1,2-diaminocyclohexane tetraacetic acid

FIGURE 1.1 Structures of organic compounds referred to in the text (a) sucrose (also known as saccharose), (b) dimethyl sulfoxide (DMSO), (c) dimethylformamide (DMF), (d) sorbitol, (e) mannitol, (f) nitrilotriacetic acid (NTA), (g) citric acid, (h) N,N,N, N -fran,s-1,2-diaminocyclohexane-tetraacetic acid (CyTA), (i) saccharic acid, (j) glutamic acid. 

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

Willems et al. [20] proposed on-column desalting using 1,2-diaminocyclohexane-tetraacetic acid (CDTA), ammonium acetate, formic acid, or acetic acid prior to chromatographic separation on a 300-pm-ID microcapillary column. Desalting by the addition of EDTA was also reported [21],... 

Early work on the dark red compound of Mn111 with edta suggested that its structure was K[Mn(edta)H20] 1.5H20.661 However, X-ray work shows the compound to possess an octahedral structure with a sexadentate edta residue. Axial bond length distortion is observed, with two tram O atoms being 2.050 and 2.022 A from the Mn atom, while the two equatorial Mn—O bonds are 1.907 and 1.889 A and the two Mn—O bonds are 2.211 and 2.237 A.662 A very similar structural result was found in the case where edta was replaced by franj-l,2-diaminocyclohexane tetraacetic acid in K[Mn(L)]-H20.663... 

CDTA trans-l,2-diaminocyclohexane-N,N,N,N-tetraacetic acid CMP cytidine S -monophosphate... 

Hydrated compounds of the type U02(H2L) xH20 have been reported for 1,2-diamino-propane-Af.NjA jAf -tetraacetic acid (x unspecified), tram diaminocyclohexane-N,N,N, N -tetraacetic acid (x = 0 or 3 (U02)2L-xH20, with x = 0 or 6 also known), 2,2 -diaminodiethyl ether-A, A,N, N -tetraacetic acid (x = 3), and 2,2 -diaminodiethyl sulfide-N,N,N, N -tetra-acetic acid (x = 0 or 4) the hydrates are predpitated from aqueous media, but in the last instance a mixture of ethanol and acetone was added to induce precipitation. The analogous di(2-aminoethoxy)ethane-/V, N,N, N -tetraacetic acid (H4L) forms the compounds... 

NTA = nitrilotriacetic acid, HEDTA = hydroxy-2-ethytenediaminetriacetic acid, CyDTA = trans-1,2-diaminocyclohexane-jV, A1, N, jV -tetraacetic acid, DTPA - diethylenetriaminepentaacetic add, EGTA = ethyleneglycolbis(2-aminoethyl)-Ar,Ar -tetraacetic add, EDTA = ethylenediaminetetraacetic acid, TTHA = triethylenetetraminetetraacetic add, PIDA = jV-(2-pyridylmethyl)iminodiacetic add, CyDA = cydohexyiiminodiacetic add. 

Diaminocyclohexane-N,N -tetraacetic acid Glycine, N,N -1,2-cyclohexanediylbis N-(carboxymethyl)-... 

The addition of chelating agents such as /ranx-l,2-diaminocyclohexane-lV,yV,yV, yV -tetraacetic acid (CDTA) and/or triethylamine (TEA), removes the bound transition-metal cations and Mg + ions from RNAs and enhances mass measurement accuracy [9]. Figure 13.5, the ESI spectrum of E. coli 5S rRNA (120 nt), demonstrates the utility of this approach. Before acquiring the ESI mass spectrum, the sample of rRNA was precipitated from 2.5 M ammonium acetate solution, and 500 pmol of CDTA and 10 tiL of 0.1% TEA solution were added. Two major rRNA components were detected. In the absence of CDTA and TEA, no useful data could be obtained. 

EGTA, ethyleneglycol bis(2-aminoethyl ether)-A/,A/,W, W -tetraacetic acid DTNB, 5,5 -dithiobis-(2-nitrobenzoic acid) MTB, Methyl-thymol Blue PT, pyridoxal thiosemicarbazone DGT, dipyridylglyoxal dithiocarbazone HMF, 3-hydroxy-7-methoxyflavone TCSP, 5,10,15,20-tetrakis-(3-chloro-4-sulfophenyl)porphine BSD, relative standard deviation PAR 4- 2 -pyridylazo)resorcinol DCTA, 1,2-diaminocyclohexane-N,N,N, N tetraacetic acid. 

Other EDTA-type compounds are sometimes used as titrants, including 1,2-diaminocyclohexane-N,N,N, N -tetraacetic acid, which generally forms stronger complexes than EDTA, and nitrilotriacetic acid, which generally forms weaker complexes than EDTA (Figure 7). 

Solutions of chromiumni salts, on being boiled with a solution of the disodium salt of l,2-diaminocyclohexane-N,N,N, N -tetraacetic acid (chenta acid), gives a reddish-violet solution. Under these conditions, dichromate solutions do not undergo reduction. This behavior is the basis of a spot test for chromiumjfii compounds in the presence of chromium . Cu, Co and Ni salts interfere because they form colored complexes with the reagent. 

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