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Registros recuperados: 12
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Alginate/hydrophobic HPMC (60M) particulate systems: new matrix for site-specific and controlled drug delivery BJPS
Ghosal,Kajal; Ray,Sarbani Dey.
This study aimed to obtain site-specific and controlled drug release particulate systems. Some particulates were prepared using different concentrations of sodium alginate (Na-Alg) alone and others were formulated using different proportions of Na-Alg with hydroxypropyl methylcellulose (HPMC) stearoxy ether (60M viscosity grade), a hydrophobic form of conventional HPMC, using diclofenac potassium (DP) by ion-exchange methods. Beads were characterized by encapsulation efficiency, release profile, swelling, and erosion rate. The suitability of common empirical (zero-order, first-order and Higuchi) and semi-empirical (Ritger-Peppas and Peppas-Sahlin) models was studied to describe the drug release profile. The Weibull model was also studied. Models were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Drugs/release particulate systems; Drugs/release profile; Hydroxypropyl methylcellulose stearoxy ether; Sodium alginate; Direct fitting; Case II transport; Beads/characterization; Beads/release kinetics.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502011000400021
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Application of Response Surface Methodology to study the effect of different calcium sources in fish muscle-alginate restructured products Ciênc. Tecnol. Aliment.
Moreno,Helena María; Carballo,José; Borderías,Javier.
Sodium alginate needs the presence of calcium ions to gelify. For this reason, the contribution of the calcium source in a fish muscle mince added by sodium alginate, makes gelification possible, resulting a restructured fish product. The three different calcium sources considered were: Calcium Chloride (CC); Calcium Caseinate (CCa); and Calcium lactate (CLa). Several physical properties were analyzed, including mechanical properties, colour and cooking loss. Response Surface Methodology (RSM) was used to determine the contribution of different calcium sources to a restructured fish muscle. The calcium source that modifies the system the most is CC. A combination of CC and sodium alginate weakened mechanical properties as reflected in the negative linear...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sodium alginate; Calcium chloride; Calcium caseinate; Calcium lactate; Restructured fish product.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612011000100032
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Avaliação da qualidade de maçãs (Malus domestica Borkh.) CV. gala minimamente processadas, tratadas com diferentes coberturas comestíveis. Repositório Alice
FLORES CANTILLANO, R. F.; SEIFERT, M.; RIBEIRO, J. A.; SILVEIRA, C. F.; NOGUEIRA, D.; NORA, L..
2015
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Fécula de mandioca; Amido de arroz; Alginato de sódio; Fruto fresco; Manioc starch; Rice starch; Sodium alginate; Fresh-fruit.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1022335
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Development and evaluation of calcium alginate beads prepared by sequential and simultaneous methods BJPS
Mandal,Sanchita; Kumar,S. Senthil; Krishnamoorthy,Balakrishnam; Basu,Sanat Kumar.
The objective of this study was to develop a sustained release dosage form of Trimetazidine dihydrochloride (TMZ) using a natural polymeric carrier prepared in a completely aqueous environment. TMZ was entrapped in calcium alginate beads prepared with sodium alginate by the ionotropic gelation method using calcium chloride as a crosslinking agent. The drug was incorporated either into preformed calcium alginate gel beads (sequential method) or incorporated simultaneously during the gelation stage (simultaneous method). The beads were evaluated for particle size and surface morphology using optical microscopy and SEM, respectively. Beads produced by the sequential method had higher drug entrapment. Drug entrapment in the sequential method was higher with...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sodium alginate; Calcium alginate beads; Trimetazidine dihydrochloride; Ionotropic gelation.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502010000400021
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Diseño y caracterización de microcápsulas de seleniometionina. Colegio de Postgraduados
Valdiviezo Morales, Liliana.
El objetivo del presente estudio fue diseñar y caracterizar microcápsulas de liberación controlada de seleniometionina de administración vía intramamaria, con dos diferentes de tipos de agentes encapsulantes (carboximetilcelulosa de sodio (NaCMC) y alginato de sodio (/(C6H7NaO6)n)). Las microcápsulas fueron elaboradas por el método de secado por atomización; se utilizó un secador mini Spray-dryer. La caracterización morfológica de las microcápsulas fue mediante microscopía electrónica de barrido. La distribución de las partículas por tamaño para ambos sistemas se determinó con un equipo MasterSize X (1.2b MALVERN) y etilenglicol como dispersante. Se evaluó la cantidad de seleniometionina total encapsulada, el porcentaje de rendimiento, el porcentaje de...
Palavras-chave: Seleniometionina; Microcápsulas; Cinética de liberación; Alginato de sodio; Selenomethionine; Carboximetilcelulosa de sodio; Microcapsules; Release kinetics; Sodium carboxymethylcellulose; Sodium alginate; Maestría; Ganadería.
Ano: 2012 URL: http://hdl.handle.net/10521/738
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Edible active coatings incorporated with Cinnamomum cassia and Myristica fragrans essential oils to improve shelf-life of minimally processed apples Ciência Rural
Santos,Sabrina Miqueletti dos; Malpass,Geoffroy Roger Pointer; Okura,Mônica Hitomi; Granato,Ana Claudia.
ABSTRACT: The effect of the incorporation of cinnamon (Cinnamomum cassia) and nut meg (Myristicafragrans) essential oils in alginate-based edible coatings that were applied on minimally processed apples, is reported. The minimum inhibitory concentrations were 1.25mg.mL-1 (cinnamon) and 2.50mg.mL-1 (nutmeg), against both Escherichia coli and Penicillium commune. Over storage periods there was a significant reduction in the E. coli and P. commune counts compared to the control. The extent of enzymatic browning was also significantly reduced in the coated samples. In the coated minimally processed apples sensory tests, the flavor had the lowest rating of the properties analyzed, for both treatments, followed by aroma and firmness.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sodium alginate; Cinnamon; Nut meg; Malus domestica; Food security.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018001200751
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Encapsulated Somatic Embryos and Zygotic Embryos for Obtaining Artificial Seeds of Rauli-Beech (Nothofagus alpina (Poepp. & Endl.) Oerst.) Chilean J. Agric. Res.
Cartes R,Priscila; Castellanos B,Hermes; Ríos L,Darcy; Sáez C,Katia; Spierccolli H,Scarlette; Sánchez O,Manuel.
Somatic and zygotic embryos from mature seeds of rauli-beech, Nothofagus alpina (Poepp. & Endl.) Oerst., were encapsulated in different artificial endosperms in order to generate a cover that fulfills the function of nourishment and protection of the embryos, facilitating their later germination. The content of sodium alginate varied by 4%, 3%, and 2%, as did the immersion time in calcium chloride (CaCl2), which acts as complexing agent. The artificial endosperm components of the Murashige and Skoog medium (MS) were added, supplemented with 0.5 mg L-1 indolacetic acid (IAA), 0.5 mg L-1 naphthaleneacetic acid (NAA), 2 mg L-1 6-benzylaminopurine (BAP) and 30 g L-1 sucrose. The germinative behaviors of encapsulated somatic and zygotic embryos were...
Tipo: Journal article Palavras-chave: Rauli-beech; Somatic embryogenesis; Synthetic seed; Sodium alginate.
Ano: 2009 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000100014
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Encapsulation of flaxseed oil extract in alginate-salep system by ionic gelation BJPS
Wissam,Zam; Samer,Housheh.
The objective of the current study was to encapsulate flaxseed oil extracted from finely grounded flaxseed powder and determined for its fatty acids content by GC/FID. Ionotropic gelation method was used to form beads containing 40% flaxseed oil with vitamin E being used as an antioxidant agent. The study employed calcium chloride solution as crosslinking agent with a combination of sodium alginate and salep. The effect of polymer concentrations and calcium chloride concentration on the morphology, entrapment efficiency and oil release was studied. The encapsulation efficiency reached 93.46 ± 0.064% using 0.6% of salep and 2% sodium alginate with 0.3M calcium chloride gelling solution. In SGF medium, the matrix released only about 28.56% of the entrapped...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Flaxseed oil; Sodium alginate; Salep; Beads.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502019000100578
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Enhancement of chitosanase production by cell immobilization of Gongronella sp. JG BJM
Zhang,Pingping; Zhou,Wei; Wang,Peng; Wang,Li; Tang,Mingli.
Chitosanase production of Gongronella sp. JG cells immobilized in calcium alginate gel and polyurethane foam was compared with that of the free cells, there was a 60% increase in the enzyme yield (2429 U/L) compared to the highest yield obtained from free cells (1513 U/L). The optimal immobilization parameters (concentrations of sodium alginate, calcium chloride, bead inoculums, bead diameter, etc) for the enhanced production of chitosanase were determined as: sodium alginate 2% (w/v), 0.1 M calcium chloride, inoculum 10 mL beads to 100 mL production media and 2.7 mm bead diameter. Maximum chitosanase production was achieved with initial pH of 5.5 and temperature of 30 ºC. The alginate beads had well stability, retained 85% ability of enzyme production...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chitosanase production; Gongronella sp. JG; Cell immobilization; Sodium alginate.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822013000100029
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Equipment design for biosorption studies with microorganisms Electron. J. Biotechnol.
Jensen,Thomas E; Crang,Mary C; Crang,Richard F.E..
Two laboratory devices have been designed for experimental use in biosorption studies involving the uptake and controlled release of elements from encapsulated living cells of microorganisms. The first device is an alginate bead maker capable of producing uniform (1.5 mm diameter) sodium alginate beads with encapsulated microorganisms. The second device is a flow-cell that can subject the encapsulated microorganisms to changing fluids, streaming gaseous microaerophyllic conditions, and which also allows for samples of fluid and beads to be extracted at any time during changing experimental conditions. Both devices are novel and simple in their design, and enable improved accuracy and precise handling of encapsulated specimens with minimal labour and...
Tipo: Journal article Palavras-chave: Bead maker; Biosorption; Flow-cell; Sodium alginate.
Ano: 2008 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000400014
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Immobilization of ammonia-oxidizing bacteria by polyvinyl alcohol and sodium alginate BJM
Dong,Yuwei; Zhang,Yanqiu; Tu,Baojun.
Abstract Ammonia-oxidizing bacteria were immobilized by polyvinyl alcohol (PVA) and sodium alginate. The immobilization conditions and ammonia oxidation ability of the immobilized bacteria were investigated. The following immobilization conditions were observed to be optimal: PVA, 12%; sodium alginate, 1.1%; calcium chloride, 1.0%; inoculum concentration, 1.3 immobilized balls/mL of immobilized medium; pH, 10; and temperature, 30 °C. The immobilized ammonia-oxidizing bacteria exhibited strong ammonia oxidation ability even after being recycled four times. The ammonia nitrogen removal rate of the immobilized ammonia-oxidizing bacteria reached 90.30% under the optimal immobilization conditions. When compared with ammonia-oxidizing bacteria immobilized by...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ammonia-oxidizing bacteria; Immobilization; Polyvinyl alcohol; Sodium alginate; Ammonia oxidation.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822017000300515
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Physiology and postharvest conservation of ‘Paluma’ guava under coatings using Jack fruit seed-based starch Rev. Bras. Frutic.
Rodrigues,Antonio Augusto Marques; Silva,Silvanda de Melo; Dantas,Ana Lima; Silva,Antonio Fernando da; Santos,Leonardo da Silva; Moreira,Dayse das Neves.
Abstract The aim of this work was to evaluate the effect of jackfruit seed starch-based (S) coatings, added to chitosan and alginate on the physiology and maintenance of quality of cold stored ‘Paluma’ guavas, followed by transfer to the room condition. The design was the completely randomized, in a 4x2 factorial scheme, in 4 replications, with 4 coatings (dispersion of S - 4%; S 2% + chitosan - 2% (SC); S - 2% + alginate - 2% (SA); and the uncoated control), in 2 environments (refrigerated (10±2 °C e 80±2% RH) with transfer to room condition (25±3 °C e 75±4% HR)), on the 16th and 20th day of cold storage. The SC and SA coatings were efficient in reducing the respiratory rate in fruits during 10 days at room condition. The SC coating delayed fruit...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Artocarpus heterophyllus; Fruit waste; Chitosan; Sodium alginate; Fruit quality.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452018000200303
Registros recuperados: 12
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