Preparation of spray dried chitosan microspheres with differents kinds of crosslinking agents useful in genic vaccination / Preparação de microesferas de quitosana por spray drying com diferentes tipos de reticulação para uso na vacinação genica

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

In recent years, chitosan, a natural cationic polysaccharide, has attracted considerable attention as a new non-toxic polymer having favourable characteristics such as biocompatibility, biodegradability and mucoadhesiveness. Chitosan has found several applications as a biomaterial in tissue engineering as well in controlling drug release by various routes of delivery including oral and nasal. For most of the drug delivery applications, due to its hydrophilic properties, chitosan crosslinking becomes a strategy to control properties of these systems such as sweling properties, superficial charge, among others that affect release kinetic. The chitosan crosslinking can be chemical, formed by irreversible covalent bounds, and physical crosslinking, formed by several reversibles bounds (ionic bounds, polyelectrolyte complex). In this work, modified delivery system made of chitosan (microspheres) had been obtained using spray drying technique. It was studied, to follow, chemical and physical crosslinking of that: 1) chemical crosslinking with different aldehydes, glyceraldehyde (GAL) ou glutaraldehyde (GLU); 2) physical crosslinking with sodium hyaluronate (HNa). The particles had been characterized by swelling properties, surface charge, surface area, thermal analysis, humidity quantification, crystalinity, infrared spectroscopy and elemental analysis

ASSUNTO(S)

aldeidos chitosan aldehydes spray drying secagem em spray quitosana

ACESSO AO ARTIGO

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