摘要:
Sodium ion selective compositions which comprise an ion carrier, a compound capable of solvating the ion carrier, and a supporting matrix are disclosed.The ion carriers of this invention are hemispherand compounds represented by the formula ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4 are independently hydrogen, alkyl, alkenyl, cycloalkyl, aryl or a heterocyclic group and R represents Z-decyl, Z-octyl, 3-octyl, and cyclohexyl methyl.
摘要:
Ion-selective compositions which comprise an ion carrier, a compound capable of solvating the ion carrier, and a supporting matrix are disclosed.The ion carriers of this invention are hemispherand compounds represented by the formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are independently hydrogen, alkyl, alkenyl, cycloalkyl, aryl or a heterocyclic group; and X is benzyl or an electron donating group capable of forming at least one coordinating site for sodium ions. A preferred hemispherand according to this invention is 2'-benzyloxy-3,3"-[2,6-pyridylenebis(methyleneoxymethylene)]-2,2"-tetramethylenedioxy-5,5',5"-trimethyl-1,1':3',1"-terphenyl. These compounds and the compositions containing same are particularly useful in ion-selective electrodes. Such an electrode is capable of selectively transporting sodium ions in preference to other cations. Dry-operative electrodes using these ion-selective compositions as membranes are also disclosed.
摘要:
Ion-selective compositions which comprise an ion carrier, a compound capable of solvating the ion carrier, and a supporting matrix are disclosed. The ion carrier according to the invention is a lipophilic hemispherand compound. These compositions are particularly useful in ion-selective electrodes. Such an electrode is capable of selectively transporting a first ion in preference to a second ion. Particularly useful hemispherands have a .DELTA.G of complexation with the first ion which is at least 0.3 Kcal/mole greater than the .DELTA.G of complexation with the second ion. Dry-operative electrodes using these ion-selective compositions as membranes are also disclosed.
摘要:
Ion-selective compositions which comprise an ion carrier, a compound capable of solvating the ion carrier, and a supporting matrix are disclosed. The ion carrier useful in this invention is a hemispherand compound represented by the structure: ##STR1## wherein X.sub.1, X.sub.2, X.sub.3 and X.sub.4 are independently alkyl or alkenyl, or any one of X.sub.1, X.sub.2, X.sub.3 and X.sub.4 is taken with one of the others of X.sub.1, X.sub.2, X.sub.3 and X.sub.4 to form an alkylene group or an alkylene group interrupted with hetero atoms; and R represents the atoms necessary to complete a macrocyclic ring structure having from 16 to 19 atoms in the backbone of the ring structure, with the proviso that R contains (a) at least one coordinating site for sodium ions and (b) at least two alkylene groups as part of the ring structure. These compounds and the compositions containing same are particularly useful in ion-selective electrodes. Such an electrode is capable of selectively transporting sodium ion in preference to other cations. Dry-operative electrodes using these ion-selective compositions as membranes are also disclosed.
摘要:
A method and multilayer analytical element for the determination of catechol and catechol generating substances such as salicylate is described. A series of enzymatic conversions involving tyrosinase is used to convert catechol to o-quinone and the latter to convert a leuco dye to a colored dye.
摘要:
A method for accelerating the process of removing ethanol from the blood through the use of certain additives that accelerate the metabolic oxidation of ethanol, and others which in addition act as catalysts or “pseudo” enzymes for the oxidation. These additives include multivalent transition metal ions, as well as complexes thereof, and NAD+ which enhance the oxidation reaction. The method described can act as a sobriety inducer and/or as an effective palliative for the unpleasant effects of overuse of ethanol.
摘要:
Potassium ion-selective compositions which comprise valinomycin and a particular carrier solvent capable of solvating valinomycin are disclosed. The carrier solvent is a dicarboxylic acid diester having at least 25 carbon atoms, a viscosity of less than about 120 centipoise at 20.degree. C. and a boiling point greater than about 170.degree. C. at 5 mm pressure. A preferred carrier solvent is diisodecyl phthalate. Membranes prepared from these compositions preferably have a glass transition temperature greater than about -50.degree. C. These membranes are particularly useful in dry-operative potassium ion-selective electrodes which are capable of selectively determining potassium ions in preference to other ions.
摘要:
A battery charger 10 includes a capacitor 20 which establishes a level of current sufficient to fast charge in one-hour a battery 18 having from one to twenty cells. An SCR 16 is controlled by a timer 42 to initially delay the supply of current while determining whether the battery 18 is hot or cool. If battery 18 is cool, charger 10 proceeds to fast charge the battery. After battery 18 is fully charged, the battery heats to a temperature where a NTC thermistor 58 responds to trigger a second timer 52 which controls SCR 16 to stop the fast charging operation. Charger 10 is then controlled to prevent the charger from thereafter re-entering a fast charge mode.If battery 18 is initially hot, charger 10 is controlled to further delay the initiation of a fast charge operation until the battery cools to or below the charge-start temperature.A second NTC thermistor 90 is provided to compensate for the potential effect on the operation of thermistor 58 in response to temperature levels emanating from any environment other than from battery 18.
摘要:
An analytical composition, electrode and method are useful for the detection of lithium ions in an aqueous liquid. The lithium ion-selective composition comprises a lipophilic group-substituted 1,10-phenanthroline, a compound capable of solvating the phenanthroline, and a supporting matrix. This composition can be used in a lithium ion-selective electrode as a lithium ion-selective membrane. The electrode can also comprise an internal reference electrode.
摘要:
A particular class of triarylmethane leuco dyes are useful in analytical compositions, elements and methods. These leuco dyes are triarylmethane compounds having an aromatic heterocyclic moiety attached to the central methane carbon and which, upon interaction with hydrogen peroxide, provide dyes having a maximum absorption at a wavelength equal to or greater than about 600 nm. Particularly useful leuco dyes have the structure: ##STR1## wherein R is a 5- to 15-membered aromatic heterocyclic moiety; and R' and R" are independently open chain or cyclic amines. These compounds are useful for providing detectable dyes in compositions and elements useful for detection of hydrogen peroxide or other analytes which react to produce hydrogen peroxide in aqueous liquids, e.g. biological fluids.