Synthesis of fluorescent noble metal nanoparticles
First Claim
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1. A process for the production of noble metal or silica nanoparticles as probes capable to fluoresce to label cells and tissues, the method comprising:
- (1) providing a platform of the nanoparticles;
(2) covering the surfaces of the nanoparticles to saturation with thiol-terminated polymers by one of the following methods;
(a) mixing the nanoparticles with methoxy-(polyethylene glycol)-thiol, the methoxy-(polyethylene glycol)-thiol having a MW of about 10,000 atomic mass units (amu), and biotin-(polyethylene glycol)-thiol, the biotin-(polyethylene glycol)-thiol having a MW of about 10,000 amu;
(b) mixing the nanoparticles with fluorescently-labeled methoxy-(polyethylene glycol)-thiol, the methoxy-(polyethylene glycol)-thiol having a MW of about 10,000 amu and biotin-(polyethylene glycol)-thiol, the biotin-(polyethylene glycol)-thiol having a MW of about 10,000 amu;
(c) coordinating thiol and biotin thiol to the surfaces of the nanoparticles by a non-covalent bond; and
(d) directly conjugating methoxy-thiol and biotin-thiol to the surfaces of the nanoparticles,whereby the polymers bind to the surfaces of the nanoparticles as a brush layer via thiol particle coordination of the thiol ends so that the biotin or methoxy ends are free, thereby obtaining polymer-covered nanoparticles;
(3) homogeneously mixing the resulting polymer-covered nanoparticles with fluorophore labeled avidin or an avidin derivative thereof in proportions of 1 biotin molecule for every 10 to 1000 avidin molecules thereby obtaining fluorescent multi-coloured nanoparticle-avidin complexes and the fluorophore labeled avidin or a derivative thereof being spaced away from the surface of the noble metal or silica nanoparticles, thus reducing or removing the potential quenching of the fluorophore.
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Abstract
A process for the production of fluorescent nanoparticles selected from noble metal or silica nanoparticles. Noble metals or silica nanoparticles provide a platform to which fluorophores and other detection molecules can be added. The fluorescent nanoparticles can be used as regents, diagnostic assays and in the tracking or targeting of tumors.
4 Citations
6 Claims
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1. A process for the production of noble metal or silica nanoparticles as probes capable to fluoresce to label cells and tissues, the method comprising:
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(1) providing a platform of the nanoparticles; (2) covering the surfaces of the nanoparticles to saturation with thiol-terminated polymers by one of the following methods; (a) mixing the nanoparticles with methoxy-(polyethylene glycol)-thiol, the methoxy-(polyethylene glycol)-thiol having a MW of about 10,000 atomic mass units (amu), and biotin-(polyethylene glycol)-thiol, the biotin-(polyethylene glycol)-thiol having a MW of about 10,000 amu; (b) mixing the nanoparticles with fluorescently-labeled methoxy-(polyethylene glycol)-thiol, the methoxy-(polyethylene glycol)-thiol having a MW of about 10,000 amu and biotin-(polyethylene glycol)-thiol, the biotin-(polyethylene glycol)-thiol having a MW of about 10,000 amu; (c) coordinating thiol and biotin thiol to the surfaces of the nanoparticles by a non-covalent bond; and (d) directly conjugating methoxy-thiol and biotin-thiol to the surfaces of the nanoparticles, whereby the polymers bind to the surfaces of the nanoparticles as a brush layer via thiol particle coordination of the thiol ends so that the biotin or methoxy ends are free, thereby obtaining polymer-covered nanoparticles; (3) homogeneously mixing the resulting polymer-covered nanoparticles with fluorophore labeled avidin or an avidin derivative thereof in proportions of 1 biotin molecule for every 10 to 1000 avidin molecules thereby obtaining fluorescent multi-coloured nanoparticle-avidin complexes and the fluorophore labeled avidin or a derivative thereof being spaced away from the surface of the noble metal or silica nanoparticles, thus reducing or removing the potential quenching of the fluorophore. - View Dependent Claims (2, 3, 4, 5)
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6. A process for the production of gold nanoparticles as probes capable to fluoresce to label cells and tissues, the method comprising:
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(1) providing a platform of gold nanoparticles; (2) covering the surfaces of the gold nanoparticles to saturation with thiol-terminated polymers by one of the following methods; (a) mixing the gold nanoparticles with methoxy-(polyethylene glycol)-thiol and biotin-(polyethylene glycol)-thiol; (b) coordinating thiol and biotin thiol to the surfaces of the gold nanoparticles by a non-covalent bond; and (c) directly conjugating methoxy-thiol and biotin-thiol to the surfaces of the gold nanoparticles, whereby the polymers bind to the surfaces of the gold nanoparticles as a brush layer via thiol particle coordination of the thiol ends so that the biotin or methoxy ends are free, thereby obtaining polymer-covered gold nanoparticles; and (3) homogeneously mixing the resulting polymer-covered gold nanoparticles with organic fluorophore labeled avidin or a derivative thereof in proportions of 1 biotin molecule for every 40 to 1000 avidin molecules thereby obtaining fluorescent multi-coloured gold nanoparticle-avidin complexes, fluorophore labeled avidin or a derivative thereof being spaced away from the gold nanoparticle surface, thus reducing or removing the potential quenching of the organic fluorophore.
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Specification