against serum proteins within 2 h, but shows 23 % transchelation to serum proteins after 24 h. Both potential small molecule perfusion agents, as well as peptide conjugated versions as applications of the H2dedpa scaffold are reported. Both types of derivatives maintained the labelling and radiolabelled complex (⁶⁷/⁶⁸Ga and ⁶⁴Cu) stability properties found with the non-derivatized versions, further indicating the H₂dedpa scaffold is a useful platform for the development of clinically applicable radiopharmaceuticals.

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Mitra, Amitabha. "GROUP 13 CHELATES IN PHOSPHATE DEALKYLATION." UKnowledge, 2006. http://uknowledge.uky.edu/gradschool_diss/293.

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A series of mononuclear boron halides of the type LBX2 (LH = N-phenyl-3,5-di-tbutylsalicylaldimine,X = Cl (2), Br (3)) and LBX ( LH2 = N-(2-hydroxyphenyl)-3,5-di-tbutylsalicylaldimine,X = Cl (7), Br (8); LH2 = N-(2-hydroxyethyl)-3,5-di-tbutylsalicylaldimine,X = Cl (9), Br (10); LH2= N-(3-hydroxypropyl)-3,5-di-tbutylsalicylaldimine,X = Cl (11), Br (12)) were synthesized from their borate precursorsLB(OMe)2 (1) (LH = N-phenyl-3,5-di-t-butylsalicylaldimine ) and LB(OMe) (LH2 = N-(2-hydroxyphenyl)-3,5-di-t-butylsalicylaldimine (4), N-(2-hydroxyethyl)-3,5-di-tbutylsalicylaldimine(5), N-(3-hydroxypropyl)-3,5-di-t-butylsalicylaldimine (6)). Theborate precursors, 1, 4 - 6, in turn, were prepared by refluxing the corresponding ligandsLH or LH2 with excess B(OMe)3. The boron halide compounds were air- and moisturesensitiveand compound 7 on hydrolysis gave the oxo-bridged compound 13 thatcontained two seven-membered boron heterocycles. The boron halide compoundsdealkylated trimethyl phosphate in stoichiometric reactions to produce methyl halide andunidentified phosphate materials. Compounds 8 and 12 were found to be the mosteffective dealkylating agents. Compound 8 on reaction with t-butyl diphenyl phosphinateproduced a unique boron phosphinate compound LB(O)OPPh2 (14) containing a terminalphosphinate group. Compounds 1-14 were characterized by 1H, 13C, 11B, 31P NMR, IR,MS, EA and MP. Compounds 5, 6, 11, 12 and 13 were also characterized by singlecrystalX-ray diffraction.The alkane elimination reaction between Salen(tBu)H2 ligands and diethylaluminumbromide was used to prepare the four Salen aluminum bromide compounds,salen(tBu)AlBr (15) (salen = N,N'-ethylenebis(3,5-di-tert-butylsalicylideneimine)),salpen(tBu)AlBr (16) (salpen = N,N'-propylenebis(3,5-di-tert-butylsalicylideneimine)),salben(tBu)AlBr (17) (salben = N,N'-butylenebis(3,5-di-tert-butylsalicylideneimine)) andsalophen(tBu)AlBr (18) (salophen = N,N'-o-phenylenenebis(3,5-di-tertbutylsalicylideneimine)).The compounds contained five-coordinate aluminum either in adistorted square planar or a trigonal bipyramidal environment. The bromide group inthese compounds could be displaced by triphenylphosphine oxide or triphenyl phosphateto produce the six-coordinate cationic aluminum compounds [salen(tBu)Al(Ph3PO)2]Br(19), [salpen(tBu)Al(Ph3PO)2]Br (20), [salophen(tBu)Al(Ph3PO)2]Br (21) and[salophen(tBu)Al{(PhO)3PO}2]Br (22). All the compounds were characterized by 1H,13C, 27Al and 31P NMR, IR, mass spectrometry and melting point. Furthermore,compounds 15, 16, 17, 18, 20, 21 and 22 were structurally characterized by single-crystalX-ray diffraction. Compounds 15, 17 and 18 dealkylated a series of organophosphates instoichiometric reaction by breaking the ester C–O bond. Also, they promoted thedealkylation reaction between trimethyl phosphate and added boron tribromide.Stoichiometric reaction of compound 15 with trimethyl phosphate produced thealuminophosphinate compound salen(tBu)AlOP(O)Ph2 (23). Compound 16 on reactionwith tributyl phosphate produced the aluminophosphate compound[salpen(tBu)AlO]2[(BuO)2PO]2 (24). Compounds 23 and 24 were characterized by singlecrystalX-ray diffraction and spectroscopically.

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8

Pornsinlapatip, Pornpun. "Flow-injection solvent extraction of metal chelates." Thesis, Queen's University Belfast, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.284394.

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de, Witt G. Charmaine. "Biodistribution and biospeciation of samarium-153 chelates." Thesis, de Witt, G. Charmaine (1996) Biodistribution and biospeciation of samarium-153 chelates. PhD thesis, Murdoch University, 1996. https://researchrepository.murdoch.edu.au/id/eprint/51690/.

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Tumour localisation and biodistribution of several samarium-153 complexes have been investigated by evaluation of the speciation of these complexes in blood plasma using potentiometric titration data and computer modelling. Furthermore, the results of the simulations have been used to propose explanations of the observed biodistributions. Tissue distribution studies were used to evaluate the localisation of the samarium-153 complexes of the ligands DTPA, HEDTA, HIDA, BZ, PBH, PIH, NTA, citrate and chloride in C57/6J black mice bearing either melanotic or amelanotic B16 melanomas. The mice were sacrificed at 1, 6, 24 or 48 hours after injection and the tumours and other organs of interest removed and measured for radioactivity against a known standard. Tumour imaging studies were also performed. Appreciable tumour uptake was achieved with all of the complexes, with the exception of Sm-DTPA although the degree of uptake was less than that of gallium-67 citrate. Visualisation of the tumours after administration of many of the samarium-153 complexes was precluded by a high degree of hepatic localisation. The most favourable images were obtained after administration of 153Sm-HEDTA, with the implanted tumour being visible at all times in images performed from 1 to 48 hours. In order to further understand the bioinorganic chemistry of samarium in the presence of such chelating agents, the protonation constants of citric acid, HEDTA, EDTMP and salicylic acid, as well as the formation constants of their complexes with samarium(III) and yttrium(III), were measured by potentiometric titration and the data analysed using the ESTA suite of programs. The distribution of these complexes as a function of pH was also calculated. The results obtained from the potentiometric studies were incorporated in blood plasma modelling using the computer program ECCLES to determine both the relative strengths of the complexes in aqueous solution and their speciation in blood plasma. Simulation results indicate that, in aqueous solution, HEDTA is the strongest of the complexing agents for both samarium(III) and yttrium(III) while citrate is the weakest. The complexes of yttrium(III) appear to be generally weaker than those of samarium(III). The ligand HEDTA is also the most effective complexing agent in vivo. Computer simulations also indicate that samarium is predominantly complexed as the [SmCit]0 and [SmHEDTA]0 species when administered with citrate and HEDTA, respectively. The formation of these neutral species accounts for the high degree of hepatic localisation observed in the biodistribution studies. In contrast, the major samarium species formed with EDTMP appear to be [SmEDTMP]5- [Sm(EDTMP)H-1]6-. The formation of these charged species would explain why the and complex is excreted almost exclusively via the kidneys. The major competitive interactions for the complexes of Sm-HEDTA in vivo appear to be those of endogenous ligands for the metal ion. In the case of Sm-EDTMP, however, competition for the ligand by endogenous calcium ions takes precedence. This suggests a possible mechanism for the observed localisation of 153Sm-EDTMP in bone metastases.

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10

Eapen, M. J. "Solvent extraction of some transition metal chelates." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 1986. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/3279.

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Books on the topic "Chelates"

1

Dzhardimalieva, Gulzhian I., and Igor E. Uflyand. Chemistry of Polymeric Metal Chelates. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-56024-3.

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Günther, Winkelmann, ed. CRC handbook of microbial iron chelates. Boca Raton: CRC Press, 1991.

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Uflyand, Igor E., and Gulzhian I. Dzhardimalieva. Nanomaterials Preparation by Thermolysis of Metal Chelates. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-93405-1.

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J, Graff Darrell, and Ashmead Harvey H, eds. Intestinal absorption of metal ions and chelates. Springfield, Ill., U.S.A: C.C. Thomas, 1985.

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Mayer, Michael. Farbe und Konstitution bei H-Chelaten der Pyrazinreihe: Präparative und spektroskopische Untersuchungen. Konstanz: Hartung-Gorre, 1985.

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Pomogaĭlo, A. D. Makromolekuli͡a︡rnye metallokhelaty. Moskva: "Khimii͡a︡", 1991.

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DeWayne, Ashmead H., ed. Foliar feeding of plants with amino acid chelates. Park Ridge, N.J., U.S.A: Noyes Publications, 1986.

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Haas, L. A. Influence of chelating reagents on leaching of copper ore. Pittsburgh, Pa: U.S. Dept. of the Interior, Bureau of Mines, 1985.

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Sowoidnich, Werner. Neue Chelate der Benzthiazol- und Benzobisthiazolreihe: Darstellung und spektroskopische Eigenschaften. Konstanz: Hartung-Gorre, 1989.

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(Firm), Knovel, ed. The roles of amino acid chelates in animal nutrition. Park Ridge, N.J: Noyes Publications, 1993.

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Book chapters on the topic "Chelates"

1

Krause, Ronald A., Adrienne Wickenden Kozlowski, James L. Cronin, and Rosario Del Pilar Neira. "3. Polysulfide Chelates." In Inorganic Syntheses, 12–16. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132524.ch3.

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Keck, H., W. Kuchen, J. Mathow, W. K. Miller, L. Tanner, L. L. Wright, C. J. Casewit, and M. Rakowski Dubois. "Molybdenum-Sulfur Cluster Chelates." In Inorganic Syntheses, 118–22. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132548.ch23.

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Morcos, Sameh K. "Gadolinium Chelates and Stability." In Medical Radiology, 175–80. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/174_2013_895.

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Crompton, T. R. "Chromatography of Metal Chelates." In Comprehensive Organometallic Analysis, 504–78. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4615-9498-7_7.

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Toner, John L. "Lanthanide Chelates as Luminescent Probes." In Inclusion Phenomena and Molecular Recognition, 185–97. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4613-0603-0_19.

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Uflyand, Igor E., and Gulzhian I. Dzhardimalieva. "Thermolysis of Polymeric Metal Chelates." In Nanomaterials Preparation by Thermolysis of Metal Chelates, 247–350. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-93405-1_4.

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Runge, Val M., and Johannes T. Heverhagen. "New High-Relaxivity Gd Chelates." In The Physics of Clinical MR Taught Through Images, 114–15. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-85413-3_53.

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Volkert, Wynn A., and Silvia Jurisson. "Technetium-99m chelates as radiopharmaceuticals." In Topics in Current Chemistry, 123–48. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/3-540-59469-8_5.

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Dzhardimalieva, Gulzhian I., and Igor E. Uflyand. "General Introduction." In Chemistry of Polymeric Metal Chelates, 1–12. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-56024-3_1.

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Dzhardimalieva, Gulzhian I., and Igor E. Uflyand. "Polymer Chelating Ligands: Classification, Synthesis, Structure, and Chemical Transformations." In Chemistry of Polymeric Metal Chelates, 13–197. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-56024-3_2.

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Conference papers on the topic "Chelates"

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Tunnicliffe, Matthew. "The Effect of Extractives on the Passivation of Carbon Steel in Synthetic Black Liquor Environments." In CORROSION 2018, 1–15. NACE International, 2018. https://doi.org/10.5006/c2018-11374.

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Abstract Not all kraft mills have corrosion concerns in black liquor environments despite operating with similar temperatures, sulphidity and caustic content. There is reason to believe this change in liquor corrosivity is due to the presence of softwood extractives. This study used a synthetic solution to simulate weak black liquor environments (5 g/L sodium hydroxide and 20 g/L sodium sulphide) at 160°C to perform laboratory experiments. These experiments used a K02700 (A516 grade 70 carbon steel) working electrode to perform potentiodynamic, open circuit potential and immersion experiments to determine how liquor corrosivity changes in the presence of 1 or 5 g/L catechol, tannic acid or sodium citrate. These experiments were repeated in the presence of 1 g/L chloride in an attempt to increase the kinetics of corrosion. The catechol and tannic acid increased liquor corrosivity; however, the influence of 1 g/L chloride in the presence of an extractive was less clear. The reduced corrosion rate measured in the immersion studies in the presence of catechol, tannic acid and chloride is thought to do with the chloride interfering or binding with the chelates in solution rendering it less corrosive.

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Horvath, Jack W., Jose Cavallaro, and Craig Fissette. "A New Analytical Technique for Chemical Cleaning Solutions." In CORROSION 1987, 1–9. NACE International, 1987. https://doi.org/10.5006/c1987-87390.

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Abstract A new method was developed utilizing ion liquid chromatography (ILC) to analyze chelant boiler cleaning solutions. First efforts at analyzing Fe-Cu-(NH4)4 EDTA solutions encountered a separation problem. The iron and copper chelates were not separated enough to allow quantitative analysis of each. The problem was solved by changing the eluent composition. Linearity of chromatograph peak area versus concentration plots for each component was demonstrated and reproducibility confirmed. Commercial AA standards were used to prepare calibration solutions, and analytical data was confirmed by duplicate analyses of samples using separate analytical methods. The newly developed analytical method was first used in a mobile laboratory to analyze cleaning solutions during the cleaning of boiler number two and its economizer at Basin Electric Power Cooperative’s Laramie River Station near Wheatland, Wyoming. During the job, ILC analytical results were checked by titration and by spectrophotometric methods. Data from the different methods were found to be in close agreement. A major benefit of ILC for during the job boiler cleaning solution analyses is that three analytical tests are replaced by one procedure. This allows a single chemist or technician to better be able to keep up with frequent sampling schedules. Not being so hard pressed, he is better able to do careful work and produce accurate results.

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Azizah, Ninna Arifatun Nurul, Sentot Budi Rahardjo, Witri Wahyu Lestari, and Soerya Dewi Marliyana. "Synthesis and Characterization of Copper Complex Chelated with Phenobarbital Ligand." In 8th International Conference on Advanced Material for Better Future, 69–74. Switzerland: Trans Tech Publications Ltd, 2025. https://doi.org/10.4028/p-n2rlar.

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The research is intended to synthesize copper(II) with Phenobarbital (PB) complex in 1 : 4 mole ratio. The sole reflux method is designated to synthesize reactant within methanol solvent. Cu(II) complex is characterized using Atomic Absorption Spectrophotometry (AAS), UV-Vis Spectrophotometer, Fourier-transform Infrared Spectroscopy (FTIR), Thermogravimetric Analysis (TGA), Conductivity meter, and Magnetic Susceptibility Balance (MSB). The Cu(II)-PB complex signified 1 absorption peak at 517.5 nm with 2Eg → 2T2g transition. Complex is then composed by 6 electron donors of Cu ion-bound ligand, forming the octahedral geometry. Complex possesses the molecule formula of [Cu(PB)3]Cl2, this signifies only the PB that bound to Cu(II) ion as ligand through Oxygen and Nitrogen atom donors. There is no evidence of H2O molecules coordinated as ligand. Complex is electrolyte along with Cl- as counter ion that neutralized the complex charge. Complex is also being paramagnetic with the value of μeff of 1.74 BM.

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Ramos, Fernando D., Mat�as H. Ramos, Vanina Estrada, and M. Soledad Diaz. "Enhancing PHAs Production Sustainability: Biorefinery Design through Carbon Source Diversity." In Foundations of Computer-Aided Process Design, 868–75. Hamilton, Canada: PSE Press, 2024. http://dx.doi.org/10.69997/sct.150748.

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In this work, we propose a Mixed Integer Nonlinear Programming (MINLP) model to determine the optimal sustainable design of a poly(hydroxyalkanoate)s (PHAs) production plant configuration and its heat exchanger network (HEN). The superstructure-based optimization model considers different carbon sources as raw material: glycerol (crude and purified), corn starch, cassava starch, sugarcane sucrose and sugarcane molasses. The PHA extraction section includes four alternatives: the use of enzymes, solvent, surfactant-NaOCl or surfactant-chelate. Model constraints include detailed capital cost for equipment, mass and energy balances, product specifications and operating bounds on process units. To assess the feasibility of the PHA plant, we considered the Sustainability Net Present Value (SNPV) as the objective function, a multi-criteria sustainability metric that considers economic, environmental and social pillars. The Net Present Value (NPV) was also calculated. SNPV metric provides useful insights on sustainable PHA production, as the optimal technological route results in the sugarcane-surfactant-chelate option, rather than the sugarcane-enzyme pathway which proves more economically profitable, but with higher environmental impacts. Moreover, inclusion of HEN design significantly improves the objective function value, mainly due to a 24% carbon footprint impact reduction.

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Chen, Tao, Qiwei Wang, Frank Chang, and Esmael Albelharith. "Non-acidic Multi-Functional Iron Sulfide Scale Dissolver for High Temperature Sour Wells." In CORROSION 2018, 1–12. NACE International, 2018. https://doi.org/10.5006/c2018-11081.

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Abstract A non-acidic multifunctional iron sulfide scale dissolver has been developed as one of the efficient and cost-effective alternatives for removing iron sulfide dominated scale deposited both in the downhole tubular and near wellbore region. Compared with three typical conventional iron sulfide scale dissolvers (THPS, pH neutralized chelate and traditional chelate), this newly developed iron sulfide dissolver showed significantly better performance on pyrrhotite, calcite and field iron sulfide scales, and much less corrosive at high temperature. Different with the traditional HCl acid based iron sulfide scale dissolver, this new dissolver is non-corrosive, no H2S generation and iron sulfide re-precipitation problems, which is significantly improve the efficient and safe operations. In addition, the new developed iron sulfide dissolver showed multifunctional characteristic of well stimulation, addressed and confirmed by dynamic coreflood evaluation and CT scan technique. This paper introduces a new developed non-acid iron sulfide scale dissolver with multi-function of well stimulation, and gives a guideline of selection criteria and procedure for iron sulfide dissolver for high temperature application. It can be applied to iron sulfide dissolution in both sour oil and gas wells.

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Yektar, Şeyma, Gizem Kaleli-Can, Engin Baysoy, and Mustafa Kemal Ruhi. "Comparison of Photothermal Activity of Iron-and Manganese-Chelated Natural Melanin Nanoparticles." In 2024 Medical Technologies Congress (TIPTEKNO), 1–3. IEEE, 2024. http://dx.doi.org/10.1109/tiptekno63488.2024.10755259.

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Seçkin, İdil, Berk Kaleli, Efe Sönmez, Gizem Kaleli Can, Alpay Özcan, Bora Büyüksaraç, Senem Avaz Seven, and Engin Baysoy. "Coating of Nitinol Guidewire with Manganese Ion Chelated Natural Melanin Nanoparticles for MRI." In 2024 Medical Technologies Congress (TIPTEKNO), 1–4. IEEE, 2024. http://dx.doi.org/10.1109/tiptekno63488.2024.10755264.

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Ivanishin, Igor, and Hamidreza Samouei. "Chelating Agents as a Stimulation Fluid with a Negative Reaction Order: More Diluted Solutions React Faster with Carbonates." In SPE Annual Technical Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/206376-ms.

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Abstract Chelating agents are used to stimulate high-temperature carbonate reservoirs and remove mineral scales. For field applications, commercial chelates—EDTA, DTPA, GLDA, etc.—are commonly supplied as 3550 wt% (1.2-1.7 M) solutions and diluted two times in water. However, the dependence of the reaction rate on the concentration of chelate in solution has never been quantified. This paper focuses on determining the kinetics of calcite dissolution as a function of the dilution factor of commonly used chelates at acidic pH. Using a rotating disk apparatus, the kinetics of calcite marble dissolution in 0.10.25 M EDTA (pH=4.9-5.0), 0.1-0.25 M DTPA (pH=3.5-5.0), and 0.28-0.85 M GLDA (pH=3.7-5.0) solutions has been investigated. The dissolution of calcite in all chelates has a negative fractional-order that increases with temperature in the range -0.6 &lt; n&lt; -1.9. Thus, less concentrated chelate solutions react faster with calcite, and the effect of chelate dilution becomes less pronounced with a temperature increase. For example, three times dilution of pH=3.7 commercial GLDA solution—from commonly used 50 vol% (0.85 M) to 16.7 vol% (0.28 M)—increases calcite dissolution rate 8.4, 4.9, 2.7, and 2.0 times at 98.6, 116.6, 134.6, and 188.6°F, respectively. Dilution of pH=5.0 EDTA and pH=3.5 DTPA from 0.25 M to 0.1 M increases the dissolution rate of calcite 1.4-3.1 times at 98.6-188.6°F. Probable reasons for such an unusual reaction behavior are discussed in the paper. Presented results are integral for designing the stimulation operations in carbonate reservoir rocks and the removal of carbonate scales.

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Faris, Gregory W., and Megan Hryndza. "Properties of upconverting chelates." In International Symposium on Biomedical Optics, edited by Darryl J. Bornhop, David A. Dunn, Raymond P. Mariella, Jr., Catherine J. Murphy, Dan V. Nicolau, Shuming Nie, Michelle Palmer, and Ramesh Raghavachari. SPIE, 2002. http://dx.doi.org/10.1117/12.472111.

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Faris, Gregory W., and Mark J. Dyer. "Upconverting chelates for biomedical diagnostics." In Biomedical Optical Spectroscopy and Diagnostics. Washington, D.C.: OSA, 2000. http://dx.doi.org/10.1364/bosd.2000.md5.

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Reports on the topic "Chelates"

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Ali, S., and E. Shankland. sup 89 Zr chelates for antibody labelling. Office of Scientific and Technical Information (OSTI), January 1990. http://dx.doi.org/10.2172/6649657.

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Morgan, Roger J., and Aaron Harper. Polymer Chelates for Optical Amplification and Lasing Applications. Fort Belvoir, VA: Defense Technical Information Center, October 2001. http://dx.doi.org/10.21236/ada389263.

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Foote, Jefferson. Protein-Engineered Radiometal Chelates for Immunotherapy of Breast Cancer. Fort Belvoir, VA: Defense Technical Information Center, April 1998. http://dx.doi.org/10.21236/ada360809.

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Droege, P. Bifunctional chelates of RH-105 and AU199 as potential radiotherapeutic agents. Office of Scientific and Technical Information (OSTI), March 1997. http://dx.doi.org/10.2172/444055.

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Troutner, D. E., and E. O. Schlemper. Bifunctional chelates of Rh-105 and Au-199 as potential radiotherapeutic agents. Office of Scientific and Technical Information (OSTI), August 1987. http://dx.doi.org/10.2172/371297.

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Troutner, D., and E. Schlemper. Bifunctional chelates of Rh-105 and Au-199 as potential radiotherapeutic agents. Office of Scientific and Technical Information (OSTI), January 1990. http://dx.doi.org/10.2172/7170301.

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Payne, Katherine. Investigations into the Effects of Water Exchange and the Structure of Lanthanide Chelates. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.3275.

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Smith, K., B. Lani, D. Berisko, C. Schultz, W. Carlson, and L. B. Benson. Enhanced NO{sub x} removal in wet scrubbers using metal chelates. Final report, Volume 1. Office of Scientific and Technical Information (OSTI), December 1992. http://dx.doi.org/10.2172/48241.

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DeNardo, S. J. [Purification of Cu-67 and Macrocyclic chelates for targeted therapy]. DOE annual report, 1993--94. Office of Scientific and Technical Information (OSTI), December 1994. http://dx.doi.org/10.2172/569084.

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Crowley, David, Yitzhak Hadar, and Yona Chen. Rhizosphere Ecology of Plant-Beneficial Microorganisms. United States Department of Agriculture, February 2000. http://dx.doi.org/10.32747/2000.7695843.bard.

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Rhizoferrin, a siderophore produced by Rhizopus arrhizus, has been shown in previous studies to be an outstanding Fe carrier to plants. However, calculations based on stability constants and thermodynamic equilibrium lead to contradicting conclusions. In this study a kinetic approach was employed to elucidate this apparent contradiction and to determine the behavior of rhizoferrin under conditions representing soil and nutrient solutions. Stability of Fe3+ complexes in nutrient solution, rate of metal exchange with Ca, and rate of Fe extraction by the free ligand were monitored for rhizoferrin and other chelating agents by 55Fe labeling. Ferric complexes of rhizoferrin, desferri-ferrioxamine-B (DFOB), and ethylenediamine-di(o-hydroxyphenylacetic acid) (EDDHA) were found to be stable in nutrient solution at pH 7.5 for 31 days, while ferric complexes of ethylenediaminetetraacetic acid (EDTA) and mugineic acid (MA) lost 50% of the chelated Fe within 2 days. Fe-Ca exchange in Ca solutions at pH 8.7 revealed rhizoferrin to hold Fe at non-equilibrium state for 3-4 weeks at 3.3 mM Ca and for longer periods at lower Ca concentrations. EDTA lost the ferric ion at a faster rate under the same conditions. Fe extraction from freshly prepared Fe-hydroxide at pH 8.7 and with 3.2 mM Ca was slow and followed the order. DFOB > EDDHA > MA > rhizoferrin > EDTA. Based on these results we suggest that a kinetic rather than equilibrium approach should be the basis for predictions of Fe-chelates efficiency. We conclude that the non-equilibrium state of rhizoferrin is of crucial importance for its behavior as a Fe carrier to plants.

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