Multi-analyte sensing tissue-integrating sensors
Some embodiments described herein relate to a sensor that includes a first a first polymer-luminescent sensing compound configured to produce a first luminescent signal in the presence of a first analyte and a second polymer-luminescent sensing compound configured to produce a second luminescent signal in the presence of a second analyte. The second luminescent signal can have a luminescent lifetime that is at least 1.1 times greater than a luminescent lifetime of the first luminescent signal. Such temporally differences in signal can be used to deconvolute the first luminescent signal from the second luminescent signal even when, for example, the first luminescent signal and the second luminescent signal have the same or a similar emission spectrum.
1. A sensor, comprising:
a first polymer-luminescent sensing compound including a first polymer and a dye, the first polymer-luminescent compound configured to produce a first luminescent signal in the presence of a first analyte; and
a second polymer-luminescent sensing compound including a second polymer and the dye, the second polymer-luminescent compound configured to produce a second luminescent signal in the presence of a second analyte, a spectrum of the second luminescent signal overlapping a spectrum of the first luminescent signal, the second luminescent signal having a longer luminescent lifetime than the first luminescent signal.
2. The sensor of claim 1 , wherein the first luminescent signal has a greater intensity than the second luminescent signal.
3. The sensor of claim 1 , wherein the second luminescent signal has a luminescent lifetime that is at least 1.1 times greater than a luminescent lifetime of the first luminescent signal.
4. The sensor of claim 1 , wherein the second luminescent signal has a luminescent lifetime that is at least 1.6 times greater than a luminescent lifetime of the first luminescent signal.
5. The sensor of claim 1 , wherein the second luminescent signal has a luminescent lifetime of at least 350 microseconds.
6. The sensor of claim 1 , wherein the second polymer-luminescent sensing compound includes:
Pd-BP-AEME-4,
hydroxyethyl methacrylate, and
ethylene glycol dimethacrylate, a weight percentage of ethylene glycol dimethacrylate selected such that the second luminescent signal has the luminescent lifetime that is at least 1.1 times greater than a luminescent lifetime of the first luminescent signal.
7. The sensor of claim 1 , wherein the first analyte is oxygen and the second analyte is glucose.
8. A sensor, comprising:
a first polymer-luminescent compound including a first polymer and a fluorescent dye configured to emit light in an emission spectrum in response to being excited with light having an excitation frequency, the first polymer-luminescent compound configured to produce a first luminescent signal in the presence of a first analyte; and
a second polymer-luminescent compound including a second polymer and the fluorescent dye, the second polymer-luminescent sensing compound configured to produce a second luminescent signal in the presence of a second analyte, a spectrum of the second luminescent signal overlapping a spectrum of the first luminescent signal, the second luminescent signal having a longer luminescent lifetime than the first luminescent signal.
9. A sensor, comprising:
a first polymer-luminescent compound configured to produce a first luminescent signal in the presence of a first analyte, the first polymer-luminescent compound including a first polymer and a fluorescent dye configured to emit light in an emission spectrum in response to being excited with light having an excitation frequency; and
a second polymer-luminescent sensing compound configured to produce a second luminescent signal in the presence of a second analyte that has a spectrum that overlaps a spectrum of the first luminescent signal, the second polymer-luminescent compound including a second polymer and the fluorescent dye, at least one of the first polymer or the second polymer configured to alter temporal characteristics of the fluorescent dye such that the second luminescent signal has a longer lifetime than the first luminescent signal.
10. A sensor, comprising:
a first polymer-luminescent sensing compound configured to produce a first luminescent signal in the presence of a first analyte; and
a second polymer-luminescent sensing compound configured to produce a second luminescent signal in the presence of a second analyte, the first luminescent signal and the second luminescent signal having a common spectral signature, the second luminescent signal having a longer luminescent lifetime than the first luminescent signal.
11. A sensor, comprising:
a first polymer-luminescent sensing compound including an oxygen-sensitive dye and configured to produce a first luminescent signal in the presence of oxygen;
a second polymer-luminescent sensing compound including the oxygen-sensitive dye and configured to produce a second luminescent signal in the presence of an analyte selected from the group consisting of glucose, lactate, alcohol, ascorbate, histamine, cholesterol, and pyruvate, a spectrum of the second luminescent signal overlapping a spectrum of the first luminescent signal, the second luminescent signal having a longer luminescent lifetime than the first luminescent signal.
12. The sensor of claim 11 , wherein the second polymer-luminescent sensing compound includes an oxidase configured to cause oxygen to form H 2 O 2 in the presence of the second analyte such that the oxygen-sensitive dye included in the second polymer-luminescent sensing compound produces the second luminescent signal based on a concentration of the second analyte.
13. A method,
formulating a first polymer-luminescent sensing compound by polymerizing a fluorescent dye with at least one of a first monomer, a first crosslinker, or a first polymer such that when illuminated by an excitation signal, the first polymer-luminescent sensing compound produces a first luminescent signal in the presence of a first analyte; and
formulating a second polymer-luminescent sensing compound by polymerizing the fluorescent dye with at least one of a second monomer, a second crosslinker, or a second polymer such that when illuminated by the excitation signal, the second polymer-luminescent sensing compound produces a second luminescent signal in the presence of a second analyte, the second luminescent signal having a longer luminescent lifetime than the first luminescent signal.
14. The method of claim 13 , wherein:
the at least one of the first polymer, the first crosslinker, or first polymer are the same as the at least one second polymer, second crosslinker, or second polymer; and
a percentage by weight of the at least one of the first polymer, the first crosslinker, or first polymer in the first polymer-luminescent sensing compound is different than a percentage by weight of the at least one second polymer, second crosslinker, or second polymer in the second polymer-luminescent sensing compound.
15. The method of claim 13 , wherein at least one of the at least one of the first polymer, the first crosslinker, or first polymer differs from at least one of the at least one of the second polymer, second crosslinker, or second polymer.
16. The method of claim 13 , wherein:
the fluorescent dye is an oxygen-sensitive dye;
the first analyte is oxygen; and
the second polymer-luminescent sensing compound includes an oxidase configured to cause oxygen to form H 2 O 2 in the presence of the second analyte such that the oxygen-sensitive dye included in the second polymer-luminescent sensing compound produces the second luminescent signal based on a concentration of the second analyte.
17. The method of claim 13 , wherein the luminescent lifetime of the second luminescent signal is at least 1.1 times greater than the luminescent lifetime of the first luminescent signal.
18. The method of claim 13 , further comprising layering the first polymer-luminescent sensing compound and the second polymer-luminescent sensing compound to form a sensor configured to detect the first analyte and the second analyte.
19. The method of claim 13 , further comprising:
coating first polymer-luminescent sensing compound with a passive layer of polymer; and
coating the passive layer of polymer with the second polymer-luminescent sensing compound to form a sensor configured to detect the first analyte and the second analyte.