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MB Sample ID: SA096379
| Local Sample ID: | CEMS_4W3 |
| Subject ID: | SU001402 |
| Subject Type: | Mammal |
| Subject Species: | Mus musculus |
| Taxonomy ID: | 10090 |
| Genotype Strain: | C57BL/6 |
| Age Or Age Range: | 8-10 weeks old |
| Gender: | Male and female |
| Animal Feed: | ad libitum |
| Animal Water: | ad libitum |
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Sample Preparation:
| Sampleprep ID: | SP001410 |
| Sampleprep Summary: | After lung collection, 1 mL of 50 % methanol was added to 100 mg of Mtb-infected or uninfected lung tissue and homogenized in a dounce homogenizer to prepare a uniform suspension. For CE-TOF/MS, 200 uL of homogenate were mixed with 200 L of 0.2 M formic acid and vortexed for 2 min. The samples were cleared by centrifugation at 16000 x g for 10 min at 4 °C and the supernatant was filter-sterilized using 0.22 um spin-X columns (Sigma). For GC-QTOF/MS and LC-QTOF/MS, 200 uL of each sample homogenate were mixed with 800 L of 80:20 methanol:MTBE (Methyl tert-butyl ether) and vortexed for 2 min. Metabolites were then extracted for 1 h with shaking at room temperature and then centrifuged at 4000 x g at 20 °C for 20 min. Supernatants were sterile filtered using 0.22 um Spin-X columns. All samples were passed through a Millipore filter (30-kDa cutoff) to remove large proteins. Samples were dried under high vacuum and stored at -80 °C until further platform-specific processing and analysis. For CE-ESI(+)-TOF/MS analysis, The dried samples were resuspended in Milli-Q water containing 0.1 mM formic acid and 0.2 mM methionine sulfone (internal standard) (Sigma-Aldrich, Germany) by vortexing for 1 min. After subsequent centrifugation (12600 x g, 15 min), the resulting clear solution was analyzed. For GC-QTOF/MS analysis, The above described dried samples were re-suspended in 450 µL of MeOH:H2O:MTBE (74:10:16) and after centrifugation at 12600 x g, 15 min at 4 °C, the supernatant was transferred to a vial with insert and evaporated to dryness under high vacuum. The obtained dried extracts were derivatized by a MPS autosampler for GC/MS analysis as previously described (Fiehn O., 2006). For LC-QTOF/MS analysis, The above described dried samples were resuspended in 200 µL of methanol:water:MTBE (7.4:1:1.6), vortexed for 1.5 h and centrifuged (4000 x g, 10 min, 4 °C). Clear solutions were analyzed. |
| Sample Derivatization: | In GC-EI-QTOF/MS analyses, Briefly, aldehyde and keto groups were first converted to O-methyloximes by reaction with 10 µL pyridine containing 15 mg/mL O-methoxyamine (Sigma-Aldrich, Germany) for 60 min at 70 °C. In a second step, acid hydrogen-containing metabolites were trimethylsilylated by reaction with 10 µL N,O-Bis(trimethylsilyl)trifluoroacetamide (BSTFA) (Sigma-Aldrich, Germany) to enhance the GC/MS metabolite coverage |
