Summary of Study ST002391

This data is available at the NIH Common Fund's National Metabolomics Data Repository (NMDR) website, the Metabolomics Workbench, https://www.metabolomicsworkbench.org, where it has been assigned Project ID PR001538. The data can be accessed directly via it's Project DOI: 10.21228/M8WH85 This work is supported by NIH grant, U2C- DK119886.

See: https://www.metabolomicsworkbench.org/about/howtocite.php

This study contains a large results data set and is not available in the mwTab file. It is only available for download via FTP as data file(s) here.

Study ID	ST002391
Study Title	Evaluation of Two Simultaneous Metabolomic and Proteomic Extraction Protocols Assessed by Ultra-High-Performance Liquid Chromatography Tandem Mass Spectrometry
Study Summary	Untargeted multi-omics analysis of plasma is an emerging tool for the identification of novel biomarkers for evaluating disease prognosis and for a better understanding of molecular mechanisms underlying human disease. The successful application of metabolomic and proteomic approaches relies on reproducibly quantifying a wide range of metabolites and proteins. Herein, we report the results of untargeted metabolomic and proteomic analyses from blood plasma samples following analyte extraction by two frequently used solvent systems: chloro-form/methanol and methanol-only. Whole blood samples were collected from participants (n=6) at University Hospital Sharjah (UHS) hospital, then plasma was separated and extracted by two methods i. methanol precipitation and, ii. 4:3 methanol:chloroform extraction. The coverage and reproducibility of the two methods were assessed by ultra-high-performance liquid chromatography-electrospray ionization quadrupole time-of-flight mass spectrometry (UHPLC-ESI-QTOF-MS). The study revealed that metabolite extraction by methanol-only showed greater reproducibility for both metabolomic and proteomic quantifications than did methanol/chloroform, while yielding similar peptide coverage. However, coverage of extracted metabolites was higher with the methanol/chloroform precipitation.
Institute	Sharjah Institute for Medical Research
Last Name	Facility
First Name	Core
Address	M32, SIMR, College of Pharmacy, Health Sciences, University of Sharjah
Email	tims-tof@sharjah.ac.ae
Phone	065057656
Submit Date	2022-12-06
Raw Data Available	Yes
Raw Data File Type(s)	d
Analysis Type Detail	LC-MS
Release Date	2023-01-06
Release Version	1

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Sample Preparation:

Sampleprep ID:	SP002486
Sampleprep Summary:	Sample preparation 2.3.1Methanol precipitation for metabolomic extraction. 100 µL from each plasma sample was transferred to Eppendorf, then a volume of 300 µL of methanol was added to the aliquot. Samples were vortexed, then chilled at -20 °C for 2 hours followed by centrifugation (14000 rpm, 15 minutes, 24°C) to precipitate protein. The metabolite-containing supernatants were collected and transferred to glass vials for dry-ing using the EZ-2 Plus (GeneVac, Ipswich, UK) at 40 ±1°C and the protein pellets that remained were air dried for proteomics (see section 2.4). Dried metabolite samples were resuspended with 200 µl (0.1% formic acid in water), and vortexed for 2 min. The samples were filtered using a hydrophilic nylon syringe filter (0.45 μm pore size) and placed with-in glass inserts prior to being analyzed by Q-TOF MS. 4.3.2 Methanol: chloroform for metabolomic extraction. 100 µL from each sample was transferred to Eppendorf, then a volume of 400 µL of methanol and 300 µL of chloroform was added to the aliquot. Samples were vortexed then centrifuged (14000 rpm, 15 minutes, 24°C). Two metabolite-containing layers, an upper aqueous- and lower organic phase, were obtained separated by a thin white proteinaceous disc. The upper layer for each sample was transferred to glass vials and a volume of 400 µL of methanol was added, followed by vortexing and centrifugation to pellet the protein disc, after which the remaining supernatant was transferred to the same glass vials as be-fore for drying step and the protein pellets that remained were air dried for proteomics. Dried metabolomics samples were resuspended with 200 µL (0.1% formic acid in water) to be injected into HPLC and analyzed by Q-TOF MS.

Sampleprep ID:

SP002486

Sampleprep Summary:

Sample preparation 2.3.1Methanol precipitation for metabolomic extraction. 100 µL from each plasma sample was transferred to Eppendorf, then a volume of 300 µL of methanol was added to the aliquot. Samples were vortexed, then chilled at -20 °C for 2 hours followed by centrifugation (14000 rpm, 15 minutes, 24°C) to precipitate protein. The metabolite-containing supernatants were collected and transferred to glass vials for dry-ing using the EZ-2 Plus (GeneVac, Ipswich, UK) at 40 ±1°C and the protein pellets that remained were air dried for proteomics (see section 2.4). Dried metabolite samples were resuspended with 200 µl (0.1% formic acid in water), and vortexed for 2 min. The samples were filtered using a hydrophilic nylon syringe filter (0.45 μm pore size) and placed with-in glass inserts prior to being analyzed by Q-TOF MS. 4.3.2 Methanol: chloroform for metabolomic extraction. 100 µL from each sample was transferred to Eppendorf, then a volume of 400 µL of methanol and 300 µL of chloroform was added to the aliquot. Samples were vortexed then centrifuged (14000 rpm, 15 minutes, 24°C). Two metabolite-containing layers, an upper aqueous- and lower organic phase, were obtained separated by a thin white proteinaceous disc. The upper layer for each sample was transferred to glass vials and a volume of 400 µL of methanol was added, followed by vortexing and centrifugation to pellet the protein disc, after which the remaining supernatant was transferred to the same glass vials as be-fore for drying step and the protein pellets that remained were air dried for proteomics. Dried metabolomics samples were resuspended with 200 µL (0.1% formic acid in water) to be injected into HPLC and analyzed by Q-TOF MS.