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MB Sample ID: SA021233

Local Sample ID:21mar12_40-r001.d
Subject ID:SU000442
Subject Type:Animal
Subject Species:Homo sapiens
Taxonomy ID:9606
Species Group:Human

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Sample Preparation:

Sampleprep ID:SP000449
Sampleprep Summary:Plasma quality-control samples used in the study were prepared from pooled plasma spiked with a selection of metabolites to mimic elevated levels of metabolites during I− (insulin withdrawn) condition. Plasma was spiked with a standard mixture (3:1 ratio of plasma to spiking solution) containing 100 μg/mL niacin, hypoxanthine, leucine, isoleucine, phenylalanine, tryptophan, citric acid, glucose, hippuric acid, and taurocholic acid dissolved in 1:1 acetonitrile/water. All plasma samples (200 μL) were thawed on ice at 4°C followed by deproteinization with methanol (1:4 ratio of plasma to methanol) and vortexed for 10 s, followed by incubation at −20°C for 2 h. The samples were then centrifuged at 15,871g for 30 min at 4°C. The supernatants were lyophilized (Savant, Holbrook, NY) and stored at −20°C prior to analysis. The samples were reconstituted in 50% H2O/acetonitrile and passed through a Microcon YM3 filter (Millipore Corporation). The supernatants were transferred to analytical vials, stored in the autosampler at 4°C, and analyzed within 48 h of reconstitution in buffer.
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