Author
Lino Hernández
Bio: Lino Hernández is an academic researcher from Simón Bolívar University. The author has contributed to research in topics: Amino acid & Blood serum. The author has an hindex of 6, co-authored 40 publications receiving 126 citations.
Papers
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TL;DR: Binary and ternary complexes of nickel(II) with dipicolinic acid (H 2 dipic) and the amino acids serine (Hser), threonine(Hthr), methionine (MHmet) and phenylalanine (PHphe) have been investigated in aqueous solutions at a 1.0 mol·dm − − 3 NaCl ionic strength and 25 °C as mentioned in this paper.
14 citations
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TL;DR: In this paper, the binary and ternary complexes of Nickel(II) with picolinic acid (Hpic) as a primary ligand and the small blood serum bioligands lactic acid, oxalic acid, citric acid, and phosphoric acid as biologically relevant secondary ligands were studied.
14 citations
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TL;DR: In this paper, the results of the speciation of the ternary vanadium(III)-1,10-Phennanthroline(Phen) and the amino acids glycine (HGly), proline (HPro), α-alanine (αAla), and β-ala (HβAla) by means of potentiometric measurements in 3.0 -mol −m −m−m−3 KCl at 25 −°C were presented.
11 citations
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TL;DR: In this paper, the formation of binary and ternary nickel(II) complexes involving dipicolinic acid (H2Dipic) as the primary ligand and some selected amino acids {glycine (HGly), ⍺-alanine(H⍺)-Ala), β-alanines (Hβ-Ala) and proline (HPro)} as secondary ligands were studied at 25 °C.
Abstract: In this paper we report the formation of binary and ternary nickel(II) complexes involving dipicolinic acid (H2Dipic) as the primary ligand and some selected amino acids {glycine (HGly), ⍺-alanine (H⍺-Ala), β-alanine (Hβ-Ala) and proline (HPro)} as secondary ligands. These complexes were studied at 25 °C by means of electromotive force measurements, emf(H), using 1.0 mol⋅dm−3 NaCl as the ionic medium. The experimental data were analyzed by means of the computational least-squares program LETAGROP, taking into account hydrolysis of the nickel(II) cation and the acid/base reactions of the ligands whose equilibrium constants were kept fixed during the analysis. In the study of the binary nickel(II)–amino acids systems the species [NiL]+, NiL2 and [NiL3]− were observed, and in the case of the ternary nickel(II)–dipicolinic acid–amino acids systems the complexes Ni(Dipic)HL, [Ni(Dipic)L]− and [Ni(Dipic)L(OH)]2− were observed. The respective stability constants were determined, and the species distribution diagrams, as a function of pH, are briefly discussed.
10 citations
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TL;DR: In this paper, the formation constants of the resulting mixed ligand complexes have been determined at 25 °C and ionic strength 1.0 millimol·dm−3 NaCl.
Abstract: Solution equilibria in the binary systems of Ni(II)–amino acid {aspartic acid (H2asp), glutamic acid (H2glu), cysteine (H2cys) and histidine (Hhis)} and in the ternary systems of Ni(II)–dipicolinic acid (H2dipic)–amino acid {aspartic acid (H2asp), glutamic acid (H2glu), cysteine (H2cys) and histidine (Hhis)} have been studied pH-potentiometrically. The formation constants of the resulting mixed ligand complexes have been determined at 25 °C and ionic strength 1.0 mol·dm−3 NaCl. In the Ni(II)–H2asp system the data indicated the formation of the [NiHL]+, NiL and [NiL2]2− complexes. For the Ni(II)–H2glu system, the formation of the species NiL and [NiL2]2− are indicated. In the Ni(II)–H2cys system the complexes [NiHL]+, NiL and [NiHL2]− were detected, while in the Ni(II)–Hhis system the species [NiH2L]3+ [NiHL]2+, NiL+, [Ni(HL)2]2+, [NiHL2]+ and NiL2 were detected. In the ternary system Ni(II)–H2dipic–H2asp, the species Ni(dipic)(H2L), [Ni(dipic)(HL)]−, [Ni(dipic)(L)]2− and [Ni(dipic)(L)(OH)]3− were detected. In the Ni(II)–H2dipic–H2glu system, the species Ni(dipic)(H2L), [Ni(dipic)(HL)]−, [Ni(dipic)(L)]2− and [Ni(dipic)(L)(OH)]3− were detected. In the Ni(II)–H2dipic–H2cys system, the species Ni(dipic)(H2L), [Ni(dipic)(HL)]− and [Ni(dipic)(L)]2− were detected. Finally, in the Ni(II)–H2dipic–Hhis system, the species [Ni(dipic)(L)]− and [Ni(dipic)(L)(OH)]2− were detected. Species distribution diagrams as a function of pH are briefly discussed.
9 citations
Cited by
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TL;DR: A bibliographical research emphaticizing the chemical speciation of the vanadium with different amino acids and reviewing also some other important aspects such as its chemistry and therapeutical applications of several vanadium complexes.
76 citations
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TL;DR: Analysis of the equilibrium constants of the reactions and spectroscopic data has allowed determination of the type of coordination and effectiveness of the carboxyl groups in the process of complex formation.
60 citations
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TL;DR: A series of mixed ligand complexes were prepared from the Schiff base (L 1 ) as a primary ligand, prepared by condensation of oxamide and furan-2-carbaldehyde, and 1,10-phenanthroline (1, 10-phen) as a secondary ligand as mentioned in this paper.
50 citations
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TL;DR: It was shown that VC-IV could provide adequate protection against CP-induced hepatotoxicity and genotoxicity in vivo, and this study aimed to investigate the protective role of an organovanadium complex, viz., oxovanadium(IV)-L-cysteine methyl ester against cyclophosphamide (CP).
33 citations
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TL;DR: Third-order NLO properties of nitrogen containing phenanthroline based compound 9 were observed to be several times higher than those of the compounds 7 and 8, justify the design approach.
26 citations