Biomerieux, Inc.

Doran Spencer

Bernard F Mandrand

Thierry Delair

Abdelhamid Elaissari

Ahmed Arkis

The magnetic colloidal particles comprise a core and an envelope in which the core is magnetic and is coated with at least one polymer comprising functional groups X chosen from amine, hydroxyl, thiol, aldehyde, ester, anhydride, acid chloride, carbonate, carbamate, isocyanate and isothiocyanate groups, or mixtures thereof, at least one fraction of which has reacted with other functional groups of the envelope, and the envelope comprises a polymer bearing ionizable functional groups, Z and Z', which may be identical or different, chosen from amine, carboxylic acid, ester, anhydride, aldehyde, thiol, disulfide, &#x3b1;-halocarbonyl, sulfonic acid, maleimide, isocyanate and isothiocyanate groups, which have partially reacted with the functional groups X of the core. These magnetic colloidal particles can be used to isolate biological material.

Method for transporting or storing a protein, a virus, a prokaryotic cell, or an eukaryotic cell

Method for isolating proteins or protein and nucleic acid associations, or particle and protein complexes, reagent and uses

The invention concerns a method for isolating proteins and/or protein and nucleic acid associations in a sample, comprising steps which consist in: contacting said sample and magnetic colloidal particles comprising a core and a coat wherein: the core is magnetic and is coated with at least a polymer comprising functional groups X selected among amine, hydroxyl, thiol, aldehyde, ester, anhydride, acid chloride, carbonate, carbamate, isocyanate and isothiocyanate groups or mixtures thereof, whereof at least one fraction has reacted with other functional groups of the coat, and the coat consists of a polymer bearing functional groups Z and Z', capable of ionisation, identical or different, selected among amine, carboxylic acid, ester, anhydride, aldehyde, thiol, disulphide, &#x3b1;-halogenocarbonyl, sulphonic acid, maleimide, isocyanate and isothiocyanate groups to form a mixture; incubating said mixture in predetermined conditions; and separating from the mixture the protein and/or protein and nucleic acid associations complexed on the colloidal particles by applying a magnetic field. The invention also concerns a complex consisting of colloidal particles and proteins, a reagent comprising such a complex or colloidal particles.

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Eureka, CA, United States of America

Doran Spencer