Systems and methods for automated, customizable sample preparation for detection of metabolites and lipids
Described herein are automated and customizable sample preparation and analysis systems for detection and quantification of biomarkers (e.g., metabolites and/or lipids) in biological samples (e.g., blood, serum, or plasma) in a clinical setting. The automated systems are controlled by scripts that integrate communication between the components of the sample preparation system. Also described herein are mass spectrometry-based analytical methods featuring efficient system calibration and sample analysis that provide for accurate quantification of a set of markers in biological samples. The methods are capable of automatic high sample throughput in a clinical setting for detection and quantification using a mass spectrometry system and high performance liquid chromatography column.
1. A method for automated sample handling for extraction, detection and quantification of at least one metabolite biomarker in at least one biological sample, the method comprising the steps of:
(a) thawing the at least one biological sample on a cooler block shaped and sized to hold the at least one biological sample;
(b) mixing the at least one thawed biological sample;
(c) following step (b), pipetting:
(i) the at least one biological sample into at least one plate,
(ii) at least one blank sample into the at least one plate, and
(iii) at least one quality control sample into the at least one plate;
(d) pipetting a solvent and an internal standard into (i) each of the at least one biological sample in the at least one plate, (ii) each of the at least one blank sample in the at least one plate, and (iii) each of the at least one quality control sample in the at least one plate;
(e) shaking the at least one biological sample, the solvent, and the internal standard in the at least one plate;
(f) incubating the at least one biological sample, the solvent, and the internal standard in the at least one plate on the cooler block;
(g) centrifuging the at least one incubated biological sample in the at least one plate;
(h) removing a first supernatant from the at least one centrifuged biological sample to at least one first analysis plate;
(i) applying nitrogen flow to the first supernatant of the at least one biological sample in the at least one first analysis plate to obtain at least one dried biological sample;
(j) resuspending the at least one dried biological sample in the at least one first analysis plate;
(k) centrifuging the at least one resuspended biological sample in the at least one first analysis plate;
(l) removing a second supernatant from the at least one centrifuged biological sample from step (k) in the at least one first analysis plate to at least one second analysis plate;
(m) following step (l), placing the at least one second analysis plate in a metabolite separations/analytics subsystem; and
(n) following step (m), generating at least one analysis report for the at least one biological sample.
2. The method of claim 1 , wherein the at least one biological sample is 96 biological samples.
3. The method of claim 1 , wherein the at least one biological sample is identified via a code and wherein the code is a member selected from a group consisting of: 2D code, 3D code, barcode, and RFID.
4. The method of claim 1 , wherein each of the at least one biological sample is associated with a code and each code corresponds to clinical data.
5. The method of claim 1 , wherein at least 8 biological samples are pipetted at a time.
6. The method of claim 1 , wherein each of the at least one plate is a 96-well plate.
7. The method of claim 1 , wherein the at least one quality control sample is prepared by mixing at least 5 μL of at least two biological samples.
8. The method of claim 1 , comprising incubating the at least one biological sample, the solvent, and the internal standard in step (f) at about 4° C. for at least 15 minutes.
9. The method of claim 1 , wherein the at least one incubated biological sample is centrifuged in step (g) and/or the at least one resuspended biological sample is centrifuged in step (k) at at least about 1000 g for at least 15 minutes.
10. The method of claim 1 , wherein the nitrogen flow is applied at about room temperature for at least 80 minutes.
11. The method of claim 1 , wherein the at least one dried biological sample from step (i) is resuspended in step (j) with H 2 O:ACN.
12. The method of claim 1 , wherein resuspending in step (j) is sequential aspirating and dispensing of the at least one dried biological sample at least 50 times.
13. The method of claim 1 , wherein centrifuging the at least one resuspended biological sample in step (k) comprises centrifuging for at least 6 minutes.
14. The method of claim 1 , wherein a third supernatant comprising at least 35 μL of the second supernatant from the at least one second analysis plate is moved to a final analysis plate.
15. The method of claim 14 , wherein at least 10 μL of the third supernatant from the final analysis plate are transferred to a second final analysis plate where H 2 O:ACN is added to dilute the transferred supernatant in the second final analysis plate.
16. The method of claim 1 , wherein the metabolite separations/analytics subsystem comprises an HPLC and a mass spectrometer.
17. The method of claim 1 , wherein the at least one first analysis plate and the at least one second analysis plate are stored at 4° C. until an analysis.
18. The method of claim 1 , wherein the at least one analysis report is generated by a memory having instructions stored thereon, wherein the instructions, when executed by a computer processor, cause the computer processor to execute a script, wherein the script prescribes processing of the at least one biological sample via coordinated operation of a liquid handling arm, a plate handler; a code reader, the cooler block, a heater shaker unit, a centrifuge, a nitrogen drier, and the metabolite separations/analytics subsystem.
19. The method of claim 1 , the method comprising, following the step of placing the at least one second analysis plate in the metabolite separations/analytics subsystem, performing one or more members selected from the group consisting of (i), (ii), and (iii), as follows:
a reverse phase column based method;
(ii) a flow injection analysis based method; and
(iii) an amide-column based method.
20. The method of claim 19 , wherein the reverse phase column based method is a member selected from the group consisting of a C18 reverse phase column method, a C18 50 mm reverse phase column method, a C18 100 mm reverse phase column method, a 50 mm reverse phase column method and a 100 mm reverse phase column method.
21. The method of claim 1 , wherein step (b) comprises mixing the at least one thawed biological sample by repeated pipetting or shaking the at least one thawed biological sample.
22. The method of claim 1 , wherein the solvent is methanol.