European Journal of Chemistry 2012, 3(4), 411-415. doi:10.5155/eurjchem.3.4.411-415.482

Spectrophotometric investigation of DL-tryptophan in the presence of Ni(II) or Co(II) ions


Ozlen Altun (1,*) , Selin Bilcen (2)

(1) Department of Chemistry, Faculty of Sciences and Letters, Trakya University, Edirne, TR-22030, Turkey
(2) Department of Chemistry, Faculty of Sciences and Letters, Trakya University, Edirne, TR-22030, Turkey
(*) Corresponding Author

Received: 04 Jul 2011, Accepted: 05 Dec 2012, Published: 31 Dec 2012

Abstract


In the present study, synthesis of transition metal complexes of DL-tryptophan with metal precursors such as nickel (II) and cobalt (II) ions in water under refluxing conditions and optimization of the reactions to obtain the composition of complexes in water solutions has been reported. The preparation and structural elucidation of the complexes was undertaken by using physico-chemical, potentiometric titration and spectroscopic methods (UV/Vis, FT-IR and XRD). Comparisons of the spectral measurements of DL-tryptophan with those of the nickel (II) and cobalt (II) complexes are useful in determining the atoms of the ligand that are coordinated to the metal ion. In addition, K (dissociation constant) and ΔG (Gibbs free energy) values were calculated using the Babko and Stanley & Turners methods. Antibacterial and antifungal activities of the complexes were studied screened against bacteria and fungi. The activity data shows that and cobalt complexes of DL-tryptophan are more potent than the DL-tryptophan.

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Keywords


DL-Tryptophan; Biological activity; Gibbs free energy; Spectrophotometry; Dissociation constant; Potentiometric titration

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DOI: 10.5155/eurjchem.3.4.411-415.482

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Citations

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[1]. Anatoly Safronikhin, Heinrich Ehrlich, Georgy Lisichkin
LaF3 nanoparticles surface modified with tryptophan and their optical properties
Applied Surface Science  317, 480, 2014
DOI: 10.1016/j.apsusc.2014.08.130
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[2]. Man Qiao, Junze Jiang, Jidong Yang, Shaopu Liu, Zhongfang Liu, Xiaoli Hu
A sensitive “turn-on” fluorescent assay for quantification of ceftriaxone based on l-tryptophan-Pd(II) complex fluorophore
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy  161, 95, 2016
DOI: 10.1016/j.saa.2016.02.021
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How to cite


Altun, O.; Bilcen, S. Eur. J. Chem. 2012, 3(4), 411-415. doi:10.5155/eurjchem.3.4.411-415.482
Altun, O.; Bilcen, S. Spectrophotometric investigation of DL-tryptophan in the presence of Ni(II) or Co(II) ions. Eur. J. Chem. 2012, 3(4), 411-415. doi:10.5155/eurjchem.3.4.411-415.482
Altun, O., & Bilcen, S. (2012). Spectrophotometric investigation of DL-tryptophan in the presence of Ni(II) or Co(II) ions. European Journal of Chemistry, 3(4), 411-415. doi:10.5155/eurjchem.3.4.411-415.482
Altun, Ozlen, & Selin Bilcen. "Spectrophotometric investigation of DL-tryptophan in the presence of Ni(II) or Co(II) ions." European Journal of Chemistry [Online], 3.4 (2012): 411-415. Web. 21 Oct. 2019
Altun, Ozlen, AND Bilcen, Selin. "Spectrophotometric investigation of DL-tryptophan in the presence of Ni(II) or Co(II) ions" European Journal of Chemistry [Online], Volume 3 Number 4 (31 December 2012)

DOI Link: https://doi.org/10.5155/eurjchem.3.4.411-415.482

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