US6991918B2
Expired / Lapsed
US
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Methods for improving sensitivity of oxygen biosensors
Assignee: Becton Dickinson and Co
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Filing: 2001-09-28
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Granted: 2006-01-31
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Expires: 2021-09-28
Abstract
Abstract A method for detecting oxygen in a test sample is provided, the method involving exposing a test sample and a control sample to sensor compositions having a luminescent compound capable of generating a signal indicative of oxygen depletion. The method further involves determining the strengths of such signals for the test sample versus the control sample, and using the difference to determine whether oxygen in the test sample is being consumed.
Inventors
- 👤 Steven C. Keith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:33
CPC Classifications
C; C12; C12Q; C12Q1/00; C12Q1/02; C12Q1/04; C12Q1/18; C12Q2304/00; C12Q2304/40; C12Q2304/44; Y; Y10; Y10T; Y10T436/00; Y10T436/20
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
211 words
A method for detecting oxygen consumption in a test sample comprising: exposing a test sample to a first sensor composition and a control sample to a second sensor composition, said first and second sensor composition comprising a luminescent compound being inhibited from generating a detectable signal in the presence of an inhibitory amount of oxygen and which generates a detectable signal as the inhibitory amount of oxygen is reduced; determining the strength of a first said detachable signals generated by said first sensor composition at time intervals; determining the strength of a second said detectable signal generated by said second sensor composition at said time intervals; comparing the strengths of said first signal with said second signal over said time intervals and determining whether oxygen in said test sample has been consumed wherein said comparing step comprises: normalizing said first said detectable signals and said second said detectable signals, said normalizing step comprising: dividing each said first said detectable signal by an initial said first said detectable signal; and dividing each said second said detectable signal by an initial said second said detectable signal; calculating the area between curves representative of said normalized first said detectable signals and said normalized said second said detectable signals; and comparing said area to zero.
Claim 2
Independent Claim
211 words
A method for detecting oxygen consumption in a test sample comprising: exposing a test sample to a first sensor composition and a control sample to a second sensor composition, said first and second sensor composition comprising a luminescent compound being inhibited from generating a detectable signal in the presence of an inhibitory amount of oxygen and which generates a detectable signal as the inhibitory amount of oxygen is reduced; determining the strength of a first said detachable signals generated by said first sensor composition at time intervals; determining the strength of a second said detectable signal generated by said second sensor composition at said time intervals; comparing the strengths of said first signal with said second signal over said time intervals and determining whether oxygen in said test sample has been consumed wherein said comparing step comprises: normalizing said first said detectable signals and said second said detectable signals, said normalizing step comprising: dividing each said first said detectable signal by an initial said first said detectable signal; and dividing each said second said detectable signal by an initial said second said detectable signal; calculating the area between curves representative of said normalized first said detectable signals and said normalized said second said detectable signals; and comparing said area to zero.
Claim 3
Dependent Claim
45 words
The method according to claim 1 , wherein said calculating step comprises the step of subtracting said second said detectable signal from said first said detectable signal at each said time interval to provide a corrected first said detectable signal for each said time interval.
Claim 4
Dependent Claim
30 words
The method of claim 1 , wherein said luminescent compound is contained within a matrix which is relatively impermeable to water and non-gaseous solutes, but which is permeable to oxygen.
Claim 5
Dependent Claim
15 words
The method of claim 3 , wherein said matrix is a rubber or plastic matrix.
Claim 6
Dependent Claim
14 words
The method of claim 3 , wherein said matrix is a silicone rubber matrix.
Claim 7
Dependent Claim
16 words
The method of claim 1 , wherein said luminescent compound is a tris-4,7-diphenyl-1,10-phenanthroline ruthenium (II) salt.
Claim 8
Dependent Claim
15 words
The method of claim 6 , wherein said luminescent compound is tris-4,7-diphenyl-1,10-phenanthroline ruthenium (II) chloride.
Claim 9
Dependent Claim
16 words
The method of claim 1 , wherein said luminescent compound is a tris-2,2′-bipyridyl ruthenium (II) salt.
Claim 10
Dependent Claim
16 words
The method of claim 8 , wherein said luminescent compound is tris-2,2′-bipyridyl ruthenium (II) chloride hexahydrate.
Claim 11
Dependent Claim
13 words
The method of claim 1 , wherein said luminescent compound is 9,10-diphenyl anthracene.
Claim 12
Dependent Claim
21 words
A method according to claim 1 , wherein said test sample and said control sample are substantially isolated from atmospheric oxygen.
Claim 13
Dependent Claim
36 words
A method according to claim 1 , wherein said test sample comprises a reaction mixture of at least one enzyme which catalyzes oxidative reactions, admixed with a quantity of at least one drug, toxin or chemical.
Claim 14
Dependent Claim
17 words
The method of claim 12 , wherein said at least one enzyme comprises enzymes in liver cells.
Claim 15
Dependent Claim
17 words
The method of claim 12 , wherein the at least one enzyme comprises a cytochrome P450 enzyme.
References Cited (Backward Citations)
US5567598A
Cited
US6395506B1
Cited
US6900030B2
Cited
US6080574A
Cited
US5998517A
Cited
US6616896B2
Cited
US6538735B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2009-01-30 | 2009-08-01 | 2010-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2013-01-30 | 2013-08-01 | 2014-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2017-01-30 | 2017-08-01 | 2018-01-31 | $7700.00 | Window Closed / Lapsed |