These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: 5-ASA loaded chitosan-Ca-alginate microparticles: Preparation and physicochemical characterization.
    Author: Mladenovska K, Cruaud O, Richomme P, Belamie E, Raicki RS, Venier-Julienne MC, Popovski E, Benoit JP, Goracinova K.
    Journal: Int J Pharm; 2007 Dec 10; 345(1-2):59-69. PubMed ID: 17616284.
    Abstract:
    The objective of the work was to prepare chitosan-Ca-alginate microparticles that can effectively deliver 5-ASA to the colon after peroral administration. For these requirements, a spray-drying technique was applied to 5-ASA/sodium alginate aqueous solution to obtain spherical particles having a mean diameter less than 10microm. The microparticles formed were cross-linked and coated into solution of CaCl(2) and chitosan to obtain stable microsystem. (1)H NMR and UV-vis spectra of 5-ASA have shown no degradation when working in adequate conditions, such as light protection, freshly prepared solution and use of nitrogen to prevent the oxidative self-coupling of 5-ASA moieties. By imaging with SEM, acceptable spherical morphology was observed, but also flattened, disk-shaped particles of smooth surface and low porosity. CLSM imaging showed dominant localization of chitosan in the particle wall, while for alginate, a homogeneous distribution throughout the particle was observed giving the particles negative charge. In the FTIR spectra of 5-ASA loaded Ca-alginate microparticles the characteristic peaks of 5-ASA were not altered indicating no covalent interaction between the drug and the polymer. DSC and X-ray diffraction studies revealed that 5-ASA was molecularly dispersed within the chitosan-Ca-alginate microparticles during the production process.
    [Abstract] [Full Text] [Related] [New Search]