Abstract:
Purification of poly-amino acid-tagged recombinant proteins has been improved by the use of a carboxymethylated aspartate ligand complexed with a third-block transition metal having an oxidation state of 2+ and a coordination number of 6. A method for synthesizing the metal ion-CM-Asp complex is also described. Further, the metal ion-CM-Asp complex can be used for screening protein function.
Abstract:
The present invention provides halogenated calixpyrrole, calixpyridinopyrrole, and calixpyridine macrocycles having 4–12 pyrrolic rings with greater stability, enhanced anion and neutral molecule binding affinity, and different binding selectivites as compared to their non-halogenated congeners as judged from 1H NMR, 19F NMR and fluorescence emission spectroscopic analyses.
Abstract translation:本发明提供了与其非卤化同源物相比,具有4-12个具有更大稳定性,增强的阴离子和中性分子结合亲和力的吡咯环的卤化杯芳吡咯,杯状吡啶并吡咯大环化合物, 1 H NMR,19 F NMR和荧光发射光谱分析。
Abstract:
A silica-polyamine based extraction material removes selected transition metal ions from solution in the presence of iron ions. The silica-polyamine base is a reaction product of a polyamine and a covalently anchored trifunctional hydrocarbylsilyl that yields non-crosslinked amino groups to which pyridine function group is attached. The extraction material is particularly useful in selectively removing copper from low concentration, low pH leach solutions separating copper from ferric iron or chloride ions. The product is a durable, high capacity extraction material that selectively captures copper at high flow rates and releases that copper into highly concentrated solutions.
Abstract:
The present invention relates to a method of generating at least one polydentate metal chelating affinity ligand, which method comprises the steps of (a) providing at least one cyclic scaffold comprising a carbonyl, an adjacent sulphur and a nucleophile; (b) providing at least one polydentate metal chelating affinity ligand arm, optionally in a form wherein the metal chelating functionalities are protected, on each scaffold by derivatisation of the nucleophile of said scaffolds, while retaining the cyclic structure of the scaffold; (c) ring-opening at the bond between the carbonyl and the sulphur of the derivatised scaffold by adding a reagent that adds one or more metal chelating affinity ligand arms to the scaffold; and, if required, (d) deprotecting the functionalities of the ligand arm(s) provided in step (b). In the most preferred embodiment of the method, steps (c) and (d) are performed simultaneously as one single step.
Abstract:
The invention relates to per(3,6-anhydro)cyclodextrin derivatives containing in C2 at least one carbamate group, polymers thereof, their preparation and their use for separating contaminating anions such as the anions CrO42−, Cr2O72− or MnO42−.
Abstract:
A polymer substrate for recombinant protein purification is provided. A process for purifying recombinant proteins is also provided. In general, the present invention is directed to a chelating composition which may be used in a self-supported purification medium for recombinant protein purification. In another embodiment, a process for removal of transition metals from environmental waste is also provided.
Abstract:
One embodiment of the invention comprises an ion exchange composition formed by reacting unsaturated carbon to carbon moieties pendant from derivatized ion binding cryptands with a support substrate under free radical activation conditions to form a covalent bond therebetween.In another embodiment, a cryptand ion exchange composition is made by covalently bonding unsaturated carbon to carbon moieties pendant from a derivatized ion binding cryptands with unsaturated carbon to carbon moieties pendant from a support substrate under free radical activation conditions to form covalent bond.
Abstract:
A method of reclaiming a well completion brine solution by using an organic chelant that is capable of discriminating between (i) iron and non-zinc heavy metals; and (ii) calcium and zinc. The chelant contains a functional group selected from the group —CO2H or —PO(OH)R20 or a salt or ester thereof, —C(O)—, —OE, —SE, —N═C(R2)R3, EO—N═C(R2)R3, —N(R2)R3, and —N(C(O)R1)R2 group optionally substituted with a —COOH or —PO(OH)R20 or a salt or ester thereof, —SE or —OE group, wherein R2 and R3 are independently selected from E or forms, with nitrogen, phosphorous, oxygen or sulfur, a heterocyclic ring; E is R1 or —H; R1 is a C1-C30 alkyl or aralkyl group or a derivative thereof and R20 is —OH or R1.
Abstract:
Process for the preparation of a composite solid material which fixes inorganic contaminants, based on metal hexacyanoferrate, comprising a solid support coated with a film of an anion-exchange polymer to which is fixed an insoluble metal hexacyanoferrate forming a thin layer, said process essentially comprising at least one step in which said solid support is brought into contact with at least one liquid reactant and at least one step in which washing is carried out with a washing liquid, characterized in that all of the steps of the process are carried out continuously in one and the same receptacle, such as a column, in which the support forms a fluidized bed, the fluidization of which is provided by said at least one reactant or washing liquid.