chelateadj.n.

Brit.

/ˈkiːleɪt/, U.S.

/ˈkiˌleɪt/

Etymology: < chela n.¹ + -ate suffix².

1. Zoology. Having chelæ or prehensile claws.

ΘΚΠ

the world > animals > invertebrates > phylum Arthropoda > [adjective] > of parts of > having chelae

cheliferous1759

chelate1803

chelicerate1890

1803 W. Bingley Animal Biogr. III. 470 Most of the animals of the present tribe [sc. crabs] have eight legs,..besides two chelate ones that serve the purpose of hands.

1826 W. Kirby & W. Spence Introd. Entomol. (1828) IV. xlvii. 397 Mandibles chelate.

1836–9 Todd's Cycl. Anat. & Physiol. II. 910 The chelate organs of Crustacea and Arachnida.

1880 T. H. Huxley Crayfish 22.

2. Chemistry. Applied to a group (ligand) that loops round a central metal ion to be attached at two or more points, and also to the co-ordination compound so formed. Hence as n., a chelate compound.

ΘΚΠ

the world > matter > chemistry > atomic chemistry > [adjective] > relating to ligards

chelate1920

1920 Morgan & Drew in Jrnl. Chem. Soc. 117 1457 The adjective ‘chelate’, derived from the great claw or ‘chela’ (‘chely’) of the lobster and other crustaceans, is suggested for these caliper-like groups which function as two associating units and fasten on to the central metallic atom so as to produce heterocyclic rings. Among the compounds which..function as chelate groups are ethylenediamine, [etc.].

1935 Nature 26 Jan. 147/2 Abnormally large differences in solubility and volatility between isomers of some disubstituted benzene derivatives have been explained..as arising from the presence of chelate rings in the anomalous compounds.

1955 Sci. News Let. 15 Oct. 248/2 These compounds, known as chelates.

1957 Sci. News 44 19 The so-called ‘chelate’ groups which are able to attach themselves at more than one position around the metal atom.

1965 C. S. G. Phillips & R. J. P. Williams Inorg. Chem. I. vii. 252 A chelate ligand such as ethylenediamine, which is able to occupy two coordinate positions around the copper (II) ion and thus displace two water molecules per ligand attached.

Derivatives

ˈchelate v. (transitive) to combine with (a substance) to form a chelate ring.

ΘΚΠ

the world > matter > chemistry > chemical reactions or processes > subject to chemical reactions or processes [verb (transitive)] > subject to named chemical reaction or process > chelate

chelate1946

1946 Nature 16 Nov. 708/1 The correspondence between the six-membered rings chelating the metal in both systems is apparent.

1961 Lancet 16 Sept. 638/2 We suggest that E.D.T.A. chelated the zinc of this exogenous hormone.

cheˈlated adj.

ΚΠ

1922 Morgan & Moss in Jrnl. Chem. Soc. 121 2862 A partly chelated lake was obtained by adding slowly a solution of..dinitrosoresorcinol.

1922 Morgan & Moss in Jrnl. Chem. Soc. 121 2865 The partially chelated compound.

cheˈlating n. and adj.

ΘΚΠ

the world > matter > chemistry > chemical reactions or processes > [adjective] > of or relating to named chemical reactions or processes > producing or of or relating to chelate compound

chelating1953

1953 Jrnl. Brit. Interplan. Soc. 12 162 It is difficult to keep all needed minerals in solution. For this purpose a chelating agent such as ethylene diamine tetracetic acid is commonly used.

1955 Sci. Amer. Aug. 39/1 The powerful chelating agent known as EDTA has a high affinity for plutonium and the rare earths.

1961 Lancet 16 Sept. 637/2 Clinical studies on the use of chelating agents in the treatment of various cardiovascular diseases.

cheˈlation n. the process producing a chelate compound.

ΘΚΠ

the world > matter > chemistry > chemical reactions or processes > [noun] > chemical reactions or processes (named) > chelation

chelation1932

1932 Jrnl. Chem. Soc. 952 (title) Chemical evidence of chelation in the sodium salts of o-hydroxybenzaldehydes.

1959 Sci. News 52 9 The attachment of two or more co-ordinate links from the same complexing molecule (ligand) to a single metal atom is usually known as chelation.

cheˈlator n. a substance producing a chelate compound.

ΘΚΠ

the world > matter > chemistry > chemical reactions or processes > [noun] > chemical reactions or processes (named) > chelation > chelator

chelator1958

1958 New Scientist 2 Oct. 941/1 Other lichen derivatives will come into increasing use as chelators in industrial chemistry.

Draft additions December 2005

chelation therapy n. therapy in which a chelating agent is used to lower abnormally high levels of a metal in the body, used to treat iron overload (as in haematological disorders), metabolic disorders such as Wilson's disease, and heavy metal poisoning, and also as a complementary therapy (of unproven efficacy) for other conditions.

ΚΠ

1960 H. Peters in M. Seven & L. Johnson Metal-Binding in Med. xxiii. 190/2 Elevation of urinary zinc levels from 2 to 36 times normal before chelation therapy..seemed to parallel symptoms more closely.

1982 Arch. Dis. Childhood 12 929 The desferrioxamine test was useful..in assessing response to chelation therapy thus enabling such treatment to be started early to prevent harm from iron overload.

2000 Record (Kitchener-Waterloo, Ont.) (Nexis) 5 Apr. a10 The U.S. federal trade commission ruled in 1988 that chelation therapy's claims of effectiveness for atherosclerosis are unsubstantiated.

2004 Current Med. Chem. 11 2161 Deferiprone..is effective and inexpensive to synthesise thus increasing the prospects of making it available to most thalassaemia patients in third world countries who are not currently receiving any form of chelation therapy.

This entry has not yet been fully updated (first published 1889; most recently modified version published online June 2022).

单词	chelate
释义	chelateadj.n. Brit. /ˈkiːleɪt/, U.S. /ˈkiˌleɪt/ Etymology: < chela n.¹ + -ate suffix². 1. Zoology. Having chelæ or prehensile claws. ΘΚΠ the world > animals > invertebrates > phylum Arthropoda > [adjective] > of parts of > having chelae cheliferous1759 chelate1803 chelicerate1890 1803 W. Bingley Animal Biogr. III. 470 Most of the animals of the present tribe [sc. crabs] have eight legs,..besides two chelate ones that serve the purpose of hands. 1826 W. Kirby & W. Spence Introd. Entomol. (1828) IV. xlvii. 397 Mandibles chelate. 1836–9 Todd's Cycl. Anat. & Physiol. II. 910 The chelate organs of Crustacea and Arachnida. 1880 T. H. Huxley Crayfish 22. 2. Chemistry. Applied to a group (ligand) that loops round a central metal ion to be attached at two or more points, and also to the co-ordination compound so formed. Hence as n., a chelate compound. ΘΚΠ the world > matter > chemistry > atomic chemistry > [adjective] > relating to ligards chelate1920 1920 Morgan & Drew in Jrnl. Chem. Soc. 117 1457 The adjective ‘chelate’, derived from the great claw or ‘chela’ (‘chely’) of the lobster and other crustaceans, is suggested for these caliper-like groups which function as two associating units and fasten on to the central metallic atom so as to produce heterocyclic rings. Among the compounds which..function as chelate groups are ethylenediamine, [etc.]. 1935 Nature 26 Jan. 147/2 Abnormally large differences in solubility and volatility between isomers of some disubstituted benzene derivatives have been explained..as arising from the presence of chelate rings in the anomalous compounds. 1955 Sci. News Let. 15 Oct. 248/2 These compounds, known as chelates. 1957 Sci. News 44 19 The so-called ‘chelate’ groups which are able to attach themselves at more than one position around the metal atom. 1965 C. S. G. Phillips & R. J. P. Williams Inorg. Chem. I. vii. 252 A chelate ligand such as ethylenediamine, which is able to occupy two coordinate positions around the copper (II) ion and thus displace two water molecules per ligand attached. Derivatives ˈchelate v. (transitive) to combine with (a substance) to form a chelate ring. ΘΚΠ the world > matter > chemistry > chemical reactions or processes > subject to chemical reactions or processes [verb (transitive)] > subject to named chemical reaction or process > chelate chelate1946 1946 Nature 16 Nov. 708/1 The correspondence between the six-membered rings chelating the metal in both systems is apparent. 1961 Lancet 16 Sept. 638/2 We suggest that E.D.T.A. chelated the zinc of this exogenous hormone. cheˈlated adj. ΚΠ 1922 Morgan & Moss in Jrnl. Chem. Soc. 121 2862 A partly chelated lake was obtained by adding slowly a solution of..dinitrosoresorcinol. 1922 Morgan & Moss in Jrnl. Chem. Soc. 121 2865 The partially chelated compound. cheˈlating n. and adj. ΘΚΠ the world > matter > chemistry > chemical reactions or processes > [adjective] > of or relating to named chemical reactions or processes > producing or of or relating to chelate compound chelating1953 1953 Jrnl. Brit. Interplan. Soc. 12 162 It is difficult to keep all needed minerals in solution. For this purpose a chelating agent such as ethylene diamine tetracetic acid is commonly used. 1955 Sci. Amer. Aug. 39/1 The powerful chelating agent known as EDTA has a high affinity for plutonium and the rare earths. 1961 Lancet 16 Sept. 637/2 Clinical studies on the use of chelating agents in the treatment of various cardiovascular diseases. cheˈlation n. the process producing a chelate compound. ΘΚΠ the world > matter > chemistry > chemical reactions or processes > [noun] > chemical reactions or processes (named) > chelation chelation1932 1932 Jrnl. Chem. Soc. 952 (title) Chemical evidence of chelation in the sodium salts of o-hydroxybenzaldehydes. 1959 Sci. News 52 9 The attachment of two or more co-ordinate links from the same complexing molecule (ligand) to a single metal atom is usually known as chelation. cheˈlator n. a substance producing a chelate compound. ΘΚΠ the world > matter > chemistry > chemical reactions or processes > [noun] > chemical reactions or processes (named) > chelation > chelator chelator1958 1958 New Scientist 2 Oct. 941/1 Other lichen derivatives will come into increasing use as chelators in industrial chemistry. Draft additions December 2005 chelation therapy n. therapy in which a chelating agent is used to lower abnormally high levels of a metal in the body, used to treat iron overload (as in haematological disorders), metabolic disorders such as Wilson's disease, and heavy metal poisoning, and also as a complementary therapy (of unproven efficacy) for other conditions. ΚΠ 1960 H. Peters in M. Seven & L. Johnson Metal-Binding in Med. xxiii. 190/2 Elevation of urinary zinc levels from 2 to 36 times normal before chelation therapy..seemed to parallel symptoms more closely. 1982 Arch. Dis. Childhood 12 929 The desferrioxamine test was useful..in assessing response to chelation therapy thus enabling such treatment to be started early to prevent harm from iron overload. 2000 Record (Kitchener-Waterloo, Ont.) (Nexis) 5 Apr. a10 The U.S. federal trade commission ruled in 1988 that chelation therapy's claims of effectiveness for atherosclerosis are unsubstantiated. 2004 Current Med. Chem. 11 2161 Deferiprone..is effective and inexpensive to synthesise thus increasing the prospects of making it available to most thalassaemia patients in third world countries who are not currently receiving any form of chelation therapy. This entry has not yet been fully updated (first published 1889; most recently modified version published online June 2022). < adj.n.1803
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