English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/62127
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Controlled release of the herbicide norflurazon into water from ethylcellulose formulations

AuthorsSopeña Vázquez, F. ; Cabrera Mesa, Alegría ; Maqueda Porras, Celia ; Morillo González, Esmeralda
Issue Date2005
PublisherAmerican Chemical Society
CitationJournal of Agricultural and Food Chemistry 53(9): 3540-3547 (2005)
AbstractThe herbicide norflurazon was encapsulated in ethylcellulose (EC 40) microspheres by the solvent evaporation technique to obtain controlled release formulations. The kinetics of release of the active ingredient into the aqueous solution from different preparations was determined. It was found that the percentage release of the incorporated herbicide was a function of the composition and formation conditions of the formulations (amount of emulsifying agent, EC40/herbicide ratio, stirring speed, and percentage of pore-forming agent). The percentage of the herbicide release was related to the properties of the different microspheres obtained, such as particle size distribution, herbicide loading, or surface morphology. The release percentage depended inversely on the particle size of the microspheres and directly on the content of active ingredient and emulsifying and pore-forming agents. An empirical equation was used to fit the herbicide release data, indicating that the release of norflurazon from the various formulations is controlled by a diffusion mechanism. The time taken for 50% of the active ingredient to be released into water (T50) was calculated, showing a wide variation among the different preparations (0.95-16.4 days).
Identifiersdoi: 10.1021/jf048007d
issn: 0021-8561
e-issn: 1520-5118
Appears in Collections:(IRNAS) Artículos
Files in This Item:
File Description SizeFormat 
accesoRestringido.pdf15,38 kBAdobe PDFThumbnail
Show full item record
Review this work

Related articles:

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.