Droval G.,CNRS Toulouse Center for Materials Elaboration and Structural Studies |
Aranberri I.,Gaiker Technological Center |
Aranberri I.,University of the Basque Country |
Bilbao A.,Gaiker Technological Center |
And 3 more authors.
Gummi, Fasern, Kunststoffe | Year: 2010
The antimicrobial activity against E. coli, St. aureus and A. niger of zinc oxide when blended with polymers has been measured by an applied dynamic method. Two polymers: poly(amide) 6 (PA6) and low density poly(ethylene) (LDPE) have been used as matrix. ZnO nanoparticles content as low as 1 % w/w in the polymers showed great antibacterial activity but no antifungal activity. The results of bacterial slaying capability of these nanocomposites was also found better when zinc oxide was dispersed in PA6, where the efficiency is similar to pure ZnO particles. The composites have been investigated by means of scanning electron microscope (SEM) and differential scanning calorimetry (DSC).
Largeteau A.,École Nationale Supérieure de Chimie de Paris |
Angulo I.,Gaiker Technological Center |
Coulet J.P.,British Petroleum |
Demazeau G.,École Nationale Supérieure de Chimie de Paris
Journal of Physics: Conference Series | Year: 2010
Food treatments implying high pressures used pre-packaging systems; consequently it appeared necessary to validate different packaging films able to be used in such processes. Two different packaging films from AMCOR FLEXIBLES have been evaluated: VIROFLEXAL: BOLSA 80 MICRAS, coextrusion PA/PE (20/60μm) RILTHENE: SEMI 20/60 MICRAS, laminate PA/PE (20/60μm) Three different physico-chemical characterizations have been developed for the evaluation of films behaviour after High Hydrostatic Pressure (HHP): (i) Mechanical properties (tensile strength and sealing strength), (ii) Oxygen permeability, (iii) Migration, through the contact with four food simulating liquids FSLs (water, acetic acid 3%, ethyl alcohol 10%, iso-octane). Two different pressures values (P 400MPa and 500MPa) have been tested, with a duration of 15 min, at ambient temperature (+20°C) and only one pressure (P=200MPa) for the experiments at low temperature (T = -20°C) with the same duration (15min). The selection of such values can be justified taking into account that experimental conditions as a temperature close to +20°C and a pressure between 400 and 500MPa are appropriated to inactivate bacteria and different others micro-organisms. Due to the efficiency of the association of hydrostatic pressure processing and low temperature (HHP/LT) [1, 2], the same films have been tested under high pressure processing (200MPa) but at negative temperature (-20°C). © 2010 IOP Publishing Ltd.
Calvo V.,Ikerlan S. Coop. |
Agirregabiria M.,Ikerlan S. Coop. |
Fernandez L.J.,Ikerlan S. Coop. |
Ezkerra A.,Ikerlan S. Coop. |
And 5 more authors.
14th International Conference on Miniaturized Systems for Chemistry and Life Sciences 2010, MicroTAS 2010 | Year: 2010
This paper reports on a novel two-chamber SU8 LabonaChip (LoC) for sample concentration, purification and Polymerase Chain Reaction (PCR). This typical sequence of reactions demands highly integrated microfluidic control. The burst valve concept presented in this work aims at addressing this problem, providing an integrated solution based on the controlled rupture of a vertical SU-8 wall. Owing to its vertical construction, the valve can be readily integrated into any geometry with low increase in footprint. A valve regulated double-chamber device for DNA concentration has been successfully fabricated and a full DNA concentration, elution and transportation protocol has been carried out.
Alonso-Villanueva J.,University del Pai |
Cuevas J.M.,Gaiker Technological Center |
Laza J.M.,University del Pai |
Vilas J.L.,University del Pai |
Leon L.M.,University del Pai
Journal of Applied Polymer Science | Year: 2010
Cis-cyclooctene was polymerized via ring- opening metathesis polymerization using a well-defined ruthenium catalyst (Grubbs' type) under varying reaction conditions. Control over molecular weight was achieved by the inclusion of a chain transfer agent and its influence on the behavior of the obtained polymers was evaluated. The resulting polymers were characterized by means of differential scanning calorimetry, thermogravimetric analysis, and dynamic mechanical thermal analysis. Taking into account their thermal behavior, samples of appropriate molecular weight were subjected to a suitable treatment by chemical crosslinking to obtain a material showing thermally induced shape memory effect. The material recovers its original shape after several cycles of deformation into different shapes. © 2009 Wiley Periodicals, Inc.
Sanches-Silva A.,National Institute of Health Dr Ricardo Jorge |
Ribeiro T.,National Institute of Health Dr Ricardo Jorge |
Albuquerque T.G.,National Institute of Health Dr Ricardo Jorge |
Paseiro P.,University of Santiago de Compostela |
And 8 more authors.
Journal of Separation Science | Year: 2012
Chitosan, a multiple applications molecule, was isolated from shrimp by-products by fermentation. The amount of chitosan in the solid fraction of the fermented extract was measured after its conversion in the respective glucosamine units. The procedure includes an acid hydrolysis (110°C, 4 h with HCl 8 M) and a derivatization with 9-fluorenylmethyl chloroformate (Fmoc-Cl). Ultra-high-pressure liquid chromatography method was developed and optimized. Excellent peaks resolution was achieved in just 10 min. The method was evaluated in what concerns to validation parameters such as linearity, repeatability, quantification limit, and recovery. Migration tests of films prepared with chitosan were carried out in two simulants: ultrapure water and ethanol 95% (v/v). © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.