Metabolomics Workbench : NIH Data Repository

MB Sample ID: SA220303

Local Sample ID:	PPL_PS_C
Subject ID:	SU002378
Subject Type:	Water sample

Select appropriate tab below to view additional metadata details:

Sample Preparation:

Sampleprep ID:	SP002384
Sampleprep Summary:	Cation-Exchange Solid Phase Extraction (CX-SPE) Sample Volume: 40 mLs Solid Phase Resin/Column: Strong cation-exchange resin (Dowex 50WX8; H+ form, 100-200 mesh, Sigma-Aldrich, Vienna, Austria) Solvents/Reagents: 1 M NH3, 3 M HNO3 Brief Procedure: 35 g of resin was added to a glass chromatography column with a fritted disk and a PTFE stopcock. The resin was equilibrated with 50 mL water, 100 mL of 1M NH3, 50 mL water, 100 mL 3M HNO3, and 50 mL H2O. The samples were acidified with HNO3 to pH 2 and heavy isotope-labeled internal standards added. The sample was loaded onto column, allowed to stand for 5 minutes, and then drained from the column. The column was then rinsed with 50 mL water. Approximately 200 mL of 1M NH3 was added to column. Ammonia eluted from column in 10 mL fractions. The pH of each fraction checked by dabbing a small drop of sample onto a pH strip with a combusted glass Pasteur pipette. The alkaline front (the 10 mL fraction where the pH increases from approximately 2-4 to 9-11), the fraction before, and the two fractions after were collected, combined, and dried down under N2 gas in a water bath of approximately 32 degrees C. Dried fractions were redissolved in 380 uL of water. 20 uL of isotope-labeled injection standards in water were added to the fractions. Columns were regenerated for reuse through the addition of 50 mL of water, 100 mL 3M HNO3, and 50 mL of water. When not in use, columns were stored completely filled with 0.01 M HNO3. Water was extracted alongside samples as methodological blanks. PPL-Solid Phase Extraction (PPL-SPE) Sample Volume: 40 mLs Solid Phase Resin/Column: Agilent Bond Elut PPL cartridge, 1 g bed mass, 6 mL volume Solvents/Reagents: methanol, 0.01 M HCl, Brief Procedure: Sample acidified with HCl to pH 2 and heavy isotope-labeled internal standards added. Column prepped by adding 1 cartridge volumes of each of methanol followed by 0.01 M HCl. Sample loaded onto columns using a peristaltic pump at a flow rate of 10 mL/min Column rinsed with 2 cartridge volumes 0.01 M HCl. Sample eluted with 1 cartridge volume methanol and dried down under N2 gas. Dried fractions were redissolved in 380 uL of water. 20 uL of isotope-labeled injection standards in water were added to the fractions. Water was extracted alongside samples as methodological blanks.

Sampleprep ID:

SP002384

Sampleprep Summary:

Cation-Exchange Solid Phase Extraction (CX-SPE) Sample Volume: 40 mLs Solid Phase Resin/Column: Strong cation-exchange resin (Dowex 50WX8; H+ form, 100-200 mesh, Sigma-Aldrich, Vienna, Austria) Solvents/Reagents: 1 M NH3, 3 M HNO3 Brief Procedure: 35 g of resin was added to a glass chromatography column with a fritted disk and a PTFE stopcock. The resin was equilibrated with 50 mL water, 100 mL of 1M NH3, 50 mL water, 100 mL 3M HNO3, and 50 mL H2O. The samples were acidified with HNO3 to pH 2 and heavy isotope-labeled internal standards added. The sample was loaded onto column, allowed to stand for 5 minutes, and then drained from the column. The column was then rinsed with 50 mL water. Approximately 200 mL of 1M NH3 was added to column. Ammonia eluted from column in 10 mL fractions. The pH of each fraction checked by dabbing a small drop of sample onto a pH strip with a combusted glass Pasteur pipette. The alkaline front (the 10 mL fraction where the pH increases from approximately 2-4 to 9-11), the fraction before, and the two fractions after were collected, combined, and dried down under N2 gas in a water bath of approximately 32 degrees C. Dried fractions were redissolved in 380 uL of water. 20 uL of isotope-labeled injection standards in water were added to the fractions. Columns were regenerated for reuse through the addition of 50 mL of water, 100 mL 3M HNO3, and 50 mL of water. When not in use, columns were stored completely filled with 0.01 M HNO3. Water was extracted alongside samples as methodological blanks. PPL-Solid Phase Extraction (PPL-SPE) Sample Volume: 40 mLs Solid Phase Resin/Column: Agilent Bond Elut PPL cartridge, 1 g bed mass, 6 mL volume Solvents/Reagents: methanol, 0.01 M HCl, Brief Procedure: Sample acidified with HCl to pH 2 and heavy isotope-labeled internal standards added. Column prepped by adding 1 cartridge volumes of each of methanol followed by 0.01 M HCl. Sample loaded onto columns using a peristaltic pump at a flow rate of 10 mL/min Column rinsed with 2 cartridge volumes 0.01 M HCl. Sample eluted with 1 cartridge volume methanol and dried down under N2 gas. Dried fractions were redissolved in 380 uL of water. 20 uL of isotope-labeled injection standards in water were added to the fractions. Water was extracted alongside samples as methodological blanks.