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5 protocols using n methyl n tert butyldimethylsilyl trifluoroacetamide mtbstfa

1

Metabolomics Sample Preparation Protocol

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Acetonitrile (ACN), methanol (MeOH), and ammonium acetate (NH4Oac), all LC–MS grade, were purchased from Fisher Scientific (Pittsburgh, PA). Ammonium hydroxide (NH4OH), O-methylhydroxylamine hydrochloride (MeOX), and N-Methyl-n-(tert-butyldimethylsilyl) trifluoroacetamide (MTBSTFA) were bought from Sigma-Aldrich (Saint Louis, MO). Deionized water was provided in-house by a water purification system from EMD Millipore (Billerica, MA). Phosphate buffered saline (PBS) was bought from GE Healthcare Life Sciences (Logan, UT). Standard compounds corresponding to measured aqueous metabolites/features were purchased from Sigma-Aldrich and Fisher Scientific. Lipid standards were purchased from Fisher Scientific, Sigma-Aldrich, and Avanti Polar Lipids (Alabaster, AL).
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2

Triclosan Quantification in Environmental Samples

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Methanol (MeOH) (HPLC grade), acetonitrile, ethyl acetate, and formic acid were purchased from Merck (Darmstadt, Germany). Triclosan (TCS) and triclosan 13C6 (TCS-13C6) were provided by Toronto Research Chemicals Inc. (North York, ON, Canada). Acetic anhydride and the silylation agent N-methyl-N-(tert-butyldimethylsilyl)-trifluoroacetamide (MTBSTFA) were provided by Sigma-Aldrich (Milwaukee, WI, USA). Individual stock standards of TCS and TCS-13C6 were prepared in MeOH. Further dilutions were made in the same solvent, and stored at − 20 °C. Calibration standards for DART were prepared in ethyl acetate from methanol stocks.
OASIS HLB cartridges (60 mg) were obtained from Waters (Milford, MA, USA), C18 was provided by Agilent (Wilmington, DE, USA), diatomaceous earth was provided by VWR Chemicals (Leicestershire, England), and 10-mL polypropylene syringes were purchased from Becton Dickinson (Franklin Lakes, NJ, USA).
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3

Characterization of PAHs and Standards

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Information for PAHs and deuterated or isotopically labelled standards, including abbreviations, is provided in the Supporting Information (Table A1). Solvents including: acetonitrile (ACN), acetone (Ace), ethyl acetate (EA), dichloromethane (DCM), hexane, and methanol (MetOH); all optima grade were purchased from Thermo Fisher Scientific (Santa Clara, CA). Toluene, dimethylsulfoxide (DMSO), N-methyl-N-(tert-butyldimethylsilyl) trifluoroacetamide (MTBSTFA), dithiobis-2-nitrobenzoic acid (DTNB), dithiothreitol (DTT), and 1,4-naphtoquinone were purchased from Sigma-Aldrich (Milwaukee, WI).
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4

Native PAHs Analytical Protocols

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Native stock solutions of unsubstituted PAHs (n = 21), OHPAHs (n = 38), OPAHs (n = 24), HMW-PAHs (n = 14), NPAHs (n = 23), and isotopically labeled standards were purchased from different vendors. All 120 PAHs studied and isotopically labeled standards, their abbreviations, and vendors are listed in the Supporting Information (Table S1 and S2). The solid-phase extraction (SPE) Bond Elut Si (20 g, 60 mL) cartridges were purchased from Agilent Technologies (New Castle, DE) and the ISOLUTE ENV+ cartridges (100 mg, 6mL) were purchased from Biotage (Charlotte, NC). All solvents (methanol (MetOH), hexane (Hex), ethyl acetate (EA), acetonitrile (ACN), acetone (Ace), and dichloromethane (DCM); all optima grade) and 20 mL clear glass vials were purchased from Thermo Fisher Scientific (Santa Clara, CA). Toluene (Tol) (≥ 99.9%) and the derivatizing agent N-methyl-N-(tert-butyldimethylsilyl) trifluoroacetamide (MTBSTFA) (>97%) were purchased from Sigma-Aldrich (Milwaukee, WI).
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5

PAHs and Isotopic Standards Protocol

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PAHs and isotopically labeled standards information, including abbreviations and vendors, is provided in the Supporting Information (Table S1). Solvents including: methanol (MetOH), hexane, ethyl acetate (EA), acetonitrile (ACN), acetone (Ace), and dichloromethane (DCM); all optima grade were purchased from Thermo Fisher Scientific (Santa Clara, CA). Toluene, dimethylsulfoxide (DMSO), and N-methyl-N-(tert-butyldimethylsilyl) trifluoroacetamide (MTBSTFA) were purchased from Sigma-Aldrich (Milwaukee, WI).
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