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Volumn 45, Issue 8, 2004, Pages 1643-1646

Efficient and selective transport of ω-amino acids across a bulk chloroform membrane by a macrocyclic dicopper(II) complex

Author keywords

Amino acid transport; Copper(II); Macrocyclic receptor; Molecular recognition; Supramolecular chemistry

Indexed keywords

CHLOROFORM; COPPER COMPLEX; LIGAND; MACROCYCLIC COMPOUND; OMEGA AMINO ACID;

EID: 0842283443     PISSN: 00404039     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.tetlet.2003.12.125     Document Type: Article
Times cited : (6)

References (38)
  • 1
    • 0003495713 scopus 로고
    • For an overview see: S.M. Roberts. London: The Royal Society of Chemistry
    • For an overview see: Roberts S.M. Molecular Recognition, Chemical and Biochemical Problems. 1989;The Royal Society of Chemistry, London.
    • (1989) Molecular Recognition, Chemical and Biochemical Problems
  • 2
    • 0003461218 scopus 로고    scopus 로고
    • For an excellent collection of reviews on molecular recognition see: J.L. Atwood, J.E.D. Davies, D.D. Macnicol, & F. Vögtle. Exeter: Elsevier
    • For an excellent collection of reviews on molecular recognition see: Atwood J.L., Davies J.E.D., Macnicol D.D., Vögtle F. Comprehensive Supramolecular Chemistry. 1996;Elsevier, Exeter.
    • (1996) Comprehensive Supramolecular Chemistry
  • 32
    • 85030907958 scopus 로고    scopus 로고
    • note
    • 2: C, 79.49; H, 9.22; N, 8.18; Found: C, 79.02; H, 9.31, N, 8.09.
  • 33
    • 85030903087 scopus 로고    scopus 로고
    • note
    • 3O: C, 79.00; H, 9.44; N, 8.37; Found: C, 78.72; H, 9.48, N, 8.26.
  • 35
    • 85030912037 scopus 로고    scopus 로고
    • note
    • 2. The tube was immersed in a thermostatic bath kept at 25°C. The stirring speed of the magnetic bar was >200 rpm. Above this value the rate of transport does not depend on the stirring speed.
  • 36
    • 85030893196 scopus 로고    scopus 로고
    • In these experiments the metal ion is transported at a higher rate than the amino acids and this is probably related to the formation of a ternary complex comprising two ligands and two metal ions (or two ligand and one metal ion in the case of 2 ). This ternary complex is productive as a Cu(II) carrier but not as an amino acid carrier and competes with the ternary complex comprising ligand, copper and amino acid. This behaviour has already been observed. It has been ascribed to a lower affinity for the metal ion of the amino acid with respect to the ligand (see Ref. [4d]).
  • 37
    • 85030907672 scopus 로고    scopus 로고
    • note
    • This is based on the rough assumption that the binding constant of the second Cu(II) ion by the macrocycle is the same as that of the first one. Quite likely it is lower (see Ref. 8) and, as a consequence, the transport efficiency of the macrocycle is underestimated.
  • 38
    • 85030912079 scopus 로고    scopus 로고
    • note
    • The apparent binding constants of the carriers for the three amino acids were obtained by interpolation of the rate of transport as a function of carrier concentration (see Fig. 2 for 1 and β-Phe) plots by using a Michaelis-Menten-like equation. In the case of α- and γ-amino acids the curvature of the profiles was less defined than that of the β-analogue and, therefore, the error in the determination of the formation constant is probably higher. However, since we are considering ratios of constants the effect of the error is somehow minimized.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.