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Yi, S., Chung, Y.-J., Kim, T.-E., Shin, H.-S., Yoon, S.H., Cho, J.-Y., Jang, I.-J., Shin, S.-G. and Yu, K.-S. (2011) Pharmacokinetics of Extended-Release versus Conventional Tramadol/Acetaminophen Fixed-Dose Combination Tablets: An Open-Label, 2-Treatment, Multiple-Dose, Randomized-Sequence Crossover Study in Healthy Korean Male Volunteers. Clinical Therapeutics, 33, 728-737.
http://dx.doi.org/10.1016/j.clinthera.2011.04.023

has been cited by the following article:

• TITLE: Sol-Gel Silica Matrix as Reservoir for Controlled Release of Paracetamol: Characterization and Kinetic Analysis

  AUTHORS: Tessy López, Mayra Álvarez, Paola Ramírez, Gustavo Jardón, Miriam López, Guadalupe Rodriguez, Itzel Ortiz, Octavio Novaro

  KEYWORDS: Sol-Gel Growth, Nanostructures, Biomaterials, Surface Properties

  JOURNAL NAME: Journal of Encapsulation and Adsorption Sciences, Vol.6 No.2, May 26, 2016

  ABSTRACT: Non-Steroidal Anti-Inflammatory Drugs (NSAIDs) are usually suitable candidates for the development of drug delivery devices. Sol-gel chemistry represents an easy method to obtain porous silica nanoparticles. Mesoporous silica nanomaterials have been widely used for drug delivery purposes. In this work we synthesized silica based materials using two molar alkoxide:water ratios 1:4 and 1:8, incorporating paracetamol to develop a nano-sized matrix for controlled release purposes. The samples exhibited different values for surface area, porosity, particle size and distinct punctual defects. Infrared and UV-visible spectroscopic studies were carried out to demonstrate the effect of water concentration and the adequate incorporation of paracetamol molecules. Nitrogen adsorption characterization was realized and the estimated BET surface values were from 532 to 825 m2/g. Kinetic analysis of drug release profiles was performed using the hyperbola model. Transmission electron micrographs showed that all the materials formed aggregates of small particles with size between 10 - 60 nm. Mesoporous SiO2 materials were proved to be a suitable system for controlled release of paracetamol.