Fluorescent detector systems for the detection of chemical perturbations in sterile storage devices
System and method for detecting and measuring chemical perturbations in a sample. The system and method are useful for non-invasive pH monitoring of blood or blood products sealed in storage bags.
1. A method for monitoring a parameter of a sample, comprising:
(a) irradiating a fluorescent seminaphthofluorescein species having a first emission intensity at a first emission wavelength and a second emission intensity at a second emission wavelength, each emission intensity dependent upon a parameter, which excitation light emanating from a probe physically isolated from the fluorescent species to provide first and second emission intensities, wherein the fluorescent species is in liquid communication with a sample contained in a vessel;
(b) measuring the first and second emission intensities to determine a first parameter reading of the sample; and
(c) repeating step (a) after a pre-determined time and measuring the first and second emission intensities to determine a second parameter reading of the sample.
2. The method of claim 1 , wherein step (c) is repeated to provide multiple parameter readings to monitor the parameter of the sample over time.
3. The method of claim 1 , wherein the parameter is pH.
4. The method of claim 1 , wherein the parameter is CO 2 .
5. The method of claim 1 further comprising electronically writing parameter readings to the vessel containing the sample.
6. A method for monitoring the pH of a sample, comprising:
(a) irradiating a fluorescent seminaphthofluorescein species in liquid communication with a sample contained in a vessel with excitation light emanating from a probe physically isolated from the fluorescent species, wherein the excitation light has a wavelength sufficient to effect fluorescent emission from the fluorescent species, wherein the fluorescent species exhibits a first emission intensity at a first emission wavelength and a second emission intensity at a second wavelength, the ratio of the first and second emission intensities being dependent upon pH, wherein the first and second emission wavelengths are not the same;
(b) measuring the first and second emission intensities to determine a first parameter reading of the sample; and
(c) repeating step (a) after a pre-determined time and measuring the first and second emission intensities to determine a second parameter reading of the sample.
7. The method of claim 6 , wherein step (c) is repeated to provide multiple pH readings to monitor the pH of the sample over time.
8. The method of claim 6 further comprising electronically writing pH readings to the vessel containing the sample.
9. The method of claim 1 , wherein the pre-determined time is from about 1 minute to about 1 day.
10. The method of claim 1 , wherein the pre-determined time is from about 1 hour to about 12 hours.
11. The method of claim 2 , further comprising obtaining a sample profile from the multiple readings.
12. The method of claim 11 , further comprising determining sample quality from the profile.
13. The method of claim 6 , wherein the probe is physically isolated from the fluorescent species by a window transparent to the excitation light and the fluorescent emission.
14. The method of claim 1 , wherein the fluorescent species is a seminaphthofluorescein compound selected from the group consisting of 5′(and 6′)-carboxy-3,10-dihydroxy-spiro[7H-benzo[c]xanthene-7,1′(3′H)-isobenzofuran]-3′-one and 2-(2-chloro-3-hydroxy-9-carboxyethyl-10-oxo-10H-benzo[c]xanthen-7-yl)benzoic acid.
15. The method of claim 1 , wherein the fluorescent species is a conjugate of a fluorescent species and a macromolecule.
16. The method of claim 15 , wherein the macromolecule is an albumin.
17. The method of claim 1 , wherein the fluorescent species is a seminaphthofluorescein/human serum albumin conjugate.
18. The method of claim 1 , wherein the sample comprises blood or a blood product.
19. The method of claim 1 , wherein the vessel is a sealed vessel.