Pullulan
Mostrando 1-12 de 57 artigos, teses e dissertações.
-
1. Development and characterization of pullulan-polymethacrylate free films as potential material for enteric drug release
ABSTRACT Free films of pullulan-polymethacrylate associations were produced by casting process to develop a novel target-specific material. For characterization, tests of water vapor permeability, swelling index, infrared absorption spectroscopy, thermogravimetric analysis, scanning electron microscopy and mechanical analysis were performed. The polysacchari
Braz. J. Pharm. Sci.. Publicado em: 31/07/2017
-
2. Efficient production of pullulan by Aureobasidium pullulans grown on mixtures of potato starch hydrolysate and sucrose
Abstract Pullulan is a natural exopolysaccharide with many useful characteristics. However, pullulan is more costly than other exopolysaccharides, which limits its effective application. The purpose of this study was to adopt a novel mixed-sugar strategy for maximizing pullulan production, mainly using potato starch hydrolysate as a low-cost substrate for li
Braz. J. Microbiol.. Publicado em: 2017-03
-
3. Pullulan as a stabilizer agent of polymeric nanocapsules for drug delivery
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
Braz. J. Pharm. Sci.. Publicado em: 2016-12
-
4. FILMES BIODEGRADÁVEIS DE AMIDO DE MANDIOCA, PULULANA E CELULOSE BACTERIANA
The largest consumption of plastics in the world is referred to the synthetic polymers, which are not biodegradable and have a non-renewable source, generating a large environmental impact, especially in urban centers. As a result, in the last two decades several polymers obtained from renewable sources (biopolymers) have been studied as potential raw materi
Quím. Nova. Publicado em: 2016-11
-
5. Pullulan: an advantageous natural polysaccharide excipient to formulate tablets of alendronate-loaded microparticles
Neste trabalho relata-se a preparação de comprimidos pela compressão direta de micropartículas contendo alendronato de sódio, utilizando o pullulan como diluente. As propriedades dos comprimidos de pullulan foram comparadas com as de comprimidos de celulose microcristalina e de lactose. Os comprimidos de pullulan mostraram baixa variação no peso médi
Braz. J. Pharm. Sci.. Publicado em: 2015-03
-
6. Production of pullulan by a thermotolerant Aureobasidium pullulans strain in non-stirred fed batch fermentation process
Total 95 isolates of Aureobasidium pullulans were isolated from different flowers and leaves samples, out of which 11 thermotolerant strains produced pullulan. One thermotolerant non-melanin pullulan producing strain, designated as RG-5, produced highest pullulan (37.1±1.0 g/l) at 42ºC, pH 5.5 in 48h of incubation with 3% sucrose and 0.5% ammonium sulphate
Braz. J. Microbiol.. Publicado em: 2012-09
-
7. CCromatografia de permeaÃÃo em gel em escala semi-preservativa aplicada à caracterizaÃÃo, purificaÃÃo e fracionamento do Ãcido hialurÃnico produzido por cultivo de microorganismos / Gel Permeation Chromatography in Semi-Preparative Scale apply to the Characterization, Purification and Fractionation of Microbial Hyaluronic Acid
Hyaluronic acid (HA) is a linear, unbranched polymer, composed by simple disaccharide units, whose molar mass may range in a wide interval of distribution (104-107 Da). It is used in pharmaceutical and cosmetic applications depending on its average molecular mass. The fractionation of macromolecules of the order of magnitude of the HA may be performed by gel
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/03/2007
-
8. Enhanced production of pullulan by two strains of A. pullulans with different concentrations of soybean oil in sucrose solution in batch fermentations
Aureobasidium pullulans is a microorganism that produces pullulan (homopolysaccharide) extracellularly through a fermentation process with sugars (maltose, d-xylose, sucrose and starch) as its carbon source. Pullulan is a linear polysaccharide of D-glycopyranose containing (1 ->4)-alpha and (1 -> 6)-alpha linkages at a 2:1 ratio, is highly soluble in water a
Brazilian Journal of Chemical Engineering. Publicado em: 2006-12
-
9. Pullulan Elaboration by Aureobasidium pullulans Protoplasts
Protoplasts of Aureobasidium pullulans are capable of producing pullulan. Biosynthesis of the polymer pullulan required induction with kinetics similar to those of whole cells. The protoplasts also produced a heteropolysaccharide component containing mannose, glucose, and galactose. The relative proportions of the pullulan and heteropolysaccharide fractions
-
10. Immunoglobulin E-suppressing and immunoglobulin G-enhancing tetanus toxoid prepared by conjugation with pullulan.
Immunoglobulin E (IgE) antibody response was found to be suppressed selectively and antigen specifically in mice given an antigen conjugated with pullulan, a linear copolymer of maltotriose, whereas IgM and IgG antibody responses were enhanced. On the basis of this finding, tetanus toxin was conjugated with pullulan by cyanuric chloride in the hope that the
-
11. Pattern of action of Bacillus stearothermophilus neopullulanase on pullulan.
The action of neopullulanase from Bacillus stearothermophilus on many oligosaccharides was tested. The enzyme hydrolyzed not only alpha-(1----4)-glucosidic linkages but also specific alpha-(1----6)-glucosidic linkages of several branched oligosaccharides. When pullulan was used as a substrate, panose, maltose, and glucose, in that order, were produced as fin
-
12. New type of pullulanase from Bacillus stearothermophilus and molecular cloning and expression of the gene in Bacillus subtilis.
A new type of pullulanase which mainly produced panose from pullulan was found in Bacillus stearothermophilus and purified. The enzyme can hydrolyze pullulan efficiently and only hydrolyzes a small amount of starch. When pullulan was used as a substrate, the main product was panose and small amounts of glucose and maltose were simultaneously produced. By usi