ジエチレントリアミン五酢酸 diethylenetriamine pentaacetic acid

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2014/09/13 15:31:45」(JST)

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Pentetic acid or diethylene triamine pentaacetic acid (DTPA) is an aminopolycarboxylic acid consisting of a diethylenetriamine backbone with five carboxymethyl groups. The molecule can be viewed as an expanded version of EDTA and is used similarly. It is a white, water-soluble solid.

Coordination properties

The conjugate base of DTPA has a high affinity for metal cations. Thus, the penta-anion DTPA^5- is potentially an octadentate ligand assuming that each nitrogen centre and each COO^–-group counts as a centre for coordination. The formation constants for its complexes are about 100 greater than those for EDTA.^[3] As a chelating agent, DTPA wraps around a metal ion by forming up to eight bonds. Transition metals, however, usually form less than eight coordination bonds. So, after forming a complex with a metal, DTPA still has the ability to bind to other reagents, as is shown by its derivative pendetide. For example, in its complex with copper(II), DTPA binds in a hexadentate manner utilizing the three amine centres and three of the five carboxylates.^[4]

Applications

Like the more common EDTA, DTPA is mainly used for sequestering metal ions that otherwise decompose hydrogen peroxide, which is used to bleach pulp in paper making. Several million kilograms are produced for this purpose annually.^[3]

Its chelating properties are useful in deactivating calcium and magnesium ions in hair products. DTPA is used in over 150 cosmetic products.^[5] Additionally, DTPA is used in MRI contrasting agents. DTPA improves MRI images by forming a complex with a gadolinium ion, which alters the properties of nearby water molecules.^[6]

DTPA has been considered for treatment of radioactive materials such as plutonium, americium, and other actinides. In theory, these complexes are more apt to be eliminated in urine. It is normally administered as the calcium or zinc salt, since these ions are readily displaced by more highly charged cations. DTPA forms complexes with thorium(IV), uranium(IV), neptunium(IV), and cerium(III/IV).^[7]

DTPA is also used as a chelate for aquarium plant fertilizer, specifically iron, an essential micronutrient typically needed in substantial quantities by all plants. Chelates are dissolved organic substances that bind to metals and prevent them from forming larger molecules through oxidation. FeDTPA is often sold under the name iron chelate 10% or 11% when used for the purpose of aquarium plant fertilization. Iron typically found in the aquarium water column has been converted into the ferric state (Fe+3) since it's in the presence of dissolved oxygen. However plants require iron in the ferrous state (Fe+2), therefore additional energy must be expended in order to extract the ferric iron from the water column and convert it to the ferrous form. When used to chelate iron fertilizer DTPA ensures that the iron is kept in the ferrous state (Fe+2) over time so it can be utilized by aquatic plants without expending valuable energy.

Related compounds

Compounds that are structurally related to DTPA are used in medicine, taking advantage of the high affinity of the triaminopentacarboxylate scaffold for metal ions.

In ibritumomab tiuxetan, the chelator tiuxetan is a modified version of DTPA whose carbon backbone contains an isothiocyanatobenzyl and a methyl group.^[8]
In capromab pendetide and satumomab pendetide, the chelator pendetide (GYK-DTPA) is a modified DTPA containing a peptide linker used to connect the chelate to an antibody.^[9]
Pentetreotide is a modified DTPA attached to a peptide segment.^[10]
DTPA and derivatives are used to chelate gadolinium to form a MRI contrast agent, such as Magnevist.
Technetium is chelated with DTPA for ventilation perfusion scan (V/Q scan) and renal scan.^{[citation needed]}

References

^ Anonymous Pentetic Acid. In Dictionary of Organic Compounds, Sixth Edition; Buckingham, J., Macdonald, F., Eds.; CRC Press: 1996; Vol. 5, pp 1188.
^ Moeller, T.; Thompson, L. C. Observations on the rare earths—LXXV(1): The stabilities of diethylenetriaminepentaacetic acid chelates. Journal of Inorganic and Nuclear Chemistry 1962, 24, 499.
^ ^a ^b J. Roger Hart "Ethylenediaminetetraacetic Acid and Related Chelating Agents" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2005.doi:10.1002/14356007.a10_095
^ V. V. Fomenko, T. N. Polynova, M. A. Porai-Koshits, G. L. Varlamova and N. I. Pechurova Crystal structure of copper (II) diethylenetriaminepentaacetate monohydrate Journal of Structural Chemistry, 1973, Vol. 14, 529. doi:10.1007/BF00747020
^ Burnett, L. C. "Final Report on the Safety Assessment of Pentasodium Pentetate and Pentetic Acid as Used in Cosmetics" International Journal of Toxicology 2008, 27, 71-92.
^ Caravan, Peter; Ellison, Jeffrey J.; McMurry, Thomas J. ; Lauffer, Randall B. "Gadolinium(III) Chelates as MRI Contrast Agents: Structure, Dynamics, and Applications" Chem. Revs. 1999, volume 99, pp. 2293–2342.
^ (2) Brown, M. A.; Paulenova, A.; Gelis, A. V. "Aqueous Complexation of Thorium(IV), Uranium(IV), Neptunium(IV), Plutonium(III/IV), and Cerium(III/IV) with DTPA" Inorganic Chemistry 2012, volume 51, 7741-7748. doi:10.1021/ic300757k
^ Milenic, Diane E.; Erik D. Brady; Martin W. Brechbiel (June 2004). "Antibody-targeted radiation cancer therapy". Nat Rev Drug Discov 3 (6): 488–99. doi:10.1038/nrd1413. ISSN 1474-1776. PMID 15173838.
^ Kahn, Daniel; J. Christopher Austin; Robert T Maguire; Sara J Miller; Jack Gerstbrein; Richard D Williams (1999). "A Phase II Study of [90Y] Yttrium-Capromab Pendetide in the Treatment of Men with Prostate Cancer Recurrence Following Radical Prostatectomy". Cancer Biotherapy & Radiopharmaceuticals 14 (2): 99–111. doi:10.1089/cbr.1999.14.99.
^ Liu, Shuang (2008-09-15). "Bifunctional coupling agents for radiolabeling of biomolecules and target-specific delivery of metallic radionuclides". Advanced Drug Delivery Reviews 60 (12): 1347–70. doi:10.1016/j.addr.2008.04.006. ISSN 0169-409X. PMC 2539110. PMID 18538888.

This article incorporates material from Facts about DTPA, a fact sheet produced by the United States Centers for Disease Control and Prevention.

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Related Pictures

PPT - Renal Scintigraphy PowerPoint Presentation - ID:222145 Scans.. Dr.Padmesh DMSA Renal Scintigraphy File:99mTc-MAG3 and 99mTc-DTPA renogram.jpg - Wikimedia Commons DTPA - Diethylenetriamine Pentaacetic Acid in Medical & Science by AcronymsAndSlang.com DTPA anhydride | Dojindo Nuclear imaging in kidney disease

★リンクテーブル★

リンク元	「ジエチレントリアミン五酢酸」「99mTc-ジエチレントリアミン五酢酸」「diethylenetriaminepentaacetate」
拡張検索	「インジウムDTPA」「テクネDTPA」「Gd-DTPA」「GdDTPA-BMA」
関連記事	「DT」

「ジエチレントリアミン五酢酸」

Pentetic acid
	IUPAC name 2-[Bis[2-[bis(carboxymethyl)amino]ethyl]amino]acetic acid
	Other names DTPA; H5dtpa; Diethylenetriaminepentaacetic acid; Penta(carboxymethyl)diethylenetriamine
Identifiers
CAS number	67-43-6
PubChem	3053, 6441444 (Zinc-DTPA)
ChemSpider	2945
UNII	7A314HQM0I
KEGG	D05422
ChEBI	CHEBI:35739
ChEMBL	CHEMBL780
RTECS number	MB8205000
Jmol-3D images	Image 1
	SMILES C(CN(CC(=O)O)CC(=O)O)N(CCN(CC(=O)O)CC(=O)O)CC(=O)O ;
	InChI InChI=1S/C14H23N3O10/c18-10(19)5-15(1-3-16(6-11(20)21)7-12(22)23)2-4-17(8-13(24)25)9-14(26)27/h1-9H2,(H,18,19)(H,20,21)(H,22,23)(H,24,25)(H,26,27) ; Key: QPCDCPDFJACHGM-UHFFFAOYSA-N ;
Properties
Molecular formula	C14H23N3O10
Molar mass	393.35 g mol−1
Appearance	White crystalline solid
Melting point	220 °C (428 °F; 493 K)
Boiling point	decomposes at a higher temp.
Solubility in water	<0.5 g/100 mL
Acidity (pKa)	~1.80 (20°C)
Hazards
Flash point	Non-flammable
Related compounds
Related compounds	EDTA, NTA
	Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
	(verify) (what is: /?)
	Infobox references

　　[★]

英: diethylenetriamine pentaacetic acid, DTPA, diethylenetriaminepentaacetate
同: ジエチレントリアミン5酢酸、ジエチレントリアミンペンタ酢酸、ジエチレントリアミペンタアセテート酸; ペンテト酸 pentetic acid
関: テクネチウム99m-DTPA、Gd-DTPA、111In-DTPA

この構造式ではGdをキレートしている
キレート剤
indium-111-DTPA：111In-ジエチレントリアミン五酢酸
technetium-99m-DTPA：腎シンチグラフィー

参考

1. 構造式

http://www.chemicalbook.com/ChemicalProductProperty_JP_CB5497704.htm

2. wiki en

3. 化粧品の成分でもある

http://gennavi.com/?p=1145

「99mTc-ジエチレントリアミン五酢酸」

　　[★]

英: technetium(99mTc) diethylenetriamine pentaacetic acid, technetium-99m-DTPA, 99mTc-DTPA
同: テクネチウム99m-DTPA
商: ジエチレントリアミン五酢酸テクネチウム(99mTc)
関: ジエチレントリアミン五酢酸 diethylenetriamine pentaacetic acid DTPA。腎シンチグラフィ

「diethylenetriaminepentaacetate」

　　[★] ジエチレントリアミン五酢酸 DTPA

「インジウムDTPA」

　　[★]

関: 放射性医薬品

「テクネDTPA」

　　[★] ジエチレントリアミン五酢酸

関: 放射性医薬品

「Gd-DTPA」

　　[★]

同: ガドリニウム

「GdDTPA-BMA」

　　[★] ガドジアミド水和物

「DT」

　　[★]

[1] Anonymous Pentetic Acid. In Dictionary of Organic Compounds, Sixth Edition; Buckingham, J., Macdonald, F., Eds.; CRC Press: 1996; Vol. 5, pp 1188.

[2] Moeller, T.; Thompson, L. C. Observations on the rare earths—LXXV(1): The stabilities of diethylenetriaminepentaacetic acid chelates. Journal of Inorganic and Nuclear Chemistry 1962, 24, 499.

[Ullmann-3] J. Roger Hart "Ethylenediaminetetraacetic Acid and Related Chelating Agents" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2005.doi:10.1002/14356007.a10_095

[4] V. V. Fomenko, T. N. Polynova, M. A. Porai-Koshits, G. L. Varlamova and N. I. Pechurova Crystal structure of copper (II) diethylenetriaminepentaacetate monohydrate Journal of Structural Chemistry, 1973, Vol. 14, 529. doi:10.1007/BF00747020

[5] Burnett, L. C. "Final Report on the Safety Assessment of Pentasodium Pentetate and Pentetic Acid as Used in Cosmetics" International Journal of Toxicology 2008, 27, 71-92.

[6] Caravan, Peter; Ellison, Jeffrey J.; McMurry, Thomas J. ; Lauffer, Randall B. "Gadolinium(III) Chelates as MRI Contrast Agents: Structure, Dynamics, and Applications" Chem. Revs. 1999, volume 99, pp. 2293–2342.

[7] (2) Brown, M. A.; Paulenova, A.; Gelis, A. V. "Aqueous Complexation of Thorium(IV), Uranium(IV), Neptunium(IV), Plutonium(III/IV), and Cerium(III/IV) with DTPA" Inorganic Chemistry 2012, volume 51, 7741-7748. doi:10.1021/ic300757k

[8] Milenic, Diane E.; Erik D. Brady; Martin W. Brechbiel (June 2004). "Antibody-targeted radiation cancer therapy". Nat Rev Drug Discov 3 (6): 488–99. doi:10.1038/nrd1413. ISSN 1474-1776. PMID 15173838.

[9] Kahn, Daniel; J. Christopher Austin; Robert T Maguire; Sara J Miller; Jack Gerstbrein; Richard D Williams (1999). "A Phase II Study of [90Y] Yttrium-Capromab Pendetide in the Treatment of Men with Prostate Cancer Recurrence Following Radical Prostatectomy". Cancer Biotherapy & Radiopharmaceuticals 14 (2): 99–111. doi:10.1089/cbr.1999.14.99.

[10] Liu, Shuang (2008-09-15). "Bifunctional coupling agents for radiolabeling of biomolecules and target-specific delivery of metallic radionuclides". Advanced Drug Delivery Reviews 60 (12): 1347–70. doi:10.1016/j.addr.2008.04.006. ISSN 0169-409X. PMC 2539110. PMID 18538888.

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DTPA