Method of contemporaneously monitoring changes in analyte concentration in a plurality of samples on individual schedules
A method of contemporaneously monitoring changes in analyte concentration in a plurality of samples using a single monitoring device, wherein monitoring can be commenced and continued on independent timelines for each sample.
1. A method of monitoring changes in analyte concentration in a plurality of samples, comprising the steps of:
(a) obtaining at least two separate and independent vessels, each defining a single retention chamber and having an analyte sensitive probe within the retention chamber,
(b) placing a test sample into each vessel to form filled vessels, and
(c) periodically interrogating the probe within each filled vessel employing a single interrogation device wherein (i) interrogations measure changes in the probe reflective of changes in analyte concentration within the retention chamber of the filled vessel, (ii) an initial interrogation is taken at time t 0 for each filled vessel, (iii) subsequent interrogations of each filled vessel are taken periodically on a schedule measured from the t 0 for each filled vessel, and (iv) the initial interrogation of each filled vessel is taken at a different time of day.
2. The method of claim 1 , wherein the analyte is oxygen.
3. The method of claim 1 , wherein the method monitors consumption of oxygen by viable bacteria in the sample and correlates measured changes in oxygen concentration to a concentration of bacteria in the sample prior to monitoring.
4. The method of claim 1 , wherein the vessel is a vial formed from an oxygen barrier material.
5. The method of claim 4 , wherein (i) the vials have an open top end and a closed bottom end, and (ii) the probe is positioned within the retention chamber of each vial proximate the bottom end.
6. The method of claim 1 , wherein the vessel is a cuvette formed from an oxygen barrier material.
7. The method of claim 1 , wherein the step of obtaining at least two separate and independent vessels comprises the step of obtaining at least ten vessels.
8. The method of claim 1 , wherein at least two filled vessel are contemporaneously interrogated.
9. The method of claim 8 , wherein the initial interrogation for at least one filled vessel occurs subsequent to the subsequent interrogation of at least one other filled vessel.
10. The method of claim 1 , wherein at least three filled vessel are contemporaneously interrogated.
11. The method of claim 10 , wherein the initial interrogation for at least one filled vessel occurs subsequent to the subsequent interrogation of at least two other filled vessels.
12. The method of claim 10 , wherein the initial interrogation for at least two filled vessels occurs subsequent to the subsequent interrogation of at least one other filled vessel.
13. The method of claim 1 , wherein at least ten filled vessel are contemporaneously interrogated.
14. The method of claim 1 , wherein the probe is an oxygen sensitive photoluminescent dye.
15. The method of claim 14 wherein the oxygen sensitive photoluminescent dye is an oxygen sensitive transition metal complex.
16. The method of claim 15 wherein the oxygen sensitive transition metal complex is selected from the group consisting of a ruthenium bipyridyl, a ruthenium diphenylphenanotroline, a platinum porphyrin, a palladium porphyrin, a phosphorescent complex of a tetrabenzoporphyrin, a chlorin, a porphyrin-ketone, an aza-porphyrin and a long-decay luminescent complex of iridium(III) or osmium(II).
17. The method of claim 1 wherein the test sample is a food product intended for human consumption.
18. The method of claim 1 wherein the food product has been stomached prior to placement in the vessel.
19. The method of claim 1 wherein the interrogations measure changes in the probe reflective of changes in analyte concentration dissolved within the test sample retained within the retention chamber of the filled vessel.
20. The method of claim 1 wherein interrogations measure photoluminescence lifetime.
21. The method of claim 1 wherein a human perceptible reminder signal and information identifying a specific filled vessel scheduled for the next forthcoming subsequent interrogation is generated by the interrogation device for each subsequent interrogation.
22. The method of claim 1 wherein each vessel is tagged with a barcode and the information identifying a specific filled vessel is the barcode.