Synthesis and characterization of silver(I) complex with mixed ligands saccharinate and 2-(2-pyridyl)bezimidazole / Síntesis y caracterización del complejo de plata(I) con ligandos mixtos sacarinato y 2-(2-piridil)bezimidazol / Síntese e caracterização do complexo de prata(I) com ligandos mistos sacarinato e 2-(2-piridil)benzimidazol

Abstract A new silver coordination compound [Ag(sac) (pbi)] was synthesized by reaction of silver(I) saccharinate with 2-(2-pyridyl)benzimidazole (pbi) in 64% yield. The characterization was performed by elemental analysis, IR, UV-Visible, XPS, 1H-NMR, and 13C-NMR spectroscopy. According to the results, silver is coordinating through three nitrogen atoms: one from saccharinate and the others from 2-(2-pyridyl) benzimidazole forming with this ligand a five-membered chelate ring.

Resumen Se sintetizó un nuevo compuesto de coordinación de plata, [Ag(sac)(pbi)], por reacción de sacarinato de plata(I) con 2-(2-piridil)bencimidazol (pbi) con un rendimiento de 64%. La caracterización se realizó por análisis elemental, espectroscopia IR, UV-Visible, XPS, 1H-RMN y 13C-RMN. De acuerdo con los resultados obtenidos la plata está coordinada a través de tres átomos de nitrógeno, uno del sacarinato y los dos restantes del 2-(2-piridil)-bencimidazol formando con este ligando un anillo quelato de cinco miembros.

Resumo O presente trabalho compreende a síntese de um novo composto de coordenação de prata, [Ag(sac)(pbi)], por reação de sacarinato de prata(I) com 2-(2-piridil)benzimidazol (pbi) com 64% de rendimento. A caracterização foi realizada por análise elementar, espectroscopia IV, UV-Visível, XPS, 1H-RMN e 13C-RMN. De acordo com os resultados obtidos, a prata é coordenada através de três átomos de nitrogênio, um do sacarinato e os outros dois do 2-(2-piridil)benzimidazol que formam com este ligando um anel de quelato de cinco membros.

Análisis espectroscópico y morfológico de una válvula artificial para el corazón / Spectroscopic and morphologic analisis of an artificial cardiac valve

RESUMEN Los materiales que están en contacto con el sistema corporal requieren de la característica primordial que les permita su aceptación e integración en el organismo: la biocompatibilidad. De igual manera, deben exhibir excelentes propiedades mecánicas, tribológicas y topográficas para que su prestación del servicio en el tejido especificado sea el más óptimo, pudiendo esbozar estas características mediante la caracterización de estos materiales a través de técnicas espectroscópicas y microscópicas. En el presente trabajo, una válvula artificial para el corazón fabricada en titanio y recubierta con diamond-like carbon (DLC), material altamente biocompatible, fue sometida a análisis XPS, FTIR y morfológico. En estos se encontró una alta interdifusión del recubrimiento con el sustrato junto con una gran señal de enlaces sp3. Los enlaces terminales CH3 suponen una película poco compacta. La rugosidad del recubrimiento fue baja y adecuada para fines hemocompatibles.

ABSTRACT The materials that are in contact with the body system require the fundamental characteristic that allows their acceptance and integration in the organism, the biocompatibility. Likewise, they must show excellent mechanical, tribological and morphological properties, so that their provision of a service in the specific tissue is the most optimal, being able to sketch such characteristics through the characterization of these materials by spectroscopic and microscopic techniques. In this work, an artificial valve for the heart made of titanium and coated with diamond-like carbon (DLC), highly biocompatible material, was subjected to XPS, FTIR, and morphological analysis. A high interdiffusion of the coating and the substrate was found, together with a large signal of sp3 bonds. The CH3 terminal bonds represent a little compact film. The film roughness of the coating was low and adequate for hemocompatible purposes.

Physicochemical and Biological Investigation of Different Structures of Carbon Coatings Deposited onto Polyurethane

The aim of this study was to examine the thrombogenic properties of polyurethane that was surface modified with carbon coatings. Physicochemical properties of manufactured coatings were investigated using transmission electron microscopy (TEM), atomic force microscopy (AFM), X-ray Photoelectron Spectroscopy (XPS), Raman spectroscopy and contact angle measurement methods. Samples were examined by the Impact-R method evaluating the level of platelets activation and adhesion of particular blood cell elements. The analysis of antimicrobial resistance against E. coli colonization and viability of endothelial cells showed that polyurethane modified with use of carbon layers constituted an interesting solution for biomedical application.

Análisis químico y topográfico de la superfície de implantes dentarios mediante espectroscopia de fotoelectrones y microscopía electrónica de barrido: estudio preliminar / Chemical and topographic analysis of dental implant surfaces using photoelectron spectroscopy and scanning electron microscopy: preliminary study

El objetivo de este estudio fue analizar la composición química y la topografía superficial de implantes de titanio comercialmente puro, obtenidos de 3 marcas comerciales utilizadas actualmente en odontología. Fueron analizados 6 implantes de titanio de los siguientes sistemas: SIN, P-I philosophy y Neodent. Este material fue dividido en 3 grupos de 3 implantes cada uno. Para determinar la composición química de la superficie fue utilizada la técnica de Espectroscopia de Fotoelectrones Excitada por rayos-X (XPS), mientras que para caracterizar la topografía superficial fue utilizada Microscopia electrónica de barrido. Titanio, Carbono Silicio y Oxigeno fueron identificados en todas las muestras analizadas. Otros elementos contaminantes identificados fueron Silicio, Aluminio, azufre, plomo, Fósforo, Calcio, Sodio, Nitrógeno y Carbono. Fueron identificadas impurezas en la superficie de todos los implantes analizados. Consideramos necesarios otros estudios que relacionen permanentemente la presencia y concentración de estos elementos con el proceso de oseointegración...

The aim of this study was to analyze the chemical composition and surface topography of commercially pure titanium implants, obtained from 03 trademarks frequently used in dentistry. There were 9 titanium implants of the following systems: SIN, P-I philosophy and Neodent. These materials were divided into 3 groups, with 3 implants in each group. Photoelectron Spectroscopy Excited by X-ray (XPS) was used to determine the chemical composition, while to characterize the surface topography we used Scanning Electron Microscopy (SEM). Titanium, carbon silicon and oxygen were identified in all samples analyzed. Other contaminants were: silicon, aluminum, sulfur, lead, phosphorus, calcium, sodium, nitrogen and carbon. We identified impurities on the surface of all implants analyzed. We consider necessary to development more studies relating the presence and concentration of these elements with the osseointegration process...

The Treatment of Gynecomastia using XPS(R) Microresector (Shaver)

PURPOSE: Gynecomastia is an abnormal increase in the volume of the male breast. Subcutaneous mastectomy was the first surgical treatment for gynecomastia. But because of the complications such as nerve injury and scar formation, subcutaneous mastectomy has been substituted with liposuction. Recently various techniques including ultrasound-assisted liposuction has been used for treatment of gynecomastia. The purpose of this study is to evaluate the results of XPS(R) microresector (Shaver) for treatment of gynecomastia. METHODS: 17 patients, 33 breasts of gynecomastia, Simon grade I or II have been treated with XPS(R) microresector (Shaver). The mean age was 24.5. The subcutaneous tissue and glandular tissue were removed with XPS(R) microresector (Shaver). The operation time, the weight of removed tissue and patients' satisfaction score were accessed. RESULTS: The mean operation time was 78.2 minutes. The mean weight of removed tissue was 113.8 g. There were no significant complications such as necrosis, hematoma, infection or scar contracture. Patients' satisfactory score of scar, shape and confidence were 8.4, 8.2 and 8.4 respectively. As the average score was 8.3, most of the patients were satisfied with their breasts. CONCLUSION: The authors have treated 17 patients suffering from gynecomastia with XPS(R) microresector (Shaver). We obtained short operation time, early recovery, minimal operative scar and less complications with XPS(R) microresector (Shaver) for the treatment of gynecomastia, and patients were satisfied with the results of our method. We concluded that XPS(R) microresector (Shaver) is an alternative option for the treatment of gynecomastia.

Caracterização e torque de remoção de implantes dentários com superfície bioativa / Dental implant with bioactive surface

Apesar das empresas fabricantes dos implantes osseointegrados empregarem as mesmas ligas de titânio, existe diferença no desempenho entre os implantes comerciais. Este comportamento é associado aos procedimentos adotados durante a fabricação dos implantes, principalmente no tratamento da superfície. No presente trabalho, fez-se a comparação da rugosidade, molhabilidade, morfologia da superfície e torque de remoção da tíbia de coelhos de implantes de Ti usinados, tratados com ácido, tratados com flúor e anodizados. Os resultados obtidos mostraram que: i) o tratamento da superfície aumenta significativamente o torque de remoção; ii) não há diferença significativa entre a rugosidade dos implantes tratados; iii) após a anodização, há aumento na propriedade hidrofílica do implante e, iv) após o tratamento da superfície, os implantes apresentam óxidos com diferentes composições químicas e estruturas cristalinas.

XPS(R) Microresector for Treatment of Axillary

PURPOSE: Surgical excision of the subcutaneous tissues, with or without skin excision in the axillary hair-bearing area, has been the treatment of choice in treating osmidrosis for several decades. However, long periods of postoperative immobilization of a shoulder joint, partial necrosis of skin flaps or the possibility of hematoma and scars have occurred frequently. So we used XPS(R) microresector(Shaver) in procedure which requires removal of soft tissue for comparing results between surgical excision and the laters. METHODS: From January 2007 to February 2008, a total of 20 patients(8 male and 12 female) underwent XPS(R) microresector(Shaver) assisted aspiration for treating osmidrosis. The mean age of the subjects was 21.9, and we tried to analyze some advantages of XPS(R) microresector(Shaver). RESULTS: The average operation time was 61.6 minutes. This results can show that the patients who received XPS(R) microresector(Shaver) assisted aspiration can accomplish better outcomes than any other procedures in terms of operation time at least. Moreover, no significant postoperative complications occurred in our studies. Subjects have been followed up from 2 months to 1 year and among these patients, no one suffered from critical complications. CONCLUSION: In brief, XPS(R) microresector(Shaver) is able to shorten the time of operation and simplify the procedures relatively and this device has more superiorities in wound healing by maintaining of vascularized dermal skin flaps. It means that XPS(R) microresector (Shaver) can prevent flap necrosis, axillary hair loss and minimalize scarring and bleeding. Thus, we expect that these advantages can lead to better patient's comfort and self-confidence than several previous procedures.