Abstract: A water-insoluble copolymer which is composed of (a) from 39.9 to 60% by weight of N,N-dimethylacrylamide or N,N-dimethylmethacrylamide; (b) from 60 to 39.9% by weight of N-alkylated acryl amides or N-alkylated methacryl amides; (c) from 0.1 to 0.7% by weight of a proton-sensitive fluorophore which is covalently bonded to the copolymer; and (d) from 0 to 20% by weight of a diolefinic crosslinking component. The copolymer is used in the form of a membrane on a transparent support material as an optical sensor for ionic strength-independent pH value determination.

Abstract: The invention relates to a polymer composition comprising pH-sensitive fluorescent dyes, to an ionic strength-independent optical sensor for pH value determination that contains the composition in the form of a membrane on a transparent support material, and to an optical process, according to the fluorescence method, that renders possible highly accurate pH value determination independently of the ionic strength of the test solution. The process is especially suitable for the determination of the pH value of physiological solutions, especially for the determination of the pH value of blood.

Abstract: A water-insoluble copolymer which is composed of (a) from 39.9 to 60% by weight of N,N-dimethylacrylamide or N,N-dimethylmethacrylamide; (b) from 60 to 39.9% by weight of N-alkylated acryl amides or N-alkylated methacryl amides; (c) from 0.1 to 0.7% by weight of a proton-sensitive fluorophore which is covalently bonded to the copolymer; and (d) from 0 to 20% by weight of a diolefinic crosslinking component. The copolymer is used in the form of a membrane on a transparent support material as an optical sensor for ionic strength-independent pH value determination.

Abstract: A method for the independent, reversible, optical determination of the pH value and the ionic strength of an aqueous sample with the aid of two different sensors in accordance with the fluorescence method, in which method two optical sensors, which are each composed of polymers of different structure but each contain the same fluorescent dye and which each consist of a coated material composed ofa) a carrier material, to which there is appliedb) at least one water-insoluble layer of a polymer comprising at least one hydrophilic monomer (A) from the group of substituted olefins, andc) a proton-sensitive fluorescent dye which is bonded directly or via a bridge group to the spine of polymer b) or which is incorporated in polymer b),are brought into contact with an aqueous test sample, irradiated with exciting light, the fluorescence is measured and the pH values and the ionic strengths are calculated from the measured fluorescence intensities with reference to calibration curves.

Abstract: The invention is directed to compositions containing at least one olefinic monomer, at least one polymer prepared form an olefinic monomer, an indicator dye to the basic structure of which an olefinic polymerisable group is covalently bonded directly or via a bridge group, at least one diolefinic cross-linking agent, and an effective amount of a polymerisation initiator; to polymerisates of the compositions, the polymerisates being in the form of interpenetrating networks; to membranes and unsupported films prepared from the polymerisates; to carrier materials coated with the compositions and polymerisates; to optical sensors prepared from the polymerisates; and to methods of determining ions and/or gases in solutions and/or blood.

Abstract: In the optical detection device (1), the excitation light guide (11) and the emission light guide (12) form a structural unit having the end face (14) facing the fluorescence changer (4). The end face (14) physically corresponds substantially to one of the boundary surfaces of the two light guides (11, 12). As a result, the detection device (1) can be separated in a simple manner into an optical part and a mechanical part which are in optical contact only by way of the end face (14). All of the elements in the optical light path are connected in a mechanically stable manner by means of the index-matching medium 20, as a result of which the light between the light source (10) and the photoelectric sensor (13) propagates only in media having a comparable refractive index. The light source (10) is preferably a light-emitting diode.