Abstract: A gas permeable membrane for the optical measurement of the partial pressure and/or the concentration of a gas species, the membrane comprises a porous light-transmissible membrane matrix containing a metal oxide, wherein the membrane matrix is at least partially charged with at least one gas-selective compound whose optical characteristics change upon an interaction with a corresponding gas species.

Abstract: The invention relates to a gas permeable membrane for the optical measurement of the partial pressure and/or the concentration of a gas species, the membrane comprises a porous light-transmissible membrane matrix containing a metal oxide wherein the membrane matrix is at least partially charged with at least one gas-selective compound whose optical characteristics change upon an interaction with a corresponding gas species. The average pore diameter of the pores of the membrane matrix ranges from 1 to 50 nanometers, the total pore volume from 1 to 30 mL/m2 and the metal oxide is pseudo-boehmite with the general formula AI2O3·n*H2O, wherein n ranges from 1 to 1.5, or an alumina oligomer. Further, the invention relates to the use of the membrane for the measurement of the presence, the partial pressure and/or the concentration of a gas, for example in cultivation flasks and bags, in gas atmospheres, incubators, medical devices, solutions, vapors and exhaust gases.

Abstract: A modular, in particular multidimensional system for the reagent-free, continuous detection of a substance is disclosed. The system is characterized by the presence of at least two measurements modules of preferably different types. The modules are robust and designed for a long-time operation. They have an exchangeable or replaceable selective layer structure. The system may also include appropriate modules for amperometry and optical sensors.

Abstract: Starting from two non-miscible phases, i.e., a lipophilic and a hydrophilic phase, a surface-active substance and a recognition component, a micellar recognition system is built in a suitable manner and is incorporated into a layer structure. The micellar recognition system is provided in a single thin layer in which the recognition component is distributed homogeneously. Additional layers which may be provided about this layer, have an influence on the properties of the entire layer structure. On contact between the layer structure and the substance to be measured a recognition step takes place in the layer which is followed by a transducing step. In this way a measurement variable is produced by means of which information is obtained on the substance. The layer structures exhibit higher sensitivity, a lower detection threshold, short response time and special robustness with regard to sample interference.

Abstract: Starting from two non-miscible phases, i.e., a lipophilic and a hydrophilic phase, a surface-active substance and a recognition component, a micellar recognition system is built in a suitable manner and is incorporated into a layer structure. The micellar recognition system is provided in a single thin layer in which the recognition component is distributed homogeneously. Additional layers which may be provided about this layer, have an influence on the properties of the entire layer structure. On contact between the layer structure and the substance to be measured a recognition step takes place in the layer which is followed by a transducing step. In this way a measurement variable is produced by means of which information is obtained on the substance. The layer structures exhibit higher sensitivity, a lower detection threshold, short response time and special robustness with regard to sample interference.