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Registros recuperados: 9
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A fully validated microbiological assay for daptomycin injection and comparison to HPLC method BJPS
Christ,Ana Paula; Machado,Mariana Souto; Ribas,Karla Giacomelli; Schwarzbold,Alexandre Vargas; Silva,Cristiane de Bona da; Adams,Andréa Inês Horn.
abstract Daptomycin (DPT) was the first lipopeptide antibiotic available for commercialization. It is active against gram-positive bacteria, including resistant strains. This work aimed to develop and validate a turbidimetric microbiologic assay to determine daptomycin in an injectable form. A 3x3 design was employed, at concentrations of 1, 2 and 4.0 µg/mL. The microorganism test used was Staphylococcus aureus ATCC 6538p, and Antibiotic Medium 3 was used as the culture medium. Method validation demonstrated that the bioassay was linear (r=0.9995), precise (RSD=2.58%), accurate (recovery 100.48± 2.11%), and robust. Degradation kinetics was also performed in an alkaline medium, indicating that daptomycin degradation follows first order kinetics under these...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Daptomycin/determination; Daptomycin injection/quality control; Turbidimetric microbiological assay/quantitative analysis..
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502015000400775
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Antifungal activity of the lemongrass oil and citral against Candida spp. BJID
Silva,Cristiane de Bona da; Guterres,Sílvia S.; Weisheimer,Vanessa; Schapoval,Elfrides E.S..
Superficial mycoses of the skin are among the most common dermatological infections, and causative organisms include dermatophytic, yeasts, and non-dermatophytic filamentous fungi. The treatment is limited, for many reasons, and new drugs are necessary. Numerous essential oils have been tested for both in vitro and in vivo antifungal activity and some pose much potential as antifungal agents. By using disk diffusion assay, we evaluated the antifungal activity of lemongrass oil and citral against yeasts of Candida species (Candida albicans, C. glabrata, C. krusei, C. parapsilosis and C. tropicalis). This study showed that lemongrass oil and citral have a potent in vitro activity against Candida spp.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Lemongrass oil; Citral; Antifungal activity; Candida spp.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702008000100014
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Cytotoxicity and antioxidant activity of goldenberry extracts obtained with high intensity ultrasound Ciência Rural
Codevilla,Cristiane Franco; Tischer,Bruna; Gindri,Amanda Leitão; Nogueira-Librelotto,Daniele Rubert; Barin,Juliano Smanioto; Silva,Cristiane de Bona da; Rolim,Clarice Madalena Bueno; Zepka,Leila Queiroz; Menezes,Cristiano Ragagnin de.
ABSTRACT: The high intensity ultrasound-assisted extraction (HIU) is one of the most simple, quick and efficient techniques for the extraction of phenolic and other antioxidant compounds from plants. This is the first application of HIU for the extraction of these compounds from goldenberry fruit. The HIU and conventional extraction techniques showed similar results regarding to phenolic compounds and antioxidant capacity. However, the time required for HIU extraction (5min) was 24 times lower than conventional extraction (120min). Phenolic compounds reported were chlorogenic acid, caffeic acid and rutin. In vitro cytotoxicity assays were used for evaluation of extracts and the results showed that in a wide range of concentration, the extract maintains...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Goldenberry; Sonication; Antioxidant capacity; Cytotoxicity; High performance liquid chromatography.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018000200752
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Development, characterization and viability study of probiotic microcapsules produced by complex coacervation followed by freeze-drying Ciência Rural
Silva,Thaiane Marques da; Barin,Juliano Smanioto; Lopes,Eduardo Jacob; Cichoski,Alexandre José; Flores,Erico Marlon de Moraes; Silva,Cristiane de Bona da; Menezes,Cristiano Ragagnin de.
ABSTRACT: Technique of complex coacervation was used to produce microcapsules of Lactobacillus acidophilus La-5 encapsulated in gelatin and gum arabic which were then freeze-drying. Microcapsules were characterized using scanning electron and optical microscopy, and resistance of probiotics was evaluated during release into a simulated gastrointestinal tract and storage at different temperatures. The complex coacervation process produced microcapsules with a high encapsulation efficiency (77.60% and 87.53%), ranging from 127.14-227.05 μm with uniform distribution. Microencapsulation was an efficient approach to achieve significant protection of probiotics against simulated gastrointestinal conditions compared with free cells. Encapsulation also improved...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Microencapsulation; Lactobacillus acidophilus; Gelatin; Gum Arabic.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019000700752
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Encapsulation of Lactobacillus acidophilus La-5 and Bifidobacterium Bb-12 by spray drying and evaluation of its resistance in simulated gastrointestinal conditions, thermal treatments and storage conditions Ciência Rural
Nunes,Graciele Lorenzoni; Motta,Mariana Heldt; Cichoski,Alexandre José; Wagner,Roger; Muller,Édson Irineu; Codevilla,Cristiane Franco; Silva,Cristiane de Bona da; Menezes,Cristiano Ragagnin de.
ABSTRACT: Lactobacillus acidophillus La-5 (ML) and Bifidobacterium Bb-12 (MB) microparticles were produced at different temperatures by spray dryer. The influence of different temperatures on the viability, encapsulation efficiency, water activity and moisture were evaluated. Microparticles that presented more viability were submitted to thermal resistance, gastrointestinal simulation, storage stability, morphology and particle size analyses. Drying temperature of 130°C showed higher encapsulation efficiency, 84.61 and 79.73% for Lactobacillus acidophillus (ML) and Bifidobacterium Bb-12 (MB) microparticles, respectively. In the evaluation of thermal resistance and gastrointestinal simulation, the microparticles of Lactobacillus acidophillus La-5 (ML)...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Spray dryer; Viability; Probiotics.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018000600751
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Improvement of the viability of probiotics (Lactobacillus acidophilus) by multilayer encapsulation Ciência Rural
Menezes,Maria Fernanda da Silveira Cáceres de; Silva,Thaiane Marques da; Etchepare,Mariana de Araújo; Fonseca,Bruna de Souza; Sonza,Vandré Pinto; Codevilla,Cristiane Franco; Barin,Juliano Smanioto; Silva,Cristiane de Bona da; Menezes,Cristiano Ragagnin de.
ABSTRACT: This study produced pectin microcapsules containing Lactobacillus acidophilus by external ionic gelation, followed by the adsorption of whey protein and pectin to form multilayers. The viability of free and microencapsulated lactobacilli was evaluated after in vitro exposure to gastrointestinal conditions. They were also assessed by heat treatment, and stability was examined at -18 °C, 5 °C and 25 °C for 120 days. Exposure to different pHs, simulating passage through the gastrointestinal tract, showed that treatment of the microcapsules with only pectin (LA/P0) and with one and two layers of whey protein (treatments LA/P1 and LA/P3, respectively), were able to protect Lactobacillus acidophilus , with microcapsules increasing the release of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pectin; Whey protein concentrate; External ionic gelation.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019000900751
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Microencapsulação de probióticos por spray drying: avaliação da sobrevivência sob condições gastrointestinais simuladas e da viabilidade sob diferentes temperaturas de armazenamento Ciência Rural
Silva,Pablo Teixeira da; Fries,Leadir Lucy Martins; Menezes,Cristiano Ragagnin de; Silva,Cristiane de Bona da; Soriani,Hilda Hildebrand; Bastos,Juliana de Oliveira; Motta,Mariana Heldt; Ribeiro,Roseane Fagundes.
O objetivo deste trabalho foi avaliar microcápsulas contendo Bifidobacterium animalis e Lactobacillus acidophilus, produzidas por spray drying. Ensaios de sobrevivência foram conduzidos para avaliar a resistência dos probióticos a condições gastrointestinais simuladas e a sua viabilidade durante 120 dias de armazenamento a 4ºC e 25ºC, além da análise morfológica das microcápsulas. A microencapsulação protegeu os probióticos das condições gastrointestinais simuladas, os quais permaneceram viáveis após 120 dias de armazenamento a 4ºC e 25ºC, sendo mais viáveis a 4ºC. As microcápsulas apresentaram forma esférica, com superfície contínua relativamente lisa e sem fissuras. O estudo indica que microcápsulas de B. animalis e L. acidophilus, produzidas por spray...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bifidobacterium animalis; Lactobacillus acidophilus; Microcápsulas.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782015000701342
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Microencapsulation: concepts, mechanisms, methods and some applications in food technology Ciência Rural
Silva,Pablo Teixeira da; Fries,Leadir Lucy Martins; Menezes,Cristiano Ragagnin de; Holkem,Augusto Tasch; Schwan,Carla Luisa; Wigmann,Évelin Francine; Bastos,Juliana de Oliveira; Silva,Cristiane de Bona da.
Microencapsulation is a process in which active substances are coated by extremely small capsules. It is a new technology that has been used in the cosmetics industry as well as in the pharmaceutical, agrochemical and food industries, being used in flavors, acids, oils, vitamins, microorganisms, among others. The success of this technology is due to the correct choice of the wall material, the core release form and the encapsulation method. Therefore, in this review, some relevant microencapsulation aspects, such as the capsule, wall material, core release forms, encapsulation methods and their use in food technology will be briefly discussed.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Microcapsules; Microencapsulation; Controlled release.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782014000701304
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Pullulan as a stabilizer agent of polymeric nanocapsules for drug delivery BJPS
Chassot,Janaíne Micheli; Ferreira,Luana Mota; Gomes,Felipe Pereira; Silva,Cristiane de Bona da; Tasso,Leandro; Cruz,Letícia.
ABSTRACT Polymeric stabilizers have received attention in the preparation of nanostructured systems due to their ability to enhance formulation stability. Considering this, the objective of this work was to prepare poly(ε-caprolactone) nanocapsules using the pullulan as a polymeric stabilizer. The nanocapsules were prepared using the interfacial deposition method of preformed polymers and they were characterized in terms of pH, average diameter, polydispersity index, zeta potential, beclomethasone dipropionate content, encapsulation efficiency, photostability and drug release profiles. The formulations showed physicochemical characteristics consistent with nanocarriers for drug delivery such as: average diameter lower than 270 nm, polydispersity indexes...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Pullulan; Nanocapsules/diffusion technique; Pullulan/polymeric stabilizer; Biocompatible polymers; Beclomethasone dipropionate/nanocapsules..
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502016000400735
Registros recuperados: 9
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