1485 results about "Scavenger" patented technology

Dendritic polymers with enhanced amplification and interior functionality are disclosed. These dendritic polymers are made by use of fast, reactive ring-opening chemistry (or other fast reactions) combined with the use of branch cell reagents in a controlled way to rapidly and precisely build dendritic structures, generation by generation, with cleaner chemistry, often single products, lower excesses of reagents, lower levels of dilution, higher capacity method, more easily scaled to commercial dimensions, new ranges of materials, and lower cost. The dendritic compositions prepared have novel internal functionality, greater stability (e.g., thermal stability and less or no reverse Michael's reaction), and reach encapsulation surface densities at lower generations. Unexpectedly, these reactions of polyfunctional branch cell reagents with polyfunctional cores do not create cross-linked materials. Such dendritic polymers are useful as demulsifiers for oil/water emulsions, wet strength agents in the manufacture of paper, proton scavengers, polymers, nanoscale monomers, calibration standards for electron microscopy, making size selective membranes, and agents for modifying viscosity in aqueous formulations such as paint. When these dendritic polymers have a carried material associated with their surface and/or interior, then these dendritic polymers have additional properties for carrying materials due to the unique characteristics of the dendritic polymer, such as for drug delivery, transfection, and diagnostics.

A corrosion control system is disclosed including an anionic oxygen inhibitor, a cationic acid inhibitor or dispersant, and a noxious species inhibitor or scavenger for use in a fluid in contact with a metallic surface at low temperature, moderate temperature and especially at high temperature. A drilling fluid, a completion fluid, a production fluid and a geothermal fluid including an effective amount of the corrosion control system is also disclosed as well as methods for making and using same.

Compositions comprising a blend of two or more paper strengthening agents have improved stability compared with previously known paper strengthening agents. One component is a polymeric paper strengthening agent, preferably a wet strengthening agent. The other component is a stabilized polyacrylamide prepared by (1) reacting a first portion of glyoxal with a polyacrylamide having pendant amide groups to form a first reaction mixture comprising polyacrylamide; (2) adding an acid to the first reaction mixture to form a second reaction mixture having a reduced pH and comprising the polyacrylamide; and (3) adding a second portion of glyoxal to the second reaction mixture to form the stabilized polyacrylamide. If desired, an aldehyde scavenger can be included in one or more of step (1), step (2), step (3), or the stabilized polyacrylamide. Such compositions can be used to enhance the strength of paper, particularly the wet strength of paper.

A significant problem in PEM fuel cell durability is in premature failure of the ion-exchange membrane and in particular by the degradation of the ion-exchange membrane by reactive hydrogen peroxide species. Such degradation can be reduced or eliminated by the presence of an additive in the anode, cathode or ion-exchange membrane. The additive may be a radical scavenger, a membrane cross-linker, a hydrogen peroxide decomposition catalyst and/or a hydrogen peroxide stabilizer. The presence of the additive in the membrane electrode assembly (MEA) may however result in reduced performance of the PEM fuel cell. Accordingly, it may be desirable to restrict the location of the additive to locations of increased susceptibility to membrane degradation such as the inlet and/or outlet regions of the MEA.

Disclosed herein is a method of preparing a ¹⁸⁸Re-tricarbonyl complex for radiopharmaceutical use and of preparing a precursor thereof, and a contrast agent using the same. Particularly, this invention provides a method of preparing a ¹⁸⁸Re-tricarbonyl precursor by reacting perrhenate with borane-ammonia (BH₃.NH₃), potassium boranocarbonate (K₂[H₃BCO₂]) and phosphate in the presence of borohydride exchange resin as a reducing agent, and a method of preparing a ¹⁸⁸Re-tricarbonyl complex by reacting the ¹⁸⁸Re-tricarbonyl precursor with a ligand. According to the method of this invention, the borohydride exchange resin is used as a reducing agent and as an anion scavenger, thereby obtaining the ¹⁸⁸Re-tricarbonyl precursor and complex having high radiolabeling yield and high purity. In addition, the ¹⁸⁸Re-tricarbonyl complex can be used as a contrast agent having excellent plasma stability.

The present invention is generally related to the discovery of the therapeutic benefit of administering gamma-tocopherol and gamma-tocopherol derivatives. More specifically, the use of gamma-tocopherol and racemic LLU-alpha, (S)-LLU-alpha, or gamma-tocopherol derivatives as antioxidants and nitrogen oxide scavengers which treat and prevent high blood pressure, thromboembolic disease, cardiovascular disease, cancer, natriuretic disease, the formation of neuropathological lesions, and a reduced immune system response are disclosed.

Fabric care compositions comprising formaldehyde scavengers exhibit low levels of free formaldehyde.

An apparatus for administering a therapeutic agent is provided. The apparatus, in an embodiment, includes an ozone generator connected to a scavenger and an ozone administrator via network of tubing and valves. When activated and the valves placed in the proper position, the ozone generator will fill the ozone administrator with ozone. The ozone generator can then be turned off and the valves moved so that the administrator can be disconnected from the remainder of the apparatus. The administrator is typically in the form of a syringe and needle. Once the syringe and needle is filled with ozone, the needle can be inserted into a tissue and the ozone expressed therefrom into the tissue. Various other apparatuses and methods are also contemplated.

The present invention relates to compositions and methods for providing mitochondria-selective targeting agents covalently linked to desired cargo such as radical scavenging agents. Compositions and methods are disclosed for treating an illness that is caused or associated with cellular damage or dysfunction which is caused by excessive mitochondrial production of reaction oxygen species (ROS). Compositions which act as mitochondria-selective targeting agents using specific structural signaling features recognizable by cells as mitochondrial targeting sequences are discussed. A method for delivering these agents effectively into cells and mitochondria where they act as electron scavengers by way of certain targeting sequences is also disclosed. Mitochondria and cell death by way of apoptosis is inhibited as a result of the ROS-scavenging activity, thereby increasing the survival rate of the patient. In a preferred embodiment, the compositions and methods may be administered therapeutically in the field to patients with profound hemorrhagic shock so that survival could be prolonged until it is feasible to obtain surgical control of the bleeding vessels. In further preferred embodiments, the composition for scavenging radicals in a mitochondrial membrane includes a radical scavenging agent and a membrane active compound having a high affinity with said mitochondrial membrane and associated methods. In another embodiment, the cargo transported by mitochondrial-selective targeting agents may include an inhibitor of nitrous oxide system (NOS) enzyme activity.

Compositions and methods are disclosed for treating an illness that is caused or associated with cellular damage or dysfunction which is caused by excessive mitochondrial production of reaction oxygen species (ROS). Compositions which act as mitochondria-selective targeting agents using specific structural signaling features recognizable by cells as mitochondrial targeting sequences are discussed. A method for delivering these agents effectively into cells and mitochondria where they act as electron scavengers by way of certain targeting sequences is also disclosed. Mitochondria dysfunction and cell death by way of apoptosis is inhibited as a result of the ROS-scavenging activity, thereby increasing the survival rate of the patient. In a preferred embodiment, the compositions and methods may be administered therapeutically in the field to patients with profound hemorrhagic shock so that survival could be prolonged until it is feasible to obtain surgical control of the bleeding vessels.

A method for making a storage-stable glyoxalated polyacrylamide composition suitable for use as a strengthening agent for paper in which the glyoxal is added to the base polyacrylamide polymer in two portions and a scavenger for aldehyde groups is used.

A method includes providing an article including an oxygen scavenger; forming the article into a container; placing an oxygen sensitive product into the container; and exposing the container to actinic radiation at a dosage effective to sterilize the container, and trigger the oxygen scavenger in the article. Alternative methods are also disclosed. A package includes a container, the container including an activated oxygen scavenger; wherein the container is sterilized; and wherein an oxygen sensitive product is disposed in the container.

A gravity fed carbon block water filter includes activated carbon particles; a binder material interspersed with the activated carbon particles; and a lead scavenger coupled to at least one of the activated carbon particles and binder material, the lead scavenger being for removing lead from water, where a lead concentration in a final liter of effluent water filtered by the filter is less than about 10 μg/liter after about 151 liters (40 gallons) of source water filtration, the source water having a pH of 8.5 and containing 135-165 parts per billion total lead with 30-60 parts per billion thereof being colloidal lead greater than 0.1 μm in diameter, and where the water has an average flow rate of at least 0.1 liter per minute through the filter with a head pressure of between approximately 0.1 and 1.0 psi.

Disclosed is a combination of hydrofluoroolefins and/or hydrochlorofluoroolefins with stabilizers wherein the stabilizers minimize the degradation of the hydrofluoroolefins and hydrochlorofluoroolefins during storage, handling and use yet allow for atmospheric degradation. The combinations exhibit low or zero ozone depletion potential and lower global warming potential making them of interest as replacements for chlorofluorocarbons and hydrfluorocarbons. The combinations of the present invention comprise hydrofluoroolefins and/or hydrochlorofluoroolefins in combination with a stabilizer or stabilizers selected from free radical scavengers, acid scavengers, oxygen scavengers, polymerization inhibitors and combinations thereof.

A multi-barrier filter comprising a halogenated resin capable of removing contaminants from a fluid, and at least one contaminant sorbent medium downstream of the halogenated resin capable of adsorbing or absorbing contaminants. The at least one contaminant sorbent medium is preferably “halogen-neutral” to maximize the antimicrobial effectiveness of the halogen in the fluid. The filter may comprise at least one “halogen-scavenger” barrier downstream of the halogen-neutral barrier. Because of the efficiency of the filter, a low-residual halogenated resin, such as, for example, low residual iodinated resin, may be used.