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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Studying the interaction between trinuclear ruthenium complexes and human serum albumin by means of fluorescence quenching

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Cacita, Natacha [1] ; Nikolaou, Sofia [1]
Total Authors: 2
[1] Univ Sao Paulo, Fac Filosofia Ciencias & Letras Ribeirao Preto, Dept Quim, BR-14040901 Ribeirao Preto, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Journal of Luminescence; v. 169, n. A, p. 115-120, JAN 2016.
Web of Science Citations: 22

This work reports for the first time a systematic investigation of the interaction between HSA and trinuclear ruthenium complexes, by using fluorescence spectroscopy and the Stern-Volmer model. The compounds investigated have general formula {[}Ru3O(CH3COO)(6)(3-pic)(2)(L)]PF6, where L=NO or H2O and 3-pic=3-methylpyridine. For both complexes it was observed that the increase of K-SV, values (in the order of 10(4) M-1) with increasing temperature, signaling a dynamic quenching of HSA fluorescence. However, analysis of the quenching rate constants and K-b values shows that the contribution of the static quenching is significant. Particularly in the case of the nitrosyl complex, the relatively high value of K-b observed (178.44 x 10(3) M-1, 308 K) suggests that this compound can be efficiently stored and transported in the body by HSA. The interaction of the complexes with HSA is spontaneous (Delta G < 0). Complex {[}Ru3O(CH3COO)(6)(3-pic)(2)(L)]PF6 displays interaction with HSA by hydrophobic forces (Delta H=215 kJ mol(-1) and Delta S=796 J mol(-1) K-1), likely because of the nitrosyl lipophilicity, while complex Ru3O(CH3COO)(6)(3-pic)(2)(L)]PF6 is involved in the formation of hydrogen bonds with HSA (Delta H= -75.5 kJ mol(-1) and AS = -231 J mol(-1) K-1), through its aquo ligand. (C) 2015 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 12/23245-6 - Nitric oxide releasers based on ruthenium carboxylates and their interaction with some relevant biomolecules
Grantee:Sofia Nikolaou
Support Opportunities: Regular Research Grants