Akademska digitalna zbirka SLovenije - logo
Institut Jožef Stefan, Ljubljana (IJS)
  • Addressing potent single molecule AFM study in prediction of swelling and dissolution rate in polymer matrix tablets
    Govedarica, Biljana ...
    Our goal was to understand and thus be able to predict the swelling behavior of xanthan matrix tablets in 28 media of various pH and ionic strengths using data obtained from single xanthan molecules ... and films 29 with atomic force microscopy. 30 Imaging was performed in 1-butanol using contact mode AFM in order to characterize single xanthan 31 chains prepared from various solutions. Image analysis was used to calculate the molecular contour, per- 32 sistence length, and radius of gyration. Nanoindentation measurements of xanthan films were carried out 33 to evaluate their mechanical properties. Increasing the ionic strength of solutions induced reductions in 34 chain parameters such as molecular contour, persistence length, and radius of gyration. Nanomechanical 35 measurements demonstrated that Youngćs moduli of xanthan films prepared from solutions with higher 36 ionic strengths are twice as large as those prepared at lower ionic strengths. This may help explain xan- 37 than matrix tabletsć reduced degree of swelling and faster dissolution rate in the presence of salts or ions. 38 We successfully come to conclusion that microscopic polymer properties such as radius of gyration and 39 persistence length are responsible for the macroscopic polymer behavior. For instance, longer persistence 40 lengths and radius of gyration of xanthan's chains result in a higher degree of swelling, corresponding to 41 softer polymer films, increased gel layers in matrix, and a slower release rate of the incorporated drug 42 from the tablets.
    Vir: European journal of pharmaceutics and biopharmaceutics. - ISSN 0939-6411 (Vol. 80, no. 1, 2012, str. 217-225)
    Vrsta gradiva - članek, sestavni del
    Leto - 2012
    Jezik - angleški
    COBISS.SI-ID - 3101809

    Povezava(-e):

    http://www.sciencedirect.com/science/article/pii/S0939641111002694
    http://www.sciencedirect.com/science/journal/aip/09396411
    DOI

Vnos na polico