Analysis of conjugated metabolites of alcohol consumption
A method, system, kit and uses for quantifying and normalizing at least one product of ethanol metabolism are provided. A method is provided for quantifying and normalizing at least one product of ethanol metabolism in a sample comprising creatinine. The method comprises adding a predetermined amount of at least one internal standard to the sample; adding deuterated creatinine to the sample; detecting and measuring at least one product of ethanol metabolism, the predetermined amount of at least one internal standard in the sample, the deuterated creatinine, and the creatinine. The method also comprises quantifying the amount of at least one product of ethanol metabolism in the sample using the measurement of the at least one internal standard; quantifying the amount of creatinine in the sample using the measurement of the deuterated creatinine; and normalizing the quantity of the at least one product of metabolism using the measurement of the creatinine.
1 . A method for quantifying and normalizing at least one product of ethanol metabolism in a sample, said sample comprising creatinine, said method comprising:
(i) adding a predetermined amount of at least one internal standard to the sample;
(ii) adding deuterated creatinine to the sample;
(iii) detecting and measuring the at least one product of ethanol metabolism, the at least one predetermined amount of internal standard in the sample, the deuterated creatinine, and the creatinine;
(iv) quantifying the amount of the at least one product of ethanol metabolism in the sample using the measurement of the at least one internal standard;
(v) quantifying the amount of the creatinine in the sample using the measurement of the deuterated creatinine; and
(vi) normalizing the quantity of the at least one product of ethanol metabolism using the measurement of the creatinine.
2 . The method according to claim 1 wherein the sample is urine.
3 . The method according to claim 1 wherein the sample is saliva.
4 . The method according to claim 1 wherein the sample is blood or plasma.
5 . The method according to claim 1 wherein the sample is obtained from a mammal.
6 . The method according to claim 4 wherein the mammal is a human.
7 . The method according to claim 1 wherein the detecting and measuring is performed by a mass spectrometer.
8 . The method according to claim 6 wherein the mass spectrometer comprises a triple quadrupole.
9 . The method according to claim 1 wherein the at least one product of metabolism is ethyl glucuronide.
10 . The method according to claim 8 wherein the at least one internal standard is deuterated ethyl glucuronide.
11 . The method according to claim 1 wherein the at least one product of metabolism is ethyl sulphate.
12 . The method according to claim 10 wherein the at least one internal standard is deuterated ethyl sulphate.
13 . The method according to claim 1 wherein the sample can be diluted before addition of the at least one internal standard.
14 . The method according to claim 1 wherein the method is automated.
15 . Use of the method according to claim 1 to predict the time and level of alcohol in a source.
16 . The use according to claim 14 wherein the source is a mammal .
17 . Use of the method according to claim 1 to monitor alcohol in a source.
18 . The use according to claim 16 wherein the source is a mammal.
19 . A system for monitoring ethanol metabolism in a source using a mass spectrometer to analyze a sample from the source, said sample comprising creatinine, indicative of the physical state of the source, said system comprising a controller adapted to:
(i) automatically dilute the sample by a predetermined amount at least once;
(ii) add a predetermined amount of an internal standard to the at least one diluted sample;
(iii) add deuterated creatinine to the sample;
(iv) detect and measure at least one product of ethanol metabolism, the at least one internal standard in the sample, the deuterated creatinine, and the creatinine;
(v) quantify the amount of the at least one product of ethanol metabolism in the sample using the measurement of the at least one internal standard;
(vi) quantify the amount of creatinine in the sample using the measurement of the deuterated creatinine; and
(vii) normalize the quantity of the at least one product of ethanol metabolism using the measurement of the creatinine.
20 . The system according to claim 18 wherein the source is a mammal.
21 . The system according to claim 19 wherein the source is a human.
22 . The system according to claim 18 wherein the mass spectrometer comprises a triple quadrupole.
23 . The system according to claim 18 wherein the sample is urine.
24 . The system according to claim 18 wherein the sample is saliva.
25 . The system according to claim 18 wherein the sample is blood/plasma
26 . The system according to claim 18 wherein the at least one product of ethanol metabolism is ethyl glucuronide.
27 . The system according to claim 24 wherein the at least one internal standard is deuterated ethyl glucuronide.
28 . The system according to claim 18 wherein the at least one product of ethanol metabolism is ethyl sulphate.
29 . The system according to claim 26 wherein the at least one internal standard is deuterated ethyl sulphate.
30 . The system according to claim 18 wherein the sample is diluted before addition of the at least one internal standard.
31 . A kit for quantifying and normalizing at least one product of ethanol metabolism in a sample, said sample comprising creatinine, said kit comprising at least one of the following: a sample, a deuterated internal standard, a calibration standard, a quality control check, instructions, and combinations thereof.