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1.
Braz. J. Pharm. Sci. (Online) ; 59: e22320, 2023. tab, graf
Article in English | LILACS | ID: biblio-1439541

ABSTRACT

Abstract Flaxseed (Linum usitatissimum L.) is the seed of a multipurpose plant of pharmaceutical interest, as its mucilage can be used as a natural matrix to develop extended-release dosage forms and potentially replace synthetic polymers. In this study, a 3² factorial design with two replicates of the central point was applied to optimize the development of extended-release granules of metformin HCl. The total fiber content of the mucilage as well as the friability and dissolution of the formulations were evaluated. The lyophilized mucilage presented a high total fiber content (42.63%), which suggests a high efficiency extraction process. Higher concentrations of the mucilage and metformin HCl yielded less friable granules. In addition, lower concentrations of metformin HCl and higher concentrations of the mucilage resulted in slower drug release during the dissolution assays. The release kinetics for most formulations were better represented by the Hixson-Crowell model, while formulations containing a higher concentration of the mucilage were represented by the Korsmeyer-Peppas model. Nonetheless, five formulations showed a longer release than the reference HPMC formulation. More desirable results were obtained with a higher concentration of the mucilage (13-18%) and a lower concentration of metformin (40%).


Subject(s)
Flax/classification , Plant Mucilage/agonists , Metformin/analysis , Plants/adverse effects , Polymers/adverse effects , Pharmaceutical Preparations/analysis
2.
Int. braz. j. urol ; 44(4): 831-834, July-Aug. 2018. graf
Article in English | LILACS | ID: biblio-954063

ABSTRACT

ABSTRACT Context: Polyacrylate-polyalcohol copolymer is a synthetic product, non-biodegradable, with low rate of therapeutic failure and lower incidence of reactions at the site of injection, when compared to biodegradable agents. We report an unprecedent, exuberant and persistent inflammatory reaction following injection of that substance. Patient: a 17 years-old patient with vesico-ureteral reflux and complete pyelocaliceal right duplication was submitted to treatment with polyacrylate-polyalcohol copolymer (STING technique). In the seventh day of post-operatory, she presented intense dysuria and hypogastric pain, without laboratory exams alterations; a symptomatic treatment was started. After two months, the symptoms persisted and an ultrasound detected thickening of bladder wall close to the uretero-vesical junction. After that exam, a cystostopic biopsy showed epithelial hyperplasia with increased edema of lamina propria, suggesting an adverse reaction to the polymer. After four months, there was complete remission, but the reflux persisted with the same grade. Hypothesis: This is an unprecedent reaction following injection of this copolymer. The presence of characteristics such as absence of infection, temporal relation between treatment and beginning of symptoms, and detection of epithelial hyperplasia at the local of injection reinforce the hypothesis of association of the substance and adverse reaction. In that patient, important complains motivated early investigation of urinary tract, that confirmed those aspects. Maybe if that reaction had occurred in patients with lower capacity of expression (such as in infants) it would be unnoticed.


Subject(s)
Humans , Female , Adolescent , Polymers/adverse effects , Vesico-Ureteral Reflux , Biocompatible Materials/adverse effects , Acrylates/adverse effects , Foreign-Body Reaction/chemically induced , Foreign-Body Reaction/pathology , Vesico-Ureteral Reflux/pathology , Biopsy , Foreign-Body Reaction/diagnostic imaging , Ultrasonography , Treatment Outcome , Cystoscopy , Injections
3.
Braz. j. pharm. sci ; 52(4): 635-643, Oct.-Dec. 2016. graf
Article in English | LILACS | ID: biblio-951891

ABSTRACT

ABSTRACT Polymeric films associating different concentrations of Eudragit(r) FS 30 D (EFS) and chondroitin sulfate (CS) were produced by casting for the development of a new target-specific site material. Formed films kept a final polymer mass of 4% (w/v) in the following proportions: EFS 100:00 CS (control), EFS 95:05 CS, EFS 90:10 CS and EFS 80:20 CS. They were analyzed for physical and chemical characteristics using Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and Raman spectroscopy. Furthermore, they were characterized by their water vapor permeability and degree of hydration at different conditions simulating the gastrointestinal tract. No chemical interactions were observed between CS and EFS, suggesting only a physical interaction between them in the different combinations tested. The results suggest that EFS and CS, when combined, may form films that are candidates for coating processes seeking a modified drug delivery, especially due to the synergism between pH dependency and specific biodegradability properties by the colonic microbiota. EFS 90:10 CS proved to be the most suitable for this purpose considering hydration and permeability characteristics of different associations analyzed.


Subject(s)
Polymers/adverse effects , Chondroitin Sulfates/analysis , /classification , Spectrum Analysis, Raman/instrumentation , Microscopy, Electron, Scanning/instrumentation , Administration, Oral , Spectroscopy, Fourier Transform Infrared/instrumentation , Drug Liberation
4.
São Paulo; s.n; 2016. 109 p. ilus, tab. (BR).
Thesis in Portuguese | LILACS, BBO | ID: biblio-867995

ABSTRACT

As próteses faciais e intraorais tem um importante papel na devolução da estética e de algumas funções para os pacientes. Por meio da restauração da imagem corporal é possível reintegrá-lo a sociedade, resgatando assim a identidade do indivíduo. A boa condição dessas próteses é primordial para que estas possam exercer suas funções adequadamente e manter o local, onde estão inseridas, livre de infecções e inflamações. Portanto, a não formação de colônias e biofilmes bacterianos em materiais eleitos para confecção dessas próteses, trarão benefícios aos pacientes reabilitados. Visando isso, a presente dissertação verificou a capacidade de inclusão e a eficiência bactericida do biocida policloreto de dialildimetilamônio (PDADMAC) em resina acrílica autopolimerizável (RAAQ) e termopolimerizável (RAAT), e silicone de uso médico. Os resultados mostraram que o biocida PDADMAC quando dissolvido no tetrahidrofurano apresentou boa incorporação tanto nas resinas acrílicas, quimicamente ativas e termo ativas, quanto no silicone de uso médico e que apenas os corpos de prova que receberam 2 mililitros do PDADMAC em massa polimérica tiveram uma resposta bactericida eficaz.


The facial and intraoral prosthesis has an important role in the aesthetics and return of some functions to patients. Through restoration of the body image can reistante to can society , thus recovering the individual's identity . The good condition of these prostheses is essential so they can perform their function properly and maintain the the area where the prostheses are inserted free of infection and inflammation. Therefore, no formation of bacteria colonies and biofilms in the chosen materials for making these prostheses , will bring benefits to patients rehabilitated. The present work evaluated the capability of inclusion and the bactericidal efficiency of the biocide poly(diallyldimethylammonium chloride) ( pDADMAC ) of acrylic resin autopolymmerized ( RAAQ ) and thermal polymerized ( RAAT ) , and silicone medical use. The results showed that the biocide pDADMAC when dissolved in tetrahydrofuran presented a good incorporation in both acrylic resins and in the medical grade silicone and that only the samples that received 2 ml of pDADMAC in polymer had an effective bactericidal response.


Subject(s)
Humans , Male , Female , Silicone Elastomers/analysis , Silicone Elastomers , Silicone Elastomers/adverse effects , Silicone Elastomers/chemical synthesis , /analysis , /methods , /prevention & control , Polymers/analysis , Polymers/adverse effects , Polymers/chemistry
5.
Rev. Soc. Bras. Cir. Plást., (1997) ; 20(4): 248-252, out.-dez. 2005. ilus
Article in Portuguese | LILACS | ID: lil-420625

ABSTRACT

Uma série de substâncias vem sendo utilizada em larga escala por cirurgiões plásticos e dermatologistas para correção de rugas na face. O sucesso dos preenchimentos está diretamente relacionado com a substância escolhida e com a técnica utilizada para realização do procedimento. São apresentados quatro casos de reações adversas com o uso dos seguintes materiais de preenchimento: poliacrilamida, polimetilmetacrilato e dimetilsiloxane. Foram observadas diferentes reações adversas decorrentes do uso de substâncias de preenchimento, levando a resultados desastrosos e altamente desagradáveis por se localizarem na face. A substância ideal para preenchimento de partes moles ainda não foi desenvolvida e, portanto, esses procedimentos podem resultar em reações adversas associadas ao tipo de substância empregada ou ao erro de técnica de aplicação.


Subject(s)
Adult , Male , Female , Humans , Polymers/adverse effects , Cosmetic Techniques/adverse effects , Injections, Subcutaneous/adverse effects , Methods
6.
Arq. odontol ; 40(3): 257-270, 2004. ilus, tab
Article in Portuguese | LILACS, BBO | ID: biblio-849892

ABSTRACT

Investigou-se o efeito do jato de óxido de alumínio e de três substâncias modoficadoras de superfície na resistência adesiva do polímero de vidro Artglass« ao cimento resinoso C&B«. Foram confeccionadas 60 pastilhas de Artglass«, medindo 7,0mm de diâmetro e 5,0mm de altura, e 60 pastilhas medindo 5,0mm de diâmetro e 3,0mm de altura. As pastilhas foram distribuídos em 6 grupos (n=10), e receberam os seguintes tratamentos superficiais: G1- adesivo Alloybond«; G2- agente silano Scotchprimer RelyX« seguido pelo Alloybond«; G3- c&b Liquid«; G4- jato de óxido de alumínio e adesivo Alloybond«; G5- jato e agente silano Scotchprimer« seguido pelo Alloybond«; G6- jato e c&b Liquid«. A cimentação das pastilhas foi realizada com o cimento resinoso C&B« a uma carga de 0,5 kgf. O ensaio de cisalhamento foi realizado em uma Máquina de Ensaio Universal Instron« e após a fratura dos espécimes, as superfícies das pastilhas foram examinadas em lupa com aumento de 20x, para classificação do modo de fratura. Os resultados evidenciaram que os espécimes jateados tiveram os maiores valores de resistência adesiva; e que a apicação do silano Scotchprimer« seguida do Alloybond« gerou valores de resistência adesiva superiores aos outros modoficadores de superfície. Os espécimes não jateados apresentaram 100 por cento de fraturas na interface adesiva, predominando as fraturas no interior do cimento e complexas nos grupos jateados. Conclui-se que o jato , seguido da aplicação do silano Scotchprimer« e do Alloybond«, promoveu a maior resistência adesiva ao cisalhamento entre o Artglass« e o C&B« Cement


Subject(s)
Aluminum Oxide/adverse effects , Polymers/administration & dosage , Polymers/adverse effects , Shear Strength , Dental Cements/adverse effects , Composite Resins/therapeutic use
7.
Dermatol. argent ; 5(4): 325-8, ago.-sept. 1999. ilus
Article in Spanish | LILACS | ID: lil-252947

ABSTRACT

El lipogranuloma esclerosante (LGE) es una afección ocasionada por la inyección en partes blandas de sustancias oleosas de origen conocido o no. Debido a que se trata de una práctica clandestina, su incidencia real se desconoce. Se describen dos casos de LGE en mujeres de 63 y 33 años, que presentan lesiones en mamas, glúteos y muslos. El diagnóstico fue confirmado por los antecedentes y la histopatología


Subject(s)
Humans , Female , Adult , Middle Aged , Granuloma/etiology , Injections/adverse effects , Sclerosis/etiology , Colchicine/therapeutic use , Granuloma/drug therapy , Granuloma/pathology , Paraffin/adverse effects , Penicillamine/therapeutic use , Polymers/adverse effects , Silicones/adverse effects
8.
Arch. latinoam. nutr ; 41(4): 569-83, dec. 1991. tab
Article in Spanish | LILACS | ID: lil-108175

ABSTRACT

Se cuantificaron los polifenoles de frijol común de color blanco, negro y colorado, crudos, cocidos y secados, con y si caldo, por el método de Folin-Denis que mide polifenoles totales, y por el procedimiento de precipitación de proteína de Hagerman-Butler, que mide su actividad biológica. La evaluación consistió en determinar polifenoles en las mismas muestras durante 20 días consecutivos, utilizando tres volúmenes de extracto de una misma muestra. Los resultados obtenidos con el método de Folin-Denis, analizados estadísticamente, indicaron que la variabilidad fue diferente en los tres volúmenes de extracto de cada uno de los colores de frijol. Sin embargo, una prueba no paramétrica señaló que los promedios en los tres niveles de concentración para todos los frijoles, eran iguales. La variabilidad y los promedios en los tres niveles de extracto de frijoles negros y colorados-determinados por el método de Hagerman-Butler-fueron iguales, no siendo así con los frijoles blancos. El coeficiente de variación fue más bajo para el nivel de mayor volumen de extracto. Se encontró una correlación significativa ...


Subject(s)
Fabaceae/chemistry , Phenols/analysis , Polymers/analysis , Plant Proteins, Dietary , Analysis of Variance , Food Handling/methods , Intestinal Absorption , Methods , Nitrogen/analysis , Phenols/adverse effects , Plant Extracts/analysis , Polymers/adverse effects , Rats, Inbred Strains , Tannins/analysis , Plant Proteins, Dietary/metabolism
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