Functionalized nanocrystals and their use in detection systems
First Claim
1. A water-soluble, functionalized nanocrystal comprising:
- a quantum dot having a core and a shell;
a capping compound operably linked to the quantum dot, wherein the capping compound comprises a compound having the formula HS(CH2)n X, wherein X is a carboxylate; and
a diaminocarboxylic acid which is operably linked to the capping compound.
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Abstract
Provided are compositions comprising water-soluble, functionalized nanocrystals. The water-soluble functionalized nanocrystals comprise quantum dots capped with a layer of a capping compound, and further comprise, by operably linking and in a successive manner, one or more additional compounds. The one or more additional compounds is comprised of at least a diaminocarboxylic acid which is operatively linked to the capping compound, and may further comprise an amino acid, an affinity ligand, or a combination thereof. Also provided are methods of using the functionalized nanocrystals having an affinity ligand to detect the presence or absence of a target substrate in a sample. The method comprises contacting the functionalized nanocrystals with the sample so that complexes are formed between the functionalized nanocrystals and substrate, if the substrate is present; exposing the complexes in the detection system to a wavelength of light suitable for exciting the functionalized nanocrystals of the complexes to emit a luminescence peak; and detecting the emitted luminescence peak.
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Citations
47 Claims
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1. A water-soluble, functionalized nanocrystal comprising:
- a quantum dot having a core and a shell;
a capping compound operably linked to the quantum dot, wherein the capping compound comprises a compound having the formula HS(CH2)n X, wherein X is a carboxylate; and
a diaminocarboxylic acid which is operably linked to the capping compound. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 36, 37, 38)
- a quantum dot having a core and a shell;
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10. A water-soluble, functionalized nanocrystal comprising:
- a quantum dot having a core and a shell;
a capping compound operably linked to the quantum dot, wherein the capping compound comprises a compound having the formula HS(CH2)n X, wherein X is a carboxylate;
a diaminocarboxylic acid which is operably linked to the capping compound; and
an amino acid which is operably linked to the diaminocarboxylic acid. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 39, 40, 41)
- a quantum dot having a core and a shell;
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21. A water-soluble, functionalized nanocrystal comprising:
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(a) a quantum dot having a core wherein the core comprises CdX, and wherein X is Se, Te or S; (b) a shell, wherein the shell comprises YZ, and wherein Y is Cd or Zn, and Z is S, or Se; (c) a capping compound operably linked to the quantum dot, wherein the capping compound comprises a compound having the formula HS(CH2)n X, and wherein X is a carboxylate; and (d) a diaminocarboxylic acid which is operably linked to the capping compound. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 42, 43, 44, 45, 46, 47)
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Specification