229results about "Investigating pH value" patented technology

In a sensor layer for quantitative determination of at least one chemical component in a gaseous or liquid sample medium containing a chromophore which is directly or indirectly responsive to the component being determined by changing its absorption spectrum, and a luminophore which is not responsive to the component being determined, where there is an at least partial overlap between the emission spectrum of the luminophore and the absorption spectrum of the chromophore, and where the energy transfer between luminophore and chromophore produces a measurable change in at least one luminescence characteristic of the luminophore, the luminophore L and the chromophore GAMMA are ionic substances with differing electrical charges, which are incorporated in a matrix material that is permeable to the chemical component being determined.

The present invention provides ratiometric fluorescent pH sensors for non-invasive, continuous monitoring of pH in such applications as fermentation processes. The ratiometric fluorescent pH sensors comprise a fluorescent dye that exhibits a shift in excitation wavelength with a corresponding shift in pH in the local environment of said fluorescent dye. Ratiometric measurements of the emission intensities at dual excitation maxima correlate to pH. Also provided is a fluorescent dye 6-methacryloyl-8-hydroxy-1,3-pyrene disulfonic acid (MA-HPDS). Further provided are systems and methods to non-invasively and continuously monitor pH.

A secretion-monitoring article for identifying a secreted biological fluid having a body with an absorbent material and least one pH determining member and a reagent associated with the absorbent material is disclosed. The article can be embodied as a swab, gauze, panty shield, hygienic napkin, diaper or interlabial absorbent structure and can be used to indicate the presence of amniotic fluid, or secretions associated with bacterial, parasite, fungal, or yeast infections without giving a false positive result upon exposure to urine. The present invention also teaches a pH indicator mixture and method of attaching the indicator to a substrate for use alone or integrated in an absorbent body and further teaches a method for monitoring the health condition of a person using the secretion-monitoring article.

A secretion-monitoring article for identifying a secreted biological fluid. The article includes a body with an absorbent material for absorbing a biological fluid secreted from a person and an indicator system. The indicator system includes an indicator agent and an ion-balance reagent, wherein the indicator system provides an indication of physiological conditions associated with the pH or the buffer capacities of the biological fluid, which indication is stable for at least 48 and preferably at least 72 hours. The article can be embodied as a swab, gauze, shield, hygienic napkin, diaper or interlabial absorbent structure and can be used to indicate the presence of amniotic fluid, or secretions associated with bacterial vaginosis without giving a false positive result upon exposure to urine or after drying.

An indicator system including two pH sensitive indicators and a reagent is disclosed. The indicator system can be integrated into a number of products such as sanitary napkins or panty shields and thus can indicate the presence of amniotic fluid or secretions associated with vaginosis without giving a false positive result upon exposure to urine.

A secretion-monitoring article for identifying a secreted biological fluid comprising a body with an absorbent material for absorbing a biological fluid secreted from a person and an indicator system. The indicator system comprises an indicator agent and an ion-balance reagent, wherein the indicator system provides an indication of physiological conditions associated with the pH or the buffer capacities of the biological fluid, which indication is stable for at least 48 hours, preferably at least 72 hours. The article can be embodied as a swab, gauze, shield, hygienic napkin, diaper or interlabial absorbent structure and can be used to indicate the presence of amniotic fluid, or secretions associated with bacterial vaginosis without giving a false positive result upon exposure to urine or drying out.

The present invention provides ratiometric fluorescent pH sensors for non-invasive, continuous monitoring of pH in such applications as fermentation processes. The ratiometric fluorescent pH sensors comprise a fluorescent dye that exhibits a shift in excitation wavelength with a corresponding shift in pH in the local environment of said fluorescent dye. Ratiometric measurements of the emission intensities at dual excitation maxima correlate to pH. Also provided is a fluorescent dye 6-methacryloyl-8-hydroxy-1,3-pyrene disulfonic acid (MA-HPDS). Further provided are systems and methods to non-invasively and continuously monitor pH.

A method for identifying physiological conditions associated with the pH or the buffer capacities of biological fluid secreted from a person, by providing a secretion-monitoring article of a body that includes an absorbent material for absorbing a biological fluid secreted from a person and an indicator system having a hydrophobic chemical composition that includes an indicator agent and an ion-balance reagent, at specific relative amounts. Optionally, a competitive agent for establishing a pre-set threshold of an analyte of interest in a tested bodily fluid, is added to the indicator system, wherein the indicator reagent being charged oppositely to the analyte of interest and the competitive reagent having the same charge as the indicator reagent.

A method for identifying physiological conditions associated with the pH or the buffer capacities of biological fluid secreted from a person, by providing a secretion-monitoring article of a body that includes an absorbent material for absorbing a biological fluid secreted from a person and an indicator system having a hydrophobic chemical composition that includes an indicator agent and an ion-balance reagent, at specific relative amounts. Optionally, a competitive agent for establishing a pre-set threshold of an analyte of interest in a tested bodily fluid, is added to the indicator system, wherein the indicator reagent being charged oppositely to the analyte of interest and the competitive reagent having the same charge as the indicator reagent.

A water monitoring device monitors and maintains swimming pool chemistry. The device includes sensors that detect water chemistry. The water monitoring device can communicate with computers and servers. This system can be used to determine if corrections to the water chemistry are required to maintain water sanitation. The device can monitor: pH, air temperature, water temperature, free chlorine levels, oxidation reduction potential, alkalinity, oxygen demand, water movement and velocity, and electrical conductivity.

A new stable and reversible planar pH fluorosensor is prepared by conjugating a pH sensitive fluorescent material to a water-soluble polymer chain attached to a support. The invention also provides for a thin-film standard pH apparatus.

Particular aspects provide novel devices and methods for accurately measuring total ammonia (NH3 plus NH4+) in a solution (e.g., freshwater and saltwater) by spatially proximate, simultaneous and continuous quantitative measurement of solution pH and ammonia. The devices overcome prior art inaccuracies relating to non-homogeneous sampling, and to spatial, temporal and thermal sampling discontinuities. Particular embodiments provide a combination pH and ammonia measuring device, comprising: a submersible member; a submersible non-bleeding ammonia-sensing portion attached to the submersible member and suitable to provide for a continuous visual indicator of solution ammonia concentration; a submersible non-bleeding pH-sensing portion attached to the submersible member and suitable to provide for a continuous visual indicator of solution pH; visual ammonia and pH indicator comparison means suitable for comparative quantitative determination of solution ammonia concentration and pH. Additional aspects provide novel ultra-sensitive devices and methods using same for measuring ammonia in air or solution.

The present invention relates to devices, methods, and kits for quickly and easily measuring and monitoring the pH of aquatic environments, such as lakes, streams, drinking waters, fisheries, aquariums, pools, hot-tubs, and spas. The current invention includes devices that are reusable and capable of monitoring the pH in a reversible fashion, thereby allowing continuous pH sensing without a need for the user to physically perform pH tests. Operation of the invention involves placing the device into the aquatic environment and optically detecting a color change in the membrane, for example, by looking at the device, when a pH measurement is desired. In addition, the device is both inexpensive and reusable, allowing the user to monitor the pH of various aquatic environment at minimal costs.

The invention provides a method and apparatus for determining the amount of various materials in a liquid sample. Because the apparatus is particularly resilient it can be used repeatedly with very harsh liquid samples such as boot water from an oil refinery. The apparatus uses at least one volume and / or concentration independent optical analysis method to determine at least one of: the pH, amount of chloride, and / or amount of iron in the sample. The optical property can be colorimetric, fluorescent or both and result from adding dyes, complexing agents, turbidity inducing compounds, and other optically effecting reagents to the sample. Because the measurements are concentration and volume independent they can be done continuously, quickly, and avoid the inconvenient start and stop procedures in prior art measurement regimens. The method further includes using a BDD cell to oxidize materials (such as sulfoxy compounds) that would otherwise interfere with the optical analysis and / or to sparge the sample with gas.

Particular aspects provide novel devices and methods for accurately measuring total ammonia (NH3 plus NH4+) in a solution (e.g., freshwater and saltwater) by spatially proximate, simultaneous and continuous quantitative measurement of solution pH and ammonia. The devices overcome prior art inaccuracies relating to non-homogeneous sampling, and to spatial, temporal and thermal sampling discontinuities. Particular embodiments provide a combination pH and ammonia measuring device, comprising: a submersible member; a submersible non-bleeding ammonia-sensing portion attached to the submersible member and suitable to provide for a continuous visual indicator of solution ammonia concentration; a submersible non-bleeding pH-sensing portion attached to the submersible member and suitable to provide for a continuous visual indicator of solution pH; visual ammonia and pH indicator comparison means suitable for comparative quantitative determination of solution ammonia concentration and pH. Additional aspects provide novel ultra-sensitive devices and methods using same for measuring ammonia in air or solution.

An indicator system including two pH sensitive indicators and a reagent is disclosed. The indicator system can be integrated into a number of products such as sanitary napkins or panty shields and thus can indicate the presence of amniotic fluid or secretions associated with vaginosis without giving a false positive result upon exposure to urine.

An optical sensor for pH is described using a cross-linked network of bisilanes to immobilize a pH sensitive chromophore to a surface potentially exposed to a high pressure, high temperature environment such as wellbore effluents at a downhole location.

The present disclosure provides methods for detection and quantification of trimethylamine (TMA) or trimethylamine oxide (TMAO) comprising passing a sample over a sensor comprising a substrate having a plurality of chemically responsive dyes selected from the following classes of chemically responsive dyes: metal-containing dyes, pH indicators, or solvatochromic / vapochromic dyes. The disclosure also provides devices and sensors for the detection and quantification of TMA, and methods of diagnosing a subject having trimethylaminuria (TMAU).

The invention concerns an ink composition comprising an oxidizing and reducing agent and / or pH colorant as the dye, polymeric material as the binder, as well as a pH adjuster and volatile solvent. Further, the invention concerns a method for manufacturing an oxygen and / or pH indicator, in which the ink composition is printed and reduced, or reduced using a volatile reducer and printed; an oxygen and / or pH indicator manufactured by the method, as well as a package for stating a leakage, a change caused by oxygen content and / or deterioration of a product.

The invention relates to a portable paper chip capable of visually detecting the chlorine ion content in sweat. The portable paper chip is provided with paper which can generate color or fluorescence changes according to the pH and a double-layer structure of anion exchange paper which is arranged on the lower surface of the paper. The invention also relates to a method for visually detecting the chlorine ion content in sweat by using the paper chip and applications of the paper chip for physiological status monitoring and diagnosis of cystic fibrosis diseases.

A high-resolution in situ sensing system and method for providing continuous measurements of at least one dissolved gas including a sample liquid processing cell having at least a first conduit defining a first passage with at least one gas-permeable wall capable of passing the at least one pre-selected dissolved gas from the sample liquid into a reagent fluid. The at least one gas-permeable wall substantially resists flow of the sample liquid therethrough. Reagent fluid is directed through the first conduit while moving the sample liquid and the reagent fluid relative to each other in one of a concurrent and a countercurrent flow relationship to achieve either partial or full equilibration between the sample liquid and reagent fluid to generate at least partially equilibrated reagent fluid in a substantially continuous manner.

A new stable and reversible planar pH fluorosensor is prepared by conjugating a pH sensitive fluorescent material to a water soluble polymer chain attached to a support.

The present invention relates to an optical fluorescence dual sensor comprising a probe for sensing pH, a probe for sensing oxygen, an intra-reference probe and a matrix. The present invention also relates to methods of preparing an optical fluorescence dual sensor and methods of using them.

The present invention relates to a color-changing material and to a multiple-component material that includes a color-changing composition. The color-changing materials and color-changing compositions are capable of changing color in order to indicate a change in condition, such as a change in pH. The color-changing materials and color-changing compositions include a hydrogel-forming composition, a charged colorant and a pH adjuster. The hydrogel-forming composition includes at least one charged species.

Provided is a pen type of apparatus for measuring multiple water qualities, which is capable of measuring acidity (pH) and electric conductivity (EC) without interfering with each other in agricultural water for hydroponic cultivation to easily confirm the measured results.

In one aspect, methods of sensing are described herein. In some embodiments, a method of sensing comprises disposing a fluorophore in a biological environment, wherein the fluorophore comprises a dioxo-pyridine ring (DPR) or a thiazolopyridine acid (TPA). The method further comprises exposing the biological environment to electromagnetic radiation having a wavelength corresponding to an excitation wavelength of the fluorophore, detecting light emitted by the fluorophore, and correlating the light emitted by the fluorophore to a presence or absence of an analyte within the biological environment in an amount above a minimum detection threshold. The presence of the analyte can increase or decrease the amount of light emitted by the fluorophore. The presence of the analyte may also shift the peak emission wavelength or alter the fluorescence lifetime of the fluorophore. The analyte, in some embodiments, comprises hydrogen ions, halide ions, and / or halogens.

An organic electro-luminescent display device according to an embodiment of the present invention includes a thin film transistor substrate including a base member; an organic material layer disposed on the base member in a display area and held between a lower electrode and an upper electrode; a dam formed on the base member in an external area surrounding the display area; and a sealing layer formed on the organic material layer, the sealing layer covering the display area, the sealing layer including a sealing planarization film formed of organic material and formed in an area surrounded by the dam, the sealing layer further including a sealing film formed of inorganic material and covering the dam. The dam includes moisture detection member.

A poly(arylene ether)-containing resin composition or article may be authenticated by a method that includes at least partially extracting a pH sensitive compound from the resin composition or the article with a solvent, wherein the resin composition or the article includes a poly(arylene ether) and the pH sensitive compound; mixing the solvent having the extracted pH sensitive compound with an acidic solution or a basic solution to form an observation mixture; and observing the observation mixture to determine if a predetermined color change occurred in the observation mixture.

A sensor device includes first and second electrodes, a coating film and a functional element. The first electrode includes a first metallic material in which either a first passivation film forms on a surface thereof or the first passivation film present on the surface thereof is lost, in association with changes in the pH of a measurement site. The second electrode includes a second metallic material different from the first metallic material, and is spaced apart from the first electrode. The coating film includes a third metallic material different from the first and second metallic materials. The coating film covers at least the first or second electrode. The functional element is configured to measure a difference in electric potential between the first and second electrodes that changes depending on presence or absence of each of the first passivation film and the coating film in association with the changes in pH.