Quantifying nanobubbles in solution includes combining an indicator with a fluid comprising nanobubbles to yield a first solution, bursting the nanobubbles in the first solution to yield a second solution, and assessing a difference between the first solution and the second solution to yield a concentration of the nanobubbles in the first solution, a concentration of reactive oxygen species in the first solution or the second solution, or both.

An implement for eliminating headspace in the testing space(s) (T.sub.9 or MP.sub.Well) of a test tube (T) or microtiter plate (MP), and methods of using such implements to measure oxygen concentration in a test sample. The implement projects into a test chamber (T.sub.9 or MP.sub.Well) to displace a portion of a fluid sample within the test chamber (T.sub.9 or MP.sub.Well) and has longitudinally extending grooves (109 and 229) through which the displaced fluidic content can be discharged from the test chamber (T.sub.9 or MP.sub.Well).

The invention relates to a luminescence-based colorimetric sensor formulation and method of use thereof. The sensor formulation can be used to assess oxygen concentration, particularly in controlled oxygen atmospheres such as food packaging. In embodiments, the invention also relates to sensor-containing laminate films for food packaging, and methods of their preparation.

An implement for eliminating headspace in the testing space(s) (T.sub.9 or MP.sub.Well) of a test tube (T) or microtiter plate (MP), and methods of using such implements to measure oxygen concentration in a test sample. The implement projects into a test chamber (T.sub.9 or MP.sub.Well) to displace a portion of a fluid sample within the test chamber (T.sub.9 or MP.sub.Well) and has longitudinally extending grooves (109 and 229) through which the displaced fluidic content can be discharged from the test chamber (T.sub.9 or MP.sub.Well).

The oxygen detecting agent composition according to the present invention includes a redox dye, a reducing agent and a basic substance, wherein the redox dye is an iron blue pigment and the reducing agent is lactose.

Methods and systems are disclosed for analyzing and treating a fluid containing a peroxyacid and/or peroxide. A method of analyzing the fluid includes introducing into the fluid a decomposition agent that catalyzes decomposition of the peroxyacid and/or peroxide into decomposition products including oxygen, then directly or indirectly measuring an amount of oxygen produced after introduction of the decomposition agent, and determining an amount of the peroxyacid and/or peroxide present in the fluid. The amount of peroxyacid and/or peroxide in the fluid can also be monitored and controlled by further adjusting the amount of the peroxyacid and/or peroxide in the fluid based on the determined amount thereof. A system for performing the methods includes a decomposition agent infusion device for introducing the decomposition agent into a fluid sample, and a sensor for directly or indirectly measuring an amount of oxygen produced after introduction of the decomposition agent.

The present disclosure relates to a device in particular, a sensor for determining a measurand correlated with a concentration of an analyte in a measuring medium, including a housing that has a region provided for contacting the measuring medium, a fluid line arranged in the housing, an interface that is arranged within the region provided for contacting the measuring medium and has a first side which is in contact with the fluid line and a second side which is in contact with an environment of the housing in particular, with the measuring medium in contact with the housing, a first reservoir that is arranged in the housing and fluidically connected to the fluid line and which contains a reagent intended for contacting and/or interacting with the analyte, and a transport mechanism that is designed to transport reagent from the first reservoir into the fluid line.

The present application discloses a sensor for determining a measurand correlated with a concentration of at least one analyte belonging to the class of reactive oxygen species in a measuring fluid, the sensor including a sensor element having an indicator substance, wherein the indicator substance is oxidized into an oxidized form of the indicator substance by the at least one analyte, a means for generating a flow of current in the sensor element that causes a reduction of the oxidized form of the indicator substance and thereby regeneration of the indicator substance, an optical measuring sensor to detect measuring radiation influenced by the oxidized form of the indicator substance and to generate an electrical measuring signal using the influenced measuring radiation, and a sensor switch connected to the optical measuring sensor to receive the measuring signal and to ascertain a measured value of the measurand using the measuring signal.

An aspect of the disclosure is a diagnostic system. The diagnostic system includes a communications interface, an output gas interface, one or more sensors, and a controller that is configured to execute a diagnostic procedure. The diagnostic procedure causes the controller to transmit one or more commands to the oxygen concentrator using the communications interface, to obtain the one or more gas property measurements from the one or more sensors during operation of the oxygen concentrator, and to determine a diagnostic result by comparing the one or more gas property measurements obtained from the one or more sensors during operation of the oxygen concentrator to a testing standard described by the diagnostic procedure. The diagnostic procedure also causes the controller to output information regarding the diagnostic result for display to a user.

The invention relates to a method for measuring the concentration of a gas component in an atmosphere of a packaging which is made from a plastic film and which comprises a gas concentration indicator substance on the side of the plastic film facing the atmosphere.