Metabolomics Workbench : NIH Data Repository

MB Sample ID: SA290873

Local Sample ID:	20220119_Cowley3_OM_11_16-429_HILICneg
Subject ID:	SU002867
Subject Type:	Mammal
Subject Species:	Rattus norvegicus
Taxonomy ID:	10116

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Sample Preparation:

Sampleprep ID:	SP002873
Sampleprep Summary:	Plasma/Urine Metabolite Extraction. Metabolites were extracted from 20 µL of plasma and 20 µL of urine from each SD rat in the study according to standard operating procedures in the Mass Spectrometry and Protein Chemistry Service at The Jackson Laboratory34. Metabolites were extracted using 500 µL of an ice cold 2:2:1 methanol:acetonitrile:water (MeOH:ACN:H2O) buffer; the sample was part of the water fraction. Caffeine, 1-napthylamine, and 9-anthracene carboxylic acid were all added at 0.5 ng/ µL in the extraction buffer as internal standards. Each sample was then vortexed for 30 seconds on the highest setting, subject to one minute of mixing with the Tissue Lyser II in pre-chilled cassettes, and then sonicated at 30 Hz for 5 minutes of 30 seconds on 30 seconds off in an ice water bath. Samples were then placed in the -20°C freezer overnight (16 hours) for extraction. Following the extraction, samples were centrifuged at 21,000 x g at 4°C and supernatant from each metabolite extract was equally divided into five 2 mL microcentrifuge tubes. Each sample supernatant was divided into five equal volume aliquots, one for each of the four modes and the rest to create equal representation pools of all samples, one for each mode. Each aliquot was then dried down using a vacuum centrifuge for storage at -80°C until further use. Tissue Metabolite Extraction. Metabolites were extracted from 20 mg of kidney cortex and medulla from each SD rat in the study according to standard operating procedures in the Mass Spectrometry and Protein Chemistry Service at The Jackson Laboratory34 as described for the plasma and urine samples with slight modification. Metabolites were extracted using 1000 µL of an ice cold 2:2:1 methanol:acetonitrile:water (MeOH:ACN:H2O) buffer containing internal standards as above per 20 mg of sample to ensure the extraction equivalents were normalized. Each sample had a 5 mm stainless steel bead added, then were pulverized in extraction buffer for two minutes usingTissue Lyser II. Samples were then placed in the -20°C freezer overnight (16 hours) for extraction and the supernatant was collected as with the urine/plasma samples. Each sample supernatant was divided into five equal volume aliquots, one for each of the four modes and the rest to create equal representation pools of all samples, one for each mode. Each aliquot was then dried down using a vacuum centrifuge for storage at -80°C until further use.

Sampleprep ID:

SP002873

Sampleprep Summary:

Plasma/Urine Metabolite Extraction. Metabolites were extracted from 20 µL of plasma and 20 µL of urine from each SD rat in the study according to standard operating procedures in the Mass Spectrometry and Protein Chemistry Service at The Jackson Laboratory34. Metabolites were extracted using 500 µL of an ice cold 2:2:1 methanol:acetonitrile:water (MeOH:ACN:H2O) buffer; the sample was part of the water fraction. Caffeine, 1-napthylamine, and 9-anthracene carboxylic acid were all added at 0.5 ng/ µL in the extraction buffer as internal standards. Each sample was then vortexed for 30 seconds on the highest setting, subject to one minute of mixing with the Tissue Lyser II in pre-chilled cassettes, and then sonicated at 30 Hz for 5 minutes of 30 seconds on 30 seconds off in an ice water bath. Samples were then placed in the -20°C freezer overnight (16 hours) for extraction. Following the extraction, samples were centrifuged at 21,000 x g at 4°C and supernatant from each metabolite extract was equally divided into five 2 mL microcentrifuge tubes. Each sample supernatant was divided into five equal volume aliquots, one for each of the four modes and the rest to create equal representation pools of all samples, one for each mode. Each aliquot was then dried down using a vacuum centrifuge for storage at -80°C until further use. Tissue Metabolite Extraction. Metabolites were extracted from 20 mg of kidney cortex and medulla from each SD rat in the study according to standard operating procedures in the Mass Spectrometry and Protein Chemistry Service at The Jackson Laboratory34 as described for the plasma and urine samples with slight modification. Metabolites were extracted using 1000 µL of an ice cold 2:2:1 methanol:acetonitrile:water (MeOH:ACN:H2O) buffer containing internal standards as above per 20 mg of sample to ensure the extraction equivalents were normalized. Each sample had a 5 mm stainless steel bead added, then were pulverized in extraction buffer for two minutes usingTissue Lyser II. Samples were then placed in the -20°C freezer overnight (16 hours) for extraction and the supernatant was collected as with the urine/plasma samples. Each sample supernatant was divided into five equal volume aliquots, one for each of the four modes and the rest to create equal representation pools of all samples, one for each mode. Each aliquot was then dried down using a vacuum centrifuge for storage at -80°C until further use.