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MB Sample ID: SA172645

Local Sample ID:B9_WU350-367_d0
Subject ID:SU001926
Subject Type:Human
Subject Species:Homo sapiens
Taxonomy ID:9606

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Sample Preparation:

Sampleprep ID:SP001932
Sampleprep Summary:Participant plasma, which had been stored at -80°C upon collection, was thawed on ice. A 50 µL aliquot was transferred onto the solid-phase-extraction (SPE)-system CAPTIVA-EMR Lipid 96-wellplate (Agilent Technologies) before addition of 250 µL of acetonitrile containing 1% formic acid (v/v) and 10 µM internal standard (consisting of uniformly 13C and 15N labeled amino acids from Cambridge Isotope Laboratories, Inc). The samples were mixed for 1 min at 360 rpm on an orbital shaker at room temperature prior to a 10 min incubation period at 4°C. Afterwards, 200 µL 80% acetonitrile in water (v/v) were added to the samples. The samples were mixed on an orbital shaker (360 rpm) for an additional 10 min at room temperature. The samples were then eluted into a 96-deepwell collection plate by centrifugation (10 min, 57 x g, 4°C followed by 2 min, 1000 x g, 4°C). Polar eluates were stored at -80°C until the day of LC/MS analysis. The SPE-plates were then washed twice with 500 µL 80% acetonitrile in water (v/v). Lipids still bound to the SPE-material were then released into a second elution plate, in two elution steps applying 2x 500 µL 1:1 methyl tert-butyl ether:methanol (v/v) onto the SPE cartridge and centrifuging for 2 min at 1000 g and 4°C. The combined eluates were dried under a stream of nitrogen (Biotage SPE Dry Evaporation System) at room temperature and reconstituted with 100 µL 1:1 2-propanol:methanol (v/v) prior to LC/MS analysis.
Processing Storage Conditions:Described in summary
Extract Storage:Described in summary
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