MAGNETIC NANOSENSOR COMPOSITIONS AND BIOANALYTICAL ASSAYS THEREFOR
First Claim
1. A system for the detection of an analyte in a liquid sample, the system comprising at least one nanoparticle comprising a polymer matrix layer about a magnetic core, wherein the polymer matrix layer has a specific volume that varies as a function of a presence and/or concentration of the analyte in the liquid sample, and wherein a change in the specific volume of the polymer matrix layer corresponds to a change in an NMR-measured property of protons in the liquid sample in the vicinity of the at least one nanoparticle.
4 Assignments
0 Petitions
Accused Products
Abstract
Disclosed are magnetic nanosensors or transducers that permit measurement of a physical parameter in an analyte via magnetic reasonance measurements, in particular of non-agglomerative assays. More particularly, in certain embodiments, the invention relates to designs of nanoparticle reagents and responsive polymer coated magnetic nanoparticles. Additionally provided are methods of use of nanoparticle reagents and responsive polymer coated magnetic nanoparticles for the detection of a stimulus or an analyte with NMR detectors.
-
Citations
30 Claims
- 1. A system for the detection of an analyte in a liquid sample, the system comprising at least one nanoparticle comprising a polymer matrix layer about a magnetic core, wherein the polymer matrix layer has a specific volume that varies as a function of a presence and/or concentration of the analyte in the liquid sample, and wherein a change in the specific volume of the polymer matrix layer corresponds to a change in an NMR-measured property of protons in the liquid sample in the vicinity of the at least one nanoparticle.
- 12. A system for the detection of a property of a liquid sample, the system comprising at least one nanoparticle comprising a polymer matrix layer about a magnetic core, wherein the polymer matrix layer has a specific volume that varies as a function of the liquid sample property to be detected, and wherein a change in the specific volume of the polymer matrix layer corresponds to a change in an NMR-measured property of protons in the liquid sample in the vicinity of the at least one nanoparticle.
-
14. A method for detecting an analyte in a liquid sample, the method comprising the steps of:
-
(a) exposing at least one magnetic nanoparticle to a liquid sample, wherein the at least one nanoparticle comprises a polymer matrix layer about a magnetic core, the polymer matrix layer having a specific volume that varies as a function of the presence and/or concentration of the analyte; and
/or(b) applying an external magnetic field to the at least one magnetic nanoparticle; (c) applying an RF excitation to detect protons of freely diffusing water molecules in the liquid sample in the vicinity of the at least one magnetic nanoparticle; (d) measuring a T1 and/or T2 relaxivity following application of the RF excitation; and (e) determining the presence and/or concentration of the analyte in the liquid sample using the T1 and/or T2 relaxivity. - View Dependent Claims (15)
-
-
16. A method for detecting a property of a liquid sample, the method comprising the steps of:
-
(a) exposing at least one magnetic nanoparticle to a liquid sample, wherein the at least one nanoparticle comprises a polymer matrix layer about a magnetic core, the polymer matrix layer having a specific volume that varies as a function of the liquid sample property to be detected; (b) applying an external magnetic field to the at least one magnetic nanoparticle; (c) applying an RF excitation to detect protons of freely diffusing water molecules in the liquid sample in the vicinity of the at least one magnetic nanoparticle; (d) measuring a T1 and/or T2 relaxivity following application of the RF excitation; (e) determining the liquid sample property using the T1 and/or T2 relaxivity.
-
-
17. An apparatus for the detection of an analyte in a liquid sample, the apparatus comprising:
-
a substrate; at least one nanoparticle at least partially immobilized on the substrate, wherein the at least one nanoparticle comprises a polymer matrix layer about a magnetic core, wherein the polymer matrix layer has a specific volume that varies as a function of a presence and/or concentration of the analyte in the liquid sample, and wherein a change in the specific volume of the polymer matrix layer corresponds to a change in an NMR-measured property of protons in the liquid sample in the vicinity of the at least one nanoparticle. - View Dependent Claims (18)
-
-
19. A smart device for delivery or release of a moiety into a body, the smart device comprising:
- a sensing element comprising at least one nanoparticle, said nanoparticle comprising a polymer matrix layer about a magnetic core, said polymer matrix layer responsive to a condition of a volume of fluid (e.g., fluid of a body) in contact with said nanoparticle;
an RF antenna configured to detect an echo RF signal from said volume of fluid following RF excitation of said volume; a processor configured to determine a measurement of said condition based at least in part on said detected echo RF signal; a stimulus emitter configured to emit a stimulus in response to said measurement of said condition; and a control release element configured to release or deliver a moiety out of said polymer matrix layer (e.g., and into said body) upon receiving said stimulus. - View Dependent Claims (20)
- a sensing element comprising at least one nanoparticle, said nanoparticle comprising a polymer matrix layer about a magnetic core, said polymer matrix layer responsive to a condition of a volume of fluid (e.g., fluid of a body) in contact with said nanoparticle;
-
21. A smart device for delivery or release of a moiety into a body, the smart device comprising:
-
a sensing element implantable within a body, said sensing element comprising at least one nanoparticle, said nanoparticle comprising a polymer matrix layer about a magnetic core, said polymer matrix layer responsive to a condition of a volume of fluid in contact with said nanoparticle; a miniaturized NMR detector functioning in conjunction with said sensing element to detect an echo RF signal from said volume of fluid following RF excitation of said volume; a processor configured to determine a measurement of said condition based at least in part on said detected echo RF signal; a stimulus emitter configured to emit a stimulus in response to said measurement of said condition; a control release element configured to release or deliver a moiety out of said polymer matrix layer (e.g., and into a body) upon receiving said stimulus; and a power source for powering operation of said smart device. - View Dependent Claims (22)
-
-
23. A method for detection of an analyte in a sample, the method comprising:
-
(a) providing nanosensors, wherein the nanosensors comprise magnetic nanoparticles linked to an analyte or analog thereof, and one or more binding moieties linked thereto, the binding moieties responsive to said analyte or analog thereof; (b) providing a fluid sample and placing the sample and the nanosensors in a container under conditions and for a sufficient period of time to allow analyte in the sample to bind to and compete off the binding moiety from the nanosensor; (c) placing the container in proximity to an NMR detector; (d) measuring one or more relaxivity parameters of the sample in the container; and (e) determining one or more attributes relative to the sample; wherein the nanoparticle, binding moiety and analyte or analog thereof linked to the nanoparticle are size optimized to confer optimal relaxation measurements. - View Dependent Claims (25, 26, 27, 28, 29, 30)
-
-
24. A method for detection of an analyte in a sample, the method comprising:
-
(a) providing a fluid sample and one or more binding moieties, the binding moieties responsive to a target analyte or analog thereof and placing the sample and binding moieties under conditions and for a sufficient period of time to allow analyte in the sample to bind to binding moiety; (b) providing nanosensors comprising magnetic nanoparticles linked to analyte or an analog thereof; (c) placing the pre-incubated sample and binding moiety and the nanosensors in a container under conditions and for a sufficient period of time to allow analyte linked to nanosensors to bind to and compete off the binding moiety from the analyte in the sample; (d) placing the container in proximity to an NMR detector; (e) measuring one or more relaxivity parameters of the sample in the container; and (f) determining one or more attributes relative to the sample; wherein the nanoparticle, binding moiety and analyte or analog thereof linked to the nanoparticle are size optimized to confer optimal relaxation measurements.
-
Specification