Immobilized metal colloids on dispersed polymer microspheres
First Claim
1. Stable colloidal particles suitable for use in instrumental analyses such as flow cytometry or Raman spectroscopy, each such particle comprised of a colloidal-sized core substrate, an aminodextran coating over the peripheral surface of said substrate and a uniform layer of colloidal-sized metallic solid overlaying said aminodextran coating, wherein the metal for said metallic solid is selected from the group consisting of metals which can be reduced from the ionic state to the metal (O) state by the aminodextran coating the core substrate.
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Accused Products
Abstract
The invention describes stable colloidal polymeric particles of 0.2-5.0 microns size which are coated with a first aminodextran layer and a second metallic solid layer, The metal is coated by reduction of a metallic salt or complex by the aminodextran. The metal coated particles, which preferably are gold- or silver-coated polymeric microspheres, produce side scatter and forward shifts in flow cytometry applications that are in agreement with the theoretical shifts predicted for solid gold or silver spheres of similar size in flow cytometry applications,
106 Citations
35 Claims
- 1. Stable colloidal particles suitable for use in instrumental analyses such as flow cytometry or Raman spectroscopy, each such particle comprised of a colloidal-sized core substrate, an aminodextran coating over the peripheral surface of said substrate and a uniform layer of colloidal-sized metallic solid overlaying said aminodextran coating, wherein the metal for said metallic solid is selected from the group consisting of metals which can be reduced from the ionic state to the metal (O) state by the aminodextran coating the core substrate.
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16. Stable colloidal particles suitable for use in instrumental analyses such as flow cytometry or Raman spectroscopy, each such particle comprised of a colloidal-sized metallic solid deposited on the peripheral surface of an aminodextran-coated, colloidal-sized core polymeric substrate;
- said aminodextran being covalently bonded to said core polymeric substrate by a covalent bond between aminodextran amine groups and amine-reactive functional groups on said core polymeric substrate; and
said metallic solid and said aminodextran being uniformly dispersed on said peripheral surface, wherein the metal for said metallic solid is selected from the group consisting of metals which can be reduced from the ionic state to the metal (O) state by the aminodextran coating the polymeric core substrate. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
- said aminodextran being covalently bonded to said core polymeric substrate by a covalent bond between aminodextran amine groups and amine-reactive functional groups on said core polymeric substrate; and
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29. A method of preparing polymeric particles with a uniform coating of a metallic solid on the peripheral surface of said polymeric particles, said method comprising:
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(a)(1) adsorbing an aminodextran on the surface of a polymeric colloidal-sized particles, said aminodextran being capable of reducing the metal ion or metal ion complex to the metal (O) state;
or(2) covalently binding the aminodextran of (a)(1) to the surface of a polymeric particles; (b)(1) crosslinking the aminodextran coating of the particles of step (a)(1) by addition of a selected crosslinking agent, or (2) crosslinking the aminodextran coating of the particles of step (a)(2) by the addition of a selected crosslinking agent or optionally not crosslinking said coating; (c) washing the crosslinked particles of step (b); (d) mixing together, for a selected reaction time and at a selected reaction temperature, a suspension of the particles of step (c) and a solution of a metal ion or metal ion complex capable of being reduced by the aminodextran coating on the particles of step (c) the reaction time and temperature being sufficient to allow the metal ion or metal ion complex to become coordinated to said aminodextran and subsequently reduced by said aminodextran to the metal (O) state; and (e) separating the metal-coated particles of step (d) and washing the same before using said metal-coated particles. - View Dependent Claims (30, 31, 32, 33, 34, 35)
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Specification