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Fluorescence Quenching of Tyrosine-Ag Nanoclusters by Metal Ions: Analytical and Physicochemical Assessment. Int J Mol Sci 2022; 23:ijms23179775. [PMID: 36077173 PMCID: PMC9456322 DOI: 10.3390/ijms23179775] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 08/20/2022] [Accepted: 08/26/2022] [Indexed: 11/05/2022] Open
Abstract
A new synthesis method is described for the first time to produce silver nanoclusters (AgNCs) by using the tyrosine (Tyr) amino acid. Several important parameters (e.g., molar ratios, initial pH, reaction time etc.) were optimized to reach the highest yield. The formed Tyr-AgNCs show characteristic blue emission at λem = 410 nm, and two dominant fluorescence lifetime components were deconvoluted (τ1 ~ 3.7 and τ2 ~ 4.9 ns). The NCs contained metallic cores stabilized by dityrosine. For possible application, the interactions with several metal ions from the tap water and wastewater were investigated. Among the studied cations, four different ions (Cu2+, Ni2+, Fe3+, and Rh3+) had a dominant effect on the fluorescence of NCs. Based on the detected quenching processes, the limit of detection of the metal ions was determined. Static quenching (formation of a non-luminescent complex) was observed in all cases by temperature-dependent measurements. The calculated thermodynamic parameters showed that the interactions are spontaneous ranked in the following order of strength: Cu2+ > Fe3+ > Rh3+ > Ni2+. Based on the sign and relations of the standard enthalpy (ΔH°) and entropy changes (ΔS°), the dominant forces were also identified.
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Naso LG, Martínez Medina JJ, D'Alessandro F, Rey M, Rizzi A, Piro OE, Echeverría GA, Ferrer EG, Williams PAM. Ternary copper(II) complex of 5-hydroxytryptophan and 1,10-phenanthroline with several pharmacological properties and an adequate safety profile. J Inorg Biochem 2019; 204:110933. [PMID: 31825796 DOI: 10.1016/j.jinorgbio.2019.110933] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 11/12/2019] [Accepted: 11/17/2019] [Indexed: 12/22/2022]
Abstract
We report the synthesis and biological evaluation of a ternary copper complex, [Cu(5HTP)(phen)(H2O)](NO3).2H2O, with the antioxidant agent 5-hydroxytryptophan (5-HTP) and phenanthroline (phen, added to improve its lipophilicity and membrane transport). The crystal structure of the complex was determined by X-ray diffraction methods. The complex showed antioxidant, antimicrobial, antitumor and antimetastatic properties with an adequate safety profile. The interaction of the metal with phen promotes cellular copper accumulation and cytotoxicity on human lung A549 cell line (IC50 = 3.6 μM). Furthermore, the viability of the normal human fetal lung fibroblast cell line (MRC-5) is not altered by the complex. An oxidative stress mechanism for the anticancer effect has been determined: cellular increase of reactive oxygen species (ROS), decrease of the glutathione (GSH) and oxidized GSH (GSSG) ratio and alteration of the mitochondrial potential. The complex also displays antimetastatic activities with inhibition of cell adhesion, invasion and migration. It has not mutagenic behavior and no toxicity on Artemia salina indicating its potential to act as an effective and safety antimicrobial and antitumor drug.
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Affiliation(s)
- Luciana G Naso
- CEQUINOR, CONICET/UNLP, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Bv. 120 N° 1465, 1900 La Plata, Argentina.
| | - Juan J Martínez Medina
- Universidad Nacional del Chaco Austral, Comandante Fernández 755, CP: 3700 Presidencia Roque Sáenz Peña, Chaco, Argentina
| | - Franco D'Alessandro
- CEQUINOR, CONICET/UNLP, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Bv. 120 N° 1465, 1900 La Plata, Argentina
| | - Marilin Rey
- Departamento de Física, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, Ciudad Universitaria-Paraje El Pozo, 3000 Santa Fe, Argentina
| | - Alberto Rizzi
- Departamento de Física, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, Ciudad Universitaria-Paraje El Pozo, 3000 Santa Fe, Argentina
| | - Oscar E Piro
- Departamento de Física, Facultad de Ciencias Exactas, Universidad Nacional de La Plata y IFLP (CONICET, CCT La Plata), C.C. 67, 1900 La Plata, Argentina
| | - Gustavo A Echeverría
- Departamento de Física, Facultad de Ciencias Exactas, Universidad Nacional de La Plata y IFLP (CONICET, CCT La Plata), C.C. 67, 1900 La Plata, Argentina
| | - Evelina G Ferrer
- CEQUINOR, CONICET/UNLP, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Bv. 120 N° 1465, 1900 La Plata, Argentina
| | - Patricia A M Williams
- CEQUINOR, CONICET/UNLP, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Bv. 120 N° 1465, 1900 La Plata, Argentina.
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