1. Laboratory of Biomaterials, Department of Chemical Engineering, Faculty of Engineering, University of Concepción, Barrio Universitario s/n, P.O.
Box 160-C, Concepción 4030000, Chile
2. Department of Physics, Faculty of Physical and Mathematical Sciences, University of Concepción, Concepción, Chile
3. Department of Instrumental Analysis, Faculty of Pharmacy, University of Concepción, Concepción, Chile
4. Department of Material, Faculty of Engineering, University of Concepción, Concepción, Chile
5. Department of Pharmacy, Faculty of Pharmacy, University of Concepción, Concepción, Chile