Diethylenetriamine tetraacetate

Bishydrated complexes formed with diethylenetriamine tetraacetate (DTTA4, Scheme 2) ligands attached to various scaffolds have been also investigated (35-37). The stability constants determined for the Gd11 (complexes formed with DTTA-chelators attached to a benzene or a bipyridine core were all in the range of... 

Paraquat dichloride [1910-42-5] Pentasodium diethylenetriamine tetraacetate >8,600 - Young et ah, 1996... 

Metals may also be linked through an oxygen or nitrogen atom to form a stable metal complex without a carbon-metal bond. These include metal complexes of ethylenediamine tetraacetate (EDTA), diethylenetriamine pentaacetate (DTPA), or ethylenediamine tetramethylphosphonate (EDTMP). Metalloid compounds include antimonyl gluconate and bismuth salicylate. 

A number of dissociative enhancement immunoassays have been developed using Eu3+ or Sm3+ complexed to a proprietary chelator, A -f/j-isothiocyanatobenzyl]-diethylenetriamine-A1, A2, A3, A3-tetraacetate (Figure 14.7)/1 70 This chelator is cou-... 

DCTA 1,2-diaminocyclohexane tetraacetic acid DBP dibutyl phosphoric acid DTP A diethylenetriamine pentaacetic acid DEHPA di-2-ethylhexyl phosphoric acid... 

In the condensed chelate systems, many kinds of chelating agents were used, such as ethylenediamiiie-/V,/V,/V, /V -tetraacetic acid (EDTA), nitrilotriacetic acid (NTA), /-aspartic acid (AA), trimethylenediamine (TMD), /V,/V-dimethylethylenedi-amine (DMED), diethylenetriamine (DETA), triethylenetetraamine (TETA), and t ris(2-aminoethyl)amine (TAEA) (6). The chelating agents used are listed in Table 3.2.1. 

EDTA, ethylenediamine tetraacetic acid NTA, nitrilotriacetic acid HEEDTA, hydroxy-ethylethylene EDTA DTPA, diethylenetriamine pentaacetic acid EDDDA, ethylene diamine-/V,/V -diacetic-/V,/V -dipropionic acid EDDA, /V,/V -ethylene diamine diacetic acid CyDTA, cyclohexylene diamine tetraacetic acid. 

There is a close relationship between the metabolism of the shoot and the root. It is generally accepted that the xylem forms the main path for upward movement of water and ions from the roots to the leaves. Most of the essential major elements are transported in the xylem as inorganic ions. Nitrogen may be transported along the xylem as N03 if it is present in the external solution as nitrate. However, the plant sap may also contain organic nitrogen compounds such as amino acids. In the xylem, heavy metals will usually only be transported if special chelates are formed, eg, by citrate (Streit and Stumm, 1993). Iron is taken up and transported more readily when supplied as a chelated complex, such as ferric ethylenediamine tetraacetate (FeEDTA) or as ferric diethylenetriamine pentaacetate (FeDTPA) (Wallace and North, 1953). Calcium may also be transported in a chelated form (Jacoby, 1966). 

Quintana, J.B. and Reemtsma, T. Rapid and sensitive determination of ethylenediamine tetraacetic acid and diethylenetriamine pentaacetic acid in water samples by ion-pair reversed-phase hquid chromatography-electrospray tandem mass spectrometry. /. 

Such experiments show that oxalate, tartrate, and citrate give fairly strong complexes, and indeed these mixtures do not suffer quite such rapid oxidation as the other systems (57, 70). Stability constants for the complexing of U(III) by acetate, 2-hydroxy-2-methylpropionate, nitriloacetate, trans-cyclohexyl-1,2-diaminotetraacetate, ethylenedi-amine tetraacetate, and diethylenetriamine pentaacetate have been reported, but no pure compounds have been isolated (71). Thiocyanate also accelerates oxidation of the uranium, but the blue complex that is formed can be extracted with triethyl phosphate, tributyl phosphate, or better, trioctyl phosphine oxide the organic extract decomposes only slowly (45, 72). 

Other metal cations that may form complexes with the toxicant may have a profound effect on toxicity. The toxicity of ethylenedi-amine tetraacetic acid (EDTA) and diethylenetriamine pentaacetic acid (DTPA) and their metal complexes has been examined in daphnids. The results are relevant both for the effect on the toxicity of metal cations and for the influence of complexation on these toxicities. For the acute toxicity (ECS0, 24 h) to Daphnia magna, the following results (mg/1) were obtained (Sorvari and Silanpaa 1996) ... 

The DELFIA labelling reagents are the Eu- qt Sm-chelates of N-(p-isothiocyanatobenzyl)-diethylenetriamine-N, N, N, N -tetraacetic acid (DTTA) (Fig 4) (12) or one of the fluorescent chelates (Figure 6). 

AGE, advanced glycation end product CML, A -carboxymethyl-L-lysine DMF, AiV-dimethylformamide DOTA, 1,4,7,10-tetraazacyclododecane-l,4,7,10-tetraacetate DTPA, diethylenetriamine pentaaeetate FAD, flavin adenine dinucleotide FN3K, fiuctosamine-3-kinase GLUTS, glucose transporter-5 GTP, guanidine triphosphate ... 

Synonyms Calcium diethylene triamine pentaacetic acid Calcium DTPA Calcium pentetate Calcium trisodium diethylene triamine pentaacetate Diethylenetriamine pentaacetic acid, calcium trisodium salt Pentetate calcium trisodium Pentetate trisodium calcium Trisodium [(carboxymethyl) imino] bis (ethylenenitrilo) tetraacetate Empihcal CuHisCaNsNasOio Formula CaNasCuHisNaOio Properties Solid sol. in water insol. in alcohol m.w. 497.36... 

The nitroblue tetrazolium method has the main advantage of sensitivity. Oberley and Spitz (1985) used diethylenetriamine-pentaacetic acid (DETA-PAC) instead of ethylenediamine tetraacetic acid (EDTA), as they found that DETAPAC enhances the... 

Another system for the polymerization of amylamide are chelating polyaminocarboxylic acids with Ce(IV) [146-148]. In these systems, the redox reaction is followed by a decarboxylation to yield the initiating carbon-centered radical. It w found that diethylenetriamine pentaacetic acid (DTPA) is slightly mcwe effective than ethylenediamine tetraacetic acid (EDTA). The efficiency of nitrilotriacctic acid (NDA) [see Eq. (48)] is smaller than that of EDTA. 

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