Methylcellulose
Mostrando 1-12 de 170 artigos, teses e dissertações.
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1. Postharvest conservation of ‘Avalanche’ cut roses with hydroxypropyl methylcellulose-beeswax natural coating
RESUMO O uso de recobrimentos na pós-colheita de frutas e hortaliças é objeto de estudos há vários anos pela sua capacidade de prolongar a vida de prateleira de vegetais. No entanto, pouco se sabe acerca do uso destes recobrimentos na conservação pós-colheita de flores de corte. O objetivo deste trabalho foi avaliar o efeito de diferentes concentraç
Ciênc. agrotec.. Publicado em: 07/11/2019
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2. Development and evaluation of multiparticulate biphasic system for the treatment of circadian diseases
Multiparticulate systems have biopharmaceutical advantages when compared to the monolithic systems, once they allow different patterns of drug release and can be used in different treatments. The aim of the present work was to develop a biphasic controlled release delivery system, using propranolol hydrochloride (PROP) that can be used for the treatment of c
Braz. J. Pharm. Sci.. Publicado em: 08/04/2019
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3. Preparation and in vitro & in vivo evaluation of cephalexin matrix tablets
The purpose of the study is to develop cephalexin controlled-release matrix tablets by using lower proportions of release retardant polymer and to establish their in vitro & in vivo correlation. Tablets were compressed by incorporating polymers in a matrix form along with drug which prolong the drug release. Twelve formulations were prepared by mixing ethyl
Braz. J. Pharm. Sci.. Publicado em: 29/11/2018
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4. Physical properties and biological effects of mineral trioxide aggregate mixed with methylcellulose and calcium chloride
Abstract Objectives: Methylcellulose (MC) is a chemical compound derived from cellulose. MTA mixed with MC reduces setting time and increases plasticity. This study assessed the influence of MC as an anti-washout ingredient and CaCl2 as a setting time accelerator on the physical and biological properties of MTA. Material and Methods: Test materials were di
J. Appl. Oral Sci.. Publicado em: 2017-12
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5. Floating ability and drug release evaluation of gastroretentive microparticles system containing metronidazole obtained by spray drying
Abstract Gastroretentive floating microparticles were developed and evaluated for the controlled metronidazole delivery for treatment of gastric disease. Floating microparticles, varying in proportions of chitosan and hydroxypropyl methylcellulose or ethylcellulose, were obtained by spray drying. Floating microparticles were characterized by physicochemical
Braz. J. Pharm. Sci.. Publicado em: 20/04/2017
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6. Effects of Methylcellulose on the Properties and Morphology of Polysulfone Membranes Prepared by Phase Inversion
Polymer solutions of polysulfone (PSf) and methylcellulose (MC) in 1-methyl-2-pyrrolidone (NMP) were used to prepare ultrafiltration membranes by the phase inversion technique via immersion precipitation. The effect of MC additive on the structure and performances of the membranes was studied. The obtained membranes were characterized by scanning electron mi
Mat. Res.. Publicado em: 23/01/2017
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7. In vitro evaluation of sustained released matrix tablets containing ibuprofen: a model poorly water-soluble drug
ABSTRACT A matrix system was developed that releases ibuprofen (IB) over a 12-hour period and the influence of the polymer type and concentration on the release rate of the drug was evaluated. Tablets containing different concentrations of Carbopol (CP), hydroxypropyl methylcellulose (HPMC), or ethyl cellulose (EC) were prepared using direct compression and
Braz. J. Pharm. Sci.. Publicado em: 2016-12
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8. Synthesis and Characterization of Methylcellulose Produced from Bacterial Cellulose under Heterogeneous Condition
In this work, methylcellulose (MC) was produced from bacterial cellulose (BC), using dimethyl sulfate in a 3 h (MC3h) or 5 h (MC5h) reaction under heterogeneous conditions, with reagent substitution at each hour. MC3h showed a degree of substitution (DS) of 2.26 ± 0.13 and MC5h showed a DS of 2.33 ± 0.05. The two samples were characterized by Fourier trans
J. Braz. Chem. Soc.. Publicado em: 2015-09
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9. Mechanical, thermal, and barrier properties of methylcellulose/cellulose nanocrystals nanocomposites
In this work, the effects of incorporating cellulose nanocrystals from soy hulls (WSH30) on the mechanical, thermal, and barrier properties of methylcellulose (MC) nanocomposites were evaluated. MC/WSH30 nanocomposite films with different filler levels (2, 4, 6, 8, and 10%) were prepared by casting. Compared to neat MC film, improvements in the mechanical an
Polímeros. Publicado em: 2014-12
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10. Nanocompósito de polpa de mamão e nanopartículas de quitosana para aplicação em embalagens
Nanocomposite materials have been incorporated into biopolymers, (e.g. hydroxypropyl methylcellulose), to improve their physical and chemical properties and enable them to be applied in food packaging, especially for their biodegradable and renewable properties. With this addition, fruit puree has been incorporated into the films to confer nutritional proper
Quím. Nova. Publicado em: 2014-07
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11. Evaluation of conjunctival bacterial flora in patients with Stevens-Johnson Syndrome
OBJECTIVE: To determine the conjunctival bacterial flora present in patients with Stevens-Johnson syndrome. METHODS: A prospective study of the conjunctival bacterial flora was performed in 41 eyes of 22 patients with Stevens-Johnson syndrome. The information gathered included the patient's sex and age, the duration of disease, the cause of Stevens-Johnson
Clinics. Publicado em: 2014-03
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12. Synthesis and characterization of methylcellulose from cellulose extracted from mango seeds for use as a mortar additive
Methylcellulose was produced from the fibers of Mangifera indica L. Ubá mango seeds. MCD and MCI methylcellulose samples were made by heterogeneous methylation, using dimethyl sulfate and iodomethane as alkylating agents, respectively. The materials produced were characterized for their thermal properties (DSC and TGA), crystallinity (XRD) and Degree of Sub
Polímeros. Publicado em: 14/02/2012