calorimetría diferencial de barrido. Polímeros [online]. , vol, n.4, pp ISSN Polímeros. Print version ISSN mediante calorimetría diferencial de barrido convencional y modulada con temperatura: parte II. Polímeros [online]. DSC (Calorimetría Diferencial de Barrido) STA (Termogravimetría Simultánea – Calorimetría de Barrido Diferencial Composites – Polímeros Reforzados.

Author: Nagrel Tygoshakar
Country: Vietnam
Language: English (Spanish)
Genre: Personal Growth
Published (Last): 26 May 2005
Pages: 460
PDF File Size: 7.87 Mb
ePub File Size: 12.73 Mb
ISBN: 811-2-37156-956-8
Downloads: 81299
Price: Free* [*Free Regsitration Required]
Uploader: Mulabar

This phenomenon is typically referred to as ‘burst release’. Assessment of structural modification and kinetic parameters. Recibido 16 de Abril, ; Aceptado 15 de Julio, Concerning the ring-opening polymerization of lactide and cyclic esters by coordination metal catalysts. Introduction to General Organic and Biochemistry.

Fabricación y Procesamiento de Polímeros-Detail – NETZSCH Análisis y Ensayo

Principles of Tissue Engineering. Polymer Degradation and Stability 98, Extended release systems are the methods that can achieve therapeutically effective concentrations of drug in systemic circulation over an extended period of time. Many problems are associated with conventional multiple dosing regimen of long acting therapy, such as systemic accumulation of the drug leading callorimetria side effects or toxicities, irregular profile of the plasma drug level, and poor patient compliance.

These masses were further transferred to 30 ml diethyl ether at 0 o C while being gently stirred. All other chemicals used were of analytical grade and double distilled water was used throughout the studies.


DCS: Calorimetría Diferencial de Barrido by Alejandra Campos on Prezi

Various researchers used the solid dispersion method for this purpose The precipitates were filtered using qualitative filter paper, spreaded on petri plate and dried to a constant weight.

Journal of Applied Polymer Science 99, International Journal of Pharmaceutics European Polymer Journal 19, Solid dispersions were characterized by infrared Spectroscopy IRdifferential scanning calorimetry DSCX-ray diffractometry XRD as well as content uniformity, in vitro dissolution studies in 0.

Nature Materials 8, To confirm diffusion, the data were fitted to Korsemeyer-Peppas equation.

In most of the controlled release formulations, immediately upon placement in the release medium, an initial large bolus of drug is released before the release rate reaches a stable profile.

Burst release leads to higher initial drug delivery and also reduces the effective life time of the device.

A review of polymer dissolution. Characterization of polymeric dispersions of dimenhydrinate in ethyl cellulose for controlled release. Progress in Polymer Science 35, Coprecipitation method Metformin HCl and different carriers were taken in different ratios 1: However, remote access to EBSCO’s databases from non-subscribing institutions is not allowed if the purpose of the use is for commercial gain through cost reduction or avoidance for a non-subscribing institution.

The results revealed that the preparation conditions did not make polymorphic changes or amorphization of drug within the polymer network and higher amount of polymer displayed diluting effect on physicochemical properties of drug within prepared dispersions.


Análisis térmico I. (DCS). Técnicas de caracterización de polímeros.

Materials and methods Materials: Ho G, Hwang GC. Bone regeneration by a combination of osteopromotive membranes with different BMP preparations: Determination of pollimeros vitro drug release of solid dispersions In vitro dissolution was performed using USP dissolution rate test apparatus I in ml of simulated gastric fluid 0. No warranty is given about the accuracy of the copy.

The significant dissolution observed for most solid dispersions containing MET at simulated gastric fluid became protonated at the acidic buffer pH 1.

PLGAs bearing carboxylated side chains: The dried samples were pulverized, screened through 80 mesh size sieve calorimetira stored in vacuum desiccators. European Polymer Journal 45, Characterization of solid dispersion systems IR spectroscopy IR spectra of pure drug, polymers and formulated solid dispersions were obtained with a IR spectrophotometer shimadzu IR-prestize using KBR disks.

Progress in Polymer Science 28, Ten mg of each of the solid dispersion was accurately weighed and dissolved in 10 ml phosphate buffer pH 6. The drug content was uniform in all solid dispersion systems and was in good agreement with theoretical drug content Table 1.

Journal of Controlled Release