Metabolomics Workbench : NIH Data Repository

MB Sample ID: SA168847

Local Sample ID:	70
Subject ID:	SU001891
Subject Type:	Human
Subject Species:	Homo sapiens
Taxonomy ID:	9606

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Sample Preparation:

Sampleprep ID:	SP001897
Sampleprep Summary:	for GC-MS analysis, protein precipitation was achieved by mixing 1 volume of plasma with 3 volumes of cold (-20°C) acetonitrile, followed by methoximation with O-methoxyamine hydrochloride (15 mg/mL) in pyridine, and silylation with BSTFA:TMSC (99:1). Finally, 20 ppm of tricosane in heptane was added as internal standard (IS). For CE-MS analysis, 100 µL of plasma was mixed with 100 µL of 0.2 M formic acid containing 5% acetonitrile and 0.4 mM methionine sulfone as IS. The sample was transferred to a centrifree ultracentrifugation device (Millipore Ireland Ltd.,Carrigtohill, Ireland) with a 30 kDa protein cutoff for deproteinization through centrifugation (2000 g, 4 °C, 70 min). For LC-MS analysis, 100 µL of plasma was mixed with 300 µL of a cold mixture (-20°C) of methanol:ethanol (1:1, v/v) for deproteinization. Samples were centrifuged (13,000 g, 4°C, 20 min). After centrifugation, 100 µL of the supernatant was directly injected into the system.

Sampleprep ID:

SP001897

Sampleprep Summary:

for GC-MS analysis, protein precipitation was achieved by mixing 1 volume of plasma with 3 volumes of cold (-20°C) acetonitrile, followed by methoximation with O-methoxyamine hydrochloride (15 mg/mL) in pyridine, and silylation with BSTFA:TMSC (99:1). Finally, 20 ppm of tricosane in heptane was added as internal standard (IS). For CE-MS analysis, 100 µL of plasma was mixed with 100 µL of 0.2 M formic acid containing 5% acetonitrile and 0.4 mM methionine sulfone as IS. The sample was transferred to a centrifree ultracentrifugation device (Millipore Ireland Ltd.,Carrigtohill, Ireland) with a 30 kDa protein cutoff for deproteinization through centrifugation (2000 g, 4 °C, 70 min). For LC-MS analysis, 100 µL of plasma was mixed with 300 µL of a cold mixture (-20°C) of methanol:ethanol (1:1, v/v) for deproteinization. Samples were centrifuged (13,000 g, 4°C, 20 min). After centrifugation, 100 µL of the supernatant was directly injected into the system.