Surface modification of PDMS based microfluidic systems by tensides

The material aspects of a polymer based microfluidic structure were characterised considering the compatibility of the system with bioanalytical applications. The polydimethylsiloxane (PDMS) based channel system is to be integrated in a full polymer photonic biosensor device developed within the European Union project P3SENS (FP7-ICT4-248304). This work is intended to define a modified material composition, which is appropriate to improve both the wettability and the non-specific protein binding characteristics of the PDMS significantly. Triton X-100 (Sigma-Aldrich) surfactant was added to the raw PDMS before polymerisation. The influence of the tenside was studied considering the polymerisation reaction, the surface characteristics and the functional applicability. To test the hydrodynamic behaviour and non-specific protein adsorption on the surfaces, phosphate buffered saline (PBS) solution and fluorescent labelled human serum albumin (HSA) was applied in a microfluidic capillary system. © (2013) Trans Tech Publications, Switzerland

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Élelmiszeranalitikai körvizsgálatok I. : sör eredeti extrakt tartalmának meghatározása

The evaluation and the results obtained by inter-laboratory test of the distillation’s method prescribed by the standard MSZ 8761/3 — 77 for the determination of the extract content of the beer are described. The author evaluates the results of 17 food control stations in case of two different samples by the standard ISO 5725 using in the statistical analysis of the data Cochran’s maximum variance test and Dixon’s outlier test. The repeatability is 0,13%, the reproducibility is 0,25%. L’auteur fait connaitre l’interpretation et les résultats de l’essai interlaboratoire organisé á examiner la méthode concluante mentionnée ci-dessus. Á la base des données de deux échantillons de biére différents il établit selon la norme ISO 5725-1981. II sélectionne les données par l’analyses Cochran et Dixon. La répétabilité de la méthode est 0,13%, la reproductibilité est 0,25%