Partial inclusion of bis(1,10-phenanthroline)silver(I) salicylate in ß-cyclodextrin: Spectroscopic characterization, in vitro and in silico antimicrobial evaluation.

Silver complexes containing 1,10-phenanthroline as a coordinated ligand have been of great interest due to their antibacterial and antifungal pharmacological properties. In this paper, we describe the synthesis of a new partial inclusion complex of bis(1,10-phenanthroline)silver(I) salicylate in ß-cyclodextrin (ß-CD) which was synthesized with a good yield. The compounds were characterized by FTIR, 1H, 13C NMR including 1H-1H COSY, TGA/DSC, elemental analysis (CHN), and X-ray powder diffraction. The results suggest the presence of non-covalent interactions such as hydrogen bonds, van der Waals forces, and hydrophobic interactions in the formation of the partial inclusion compound between ß-CD and bis(1,10-phenanthroline)silver(I) salicylate [Ag(phen)2]salH. Additionally, an in silico prediction of 1,10-phenanthroline biological activities was carried out and the acquired data suggests several potential targets associated with the antimicrobial activity of this compound and its silver complex. Most predicted targets are related to antimicrobial virulence and resistance that are a serious threat to global public health. The inclusion compound showed a higher inhibiting growth of Candida albicans than the free complex [Ag(phen)2]salH indicating that the formation of the inclusion complex with ß-CD increases the bioavailability of the antimicrobial active species [Ag(phen)2]+ of the new silver(I) compound.

Self-assembled organic-inorganic magnetic hybrid adsorbent ferrite based on cyclodextrin nanoparticles.

Organic-inorganic magnetic hybrid materials (MHMs) combine a nonmagnetic and a magnetic component by means of electrostatic interactions or covalent bonds, and notable features can be achieved. Herein, we describe an application of a self-assembled material based on ferrite associated with ß-cyclodextrin (Fe-Ni/Zn/ßCD) at the nanoscale level. This MHM and pure ferrite (Fe-Ni/Zn) were used as an adsorbent system for Cr(3+) and Cr(2)O(7) (2-) ions in aqueous solutions. Prior to the adsorption studies, both ferrites were characterized in order to determine the particle size distribution, morphology and available binding sites on the surface of the materials. Microscopy analysis demonstrated that both ferrites present two different size domains, at the micro- and nanoscale level, with the latter being able to self-assemble into larger particles. Fe-Ni/Zn/ßCD presented smaller particles and a more homogeneous particle size distribution. Higher porosity for this MHM compared to Fe-Ni/Zn was observed by Brunauer-Emmett-Teller isotherms and positron-annihilation-lifetime spectroscopy. Based on the pKa values, potentiometric titrations demonstrated the presence of ßCD in the inorganic matrix, indicating that the lamellar structures verified by transmission electronic microscopy can be associated with ßCD assembled structures. Colloidal stability was inferred as a function of time at different pH values, indicating the sedimentation rate as a function of pH. Zeta potential measurements identified an amphoteric behavior for the Fe-Ni/Zn/ßCD, suggesting its better capability to remove ions (cations and anions) from aqueous solutions compared to that of Fe-Ni/Zn.

EVALUACIÓN DE LA ACTIVIDAD CITOTÓXICA Y ANTIMICROBIANA DEL COMPUESTO [Ag(phen)2]salH) / EVALUATION OF THE CITOTOXICITY AND ANTIMICROBIAL ACTIVITY OF THE [Ag(phen)2]salH COMPOUND / AVALIAÇÂO DA ACTIVIDADE CITOTÓXICA E ANTIMICROBIANA DO COMPOSTO [Ag(phen)2]salH

En este artículo se evaluó la actividad antimicrobiana y citotóxica de un nuevo complejo de plata(I) con el ión salicilato y 1,10-fenantrolina. La caracterización de este compuesto se realizó por espectroscopia de resonancia magnética nuclear de protón y carbono-13 (RMN ¹H y 13C), espectroscopia de absorción en la región de infrarrojo (IR), análisis térmico (TG/DSC) y análisis elemental (CHN). Los resultados obtenidos a través de estos métodos sugieren la formación del compuesto con fórmula empírica [Ag(phen)2] salH. Cuando fue comparada la actividad antimicrobiana y citotóxica de este complejo con otros compuestos de plata(I) y cobre(II) de actividad conocida, se observó que el ligante 1,10-fenantrolina incrementa estas propiedades. El compuesto en estudio, presenta la mayor inhibición del crecimiento bacteriano, los microorganismos Gram positivos fueron los más susceptibles. La actividad citotóxica fue evaluada en un panel de cinco líneas celulares tumorales humanas: MDA-MB231, PC-3, HT-29, HEp-2 y A549. A las concentraciones evaluadas, el compuesto produjo una respuesta citotóxica dosis-dependiente en todas las líneas celulares tumorales, particularmente para las líneas tumorales HT-29, MDA-MB231 y A549. Todo esto, sugiere su gran potencial para usos quimioterapéuticos.

This article evaluated the antimicrobial and cytotoxic activity of a new complex of silver(I) with the salicylate ion and 1,10-phenanthroline. The characteriza-tion of this compounds was performed by nuclear magnetic resonance spectroscopy of proton and carbon-13 (RMN ¹H y 13C), spectroscopy absorption in the infrared (IR), thermal analysis (TG/DCS) and elemental analysis (CHN). The results ob-tained through these methods suggest the formation of the compound with empiri-cal formula Ag(phen)2]salH 4. When was compared the antimicrobial activity and cytotoxicity of the complex with other compounds of silver(I) and copper(II) of known activity, we observed that 1, 10-phenalthroline ligand increases these properties. The compound under study has the highest inhibition of bacterial growth, Gram-positive microorganisms were the most susceptible. The cytotoxic activity was tested against a panel of fve human cancer cell lines: MDA-MB231, PC-3, HT-29, HEp-2 and A549. At the concentrations tested, the compound pro-duced a dose-dependent cytotoxic res-ponse against all tumor cell lines, parti-cularly against the HT-29, MDA-MB231 and A549 cell lines. All this suggests its potential chemotherapeutic use.

Neste artigo avaliou-se a atividade antimicrobiana e citotóxica de um novo complexo de prata(I) com o íon sali-cilato e 1,10-fenantrolina. A caracterização deste composto foi realizada por espectroscopia de ressonância magnética nuclear de próton e carbono-13 (RMN ¹H e 13C), espectroscopia de absorção na região de infravermelho (IV), análise térmico (TG/DSC), análi-se elementar (CHN). Os resultados ob-tidos através destes métodos sugerem a formação do composto com fórmula empírica [Ag(phen)2]salH. Quando foi comparada a atividade antimicrobiana e citotóxica deste complexo com outros compostos de prata(I) e cobre(II) de ati-vidade conhecida, observou-se que o ligante 1,10-fenantrolina aumenta essas propriedades. O composto em estudo apresenta maior inibição do crescimento bacteriano, os microorganismos Gram-positivos foram os mais suscetíveis. A atividade citotóxica foi avaliada em um painel de cinco linhas de células tu-morais humanas: MDA-MB231, PC-3, HT-29, HEp-2 e A549. Com as concen-trações avaliadas, o composto deu uma resposta citotóxica dose-dependência em todas as linhagens de células tumo-rais, particularmente para as linhas de células tumorais HT-29, MDA-MB231 e A549. Tudo isso, sugere, um grande potencial para aplicações em quimioterapia.

Preparación y crracterización de compuestos de sociación entre el acetato, proopionato y butirato de rodio(ii) con ß-ciclodextrina / Preparation ad ccharacterizaton of compounds of association between rhodium((ii) carboxylates (acetate, propionate and butyrate) and ß-cyclodextrln / Preparaçãoe caraacterização de compostos de associação ente o acetato, prropionato e butirato de ródio(ii) com ß-ciclodextrina

En el presente trabajo se describe la preparación y caracterización del acetato, propionato y butirato de rodio(II), y sus respectivos compuestos de inclusión y/o asociación con ß-ciclodextrina (ßCD). Estos complejos fueron caracterizados por análisis elemental (CHN), espectroscopia de absorción en la región de infrarrojo (IR), análisis térmico (TG/DTG/ DSC), difracción de rayos X en polvo (DRX), espectroscopia de resonancia magnética nuclear de protón y de carbo-no-13 (RMN ¹H, 13C). Además, se realizaron experimentos para la determinación de tiempos de relajación longitudinal (T1 lH) en Cross Polarization Magic Angle Spinning (CP/MAS). Los resultados encontrados a través de estos métodos indican la formación de compuestos de asociación y/o inclusión parcial entre los carboxilatos de rodio(II) acetato, propio-nato y butirato con ß-ciclodextrina.

This article describes the preparation and characterization of rhodium (II) acetate, propionate and butyrate, and their inclusion and/or association compounds with ß-cyclodextrin (ßCD). The characterization of the compounds in this study was performed by elemental analysis (CHN), FTIR spectroscopy, thermal analysis (TG/DTG/DSC), XRD powder pattern diffraction, ¹Hand 13C nuclear magnetic resonance in solution 13C, and 31PCP/ MAS NMR in solid state. Besides, experiments for the determination oflongitudinal T1 relaxation times were also used. The results indicated the formation of inclusion or association compounds between rhodium (II) carboxylates (acetate, propionate or butyrate) and ß-cyclodextryn.

Neste artigo descreve-se a preparação e caracterização de acetato, propionato e butirato de ródio(II), seus respectivos compostos de inclusão ou associação com ß-ciclodextrina (ßCD). Estes compostos de estudo foram caraterizados por análise elementar (CHN), espectroscopia de absorção na região de infravermelho (IV), análise térmica (TG/DTG/DSC), difração de raios-X em pó (DRX), espectrome-tria de ressonância magnética nuclear de próton e de carbono-13. Além disso, se conduziram experimentos para a determinação de tempos de relaxação longitudinal (Tj ¹H) em solução e de espectros no estado sólido de 13C CP-MAS, "Cross Polarization Magic Angle Spinning". Os resultados encontrados através desses métodos indicaram a formação de compostos de associação ou inclusão parcial entre os carboxilatos de ródio(II) acetato, propionato e butirato com a ß-ciclodex-trina.