Abstract:
L'invention concerne l'utilisation d'un complexe métallique pour la détection et/ou la quantification de composés organophosphorés par colorimétrie. L'invention utilise un complexe métallique ayant la formule (I) suivante : (L) n -M m+ (A - ) m dans laquelle L est un ligand comprenant au moins un motif de formule (II) suivante : et dans laquelle X est choisi parmi OH, NH 2 et SH; n = 4 ou 6; m = 1 ou 2; M est choisi parmi Fe, Cu, Ni, Co, Ru, Os, Zn, Ir, Ag, Cd et Mn; A - est un contre ion choisi parmi Cl - , PF - 6 , ClO 4 - , BF 4 - , et Br - , pour la détection, par colorimétrie, de composés organophosphorés. L'invention trouve application dans le domaine de la détection et du dosage de molécules organophosphorées, en particulier organophosphates, en particulier utilisées comme gaz neurotoxique ou comme pesticides.
Abstract:
The present invention solves the technical problem of manufacturing process and design of optical chemical sensor, in which interaction of the indicator with the analyte allows quick and reliable spectrofluorimetric determination of organophosphates. The procedure for creation an optical chemical sensor with sol-gel membrane for detection of organophosphates, is characterized in that it begins with the preparation of the membrane so that the indicator C1, which is dissolved in ethanol (10 -7 M), add tetraethoxysilane (TEOS) and methyltriethoxysilane (MTriEOS) and stirr in an ultrasonic bath for 10 minutes; to then add the catalyst solution (0.001 M HCI) and mix again in an ultrasonic bath for 20 minutes; to make coatings on the glass slides after 24 h of sol aging in a closed container at room temperature and so that the slide is dipped in the sol and slowly pulled out from it, and let to dry for 24 hours at room temperature to form a membrane; to wipe coating on one side slides before drying.
Abstract:
A dangerous level of gas safety monitor for indicating a level of a target gas in an atmosphere comprising : a sol-gel layer comprising a first phosphorescent material, exposed to the atmosphere; a light source enabled to stimulate the phosphorescent material; a detector enabled to detect light emitted by the phosphorescent material;a pressure sensor to determine the pressure of the atmosphere; a processor enabled to determine relative phase shift or time delay between the detected light emitted by the phosphorescent material and the emitted light of the light source, wherein the monitor is configured to provide an output indicative of a dangerous level of the target gas in the atmosphere, the output based on the determined pressure and relative phase shift or time delay.
Abstract:
Nitric oxide probes comprising a compound represented by Formula, I, II, III, IV, V, VI or a combination thereof are provided. Methods of using these nitric oxide probes to detect nitric oxide are also provided.
Abstract:
The present invention discloses a thin reagent containing film sensor for detecting and measuring free chlorine in water, where components of the film sensor are a polymeric substrate that contains reactive material, an organic polyhydroxy compound, a reagent that creates an associated polymeric matrix, and an indicator; and a method for making the same. The film sensor can be formed to fit a specific dimension or shape. The film sensor swells or dissolves when exposed to aqueous solutions so that said reagent is released so that it can react with free chlorine, or the film sensor swells when exposed to aqueous solutions so that the aqueous solution diffuses into the film sensor and reacts with said reagent contained within the swollen film sensor.
Abstract:
Compositions for detection of chemical warfare agents that comprise oximate anion reactive sites and fluorophore cores. Methods for detecting a chemical warfare agents that comprise providing a detector molecule comprising an oximate anion reactive site and a fluorophore core and detecting fluorescence from the detector molecule. Methods for enhancing the reactivity of an oximate nucleophile that comprise introducing an oxime into an aprotic solvent and deprotonating the oxime to form the oximate nucleophile with a base that creates noncoordinating anions.
Abstract:
A method for identifying the redox activity of a subject compound is disclosed. The method can be performed aerobically and can include forming a mixture comprising a free-radical precursor and a compound to be tested, and converting the free-radical precursor into a free-radical anion and a free-radical cation. After the free radical cation and the free radical anion have been formed, the relative redox activity of the subject compound may cause a difference in the rate of photo-bleaching of the mixture and/or the rate of superoxide generation. These differences can be quantified and used to identify the redox activity of the subject compound. This sensitive technique for measuring redox activity can be used to screen compounds for various biological applications. Drugs also can be developed based on the relationship between redox activity and biological activity for particular biological applications.
Abstract:
This invention relates to a method suitable for detecting nitrogen mustard, sulphur mustard or a mixture of nitrogen and sulphur mustard in a sample solution comprising mixing the sample solution with a reagent wherein the reagent comprises 4-(4'-nitrobenzyl) pyridine or analogues thereof, and an additive selected from the group consisting of mercuric cyanide, a group I or group H metal perchlorate and mixtures thereof; gently warming the mixture; and adding a base. This invention also relates to the use of a kit comprising a reagent comprising 4-(4'-nitrobenzyl) pyridine or analogues thereof, and an additive selected from the group consisting of mercuric cyanide, a group I or group II metal perchlorate and mixtures thereof in such a method.
Abstract:
A substrate such as a porous tape coated with an adsorbent and impregnated with a processing solution which includes a silver salt, an organic acid such as benzenetricarboxylic acid or benzenesulfonic acid (with or without the addition of nitric acid) and a glycol is a sensitive detecting means for hydride gases and is stable upon exposure to light.