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15n5 8 ohdg

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15N5-8-OHdG is a stable isotope-labeled compound used as an internal standard for the quantification of 8-hydroxy-2'-deoxyguanosine (8-OHdG), a biomarker of oxidative DNA damage, in various biological samples. It provides an accurate and precise measurement of 8-OHdG levels when used in conjunction with analytical techniques such as liquid chromatography-tandem mass spectrometry (LC-MS/MS).

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5 protocols using 15n5 8 ohdg

1

Quantification of Oxidative Stress Biomarkers

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8-OHdG (≥98%) (2-amino-9-[(2R,4S,5R)-4-hydroxy-5-(hydroxymethyl)oxolan-2-yl]-1,7-dihydropurine-6,8-dione) in a solid form was obtained from Merck (Buchs, St. Gallen, Switzerland). [15N5]-8-OHdG as internal standard (IS) was obtained from Cambridge Isotope Laboratories (Tewksbury, MA, USA). 8-Isoprostane ((5Z,8β,9α,11α,13E,15S)-9,11,15-trihydroxyprosta-5,13-dien-1-oic acid) in a solution ≥ 95%, and its deuterated IS 8-Isoprostane-d4 ((5Z,8β,9α,11α,13E,15S)-9,11,15-trihydroxyprosta-5,13-dien-1-oic-3,3,4,4-d4 acid), were obtained from Cayman Chemical (Ann Arbor, MI, USA). HPLC grade methanol (≥99.9%) was obtained from Merck (Buchs, Switzerland). LC-MS grade solvents; methanol (≥99.95%) and acetonitrile (≥99.9%) were obtained from Carlo Erba Reagents (Chaussée du Vexin, Val de Reuil, France). Butylated hydroxytoluene (BHT) ≥ 99% was obtained from Sigma-Aldrich Produktions GmbH (Steinheim Germany). LC–MS grade acetic acid was obtained from Honeywell (Seelze, Germany). Ultrapure water was produced in our laboratory with a Milli-Q Advantage water purification system (18.2 MΩ.cm at 25 °C, <3 ppb total organic carbon).
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2

Quantifying Oxidative Stress Biomarkers

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o,o’-dityrosine (diY) (>99%) was purchased from Toronto Research Chemicals (Toronto, Ontario, Canada). 8-hydroxy-2’-deoxyguanosine (8-OHdG) (≥98%), malondialdehyde tetrabutyl-ammonium salt, acetic acid, n-hexane, LC-MS grade methanol and water, acetonitrile, ethyl acetate, and synthetic urine were purchased from Sigma Aldrich (St. Louis, MO, USA). 8iso-prostaglandin F (8-PGF) (>99%), 15(R)-prostaglandin F (15-PGF) (>98%), 8-iso15(R)-prostaglandin F (8,15-PGF) (>98%), 11β-prostaglandin F (11-PGF) (>98%), and the internal standards (IS) for F2-isoprostanes, D4-8-iso-prostaglandin F (D4-8-PGF) (>99%), were purchased from Cayman Chemicals (Ann Arbor, MI, USA). 2,4–1,1,3,3-, tetraethoxypropane-1,3-d2 (>98%) (IS for MDA) was purchased from C/D/N isotopes (PointClair, Quebec, Canada). 13C12-o,o’-dityrosine (IS for diY) and 15N5-8-OHdG (IS for 8-OHdG) were purchased from Cambridge Isotope Laboratories (Andover, MA, USA). Derivatization reagent 2,4-dinitrophenylhydrazine (DNPH) was purchased from Spectrum (New Brunswick, NJ, USA).
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3

Oxidative Stress Biomarkers Analysis

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For this study, 8-OHdG was purchased from Sigma-Aldrich (St. Louis, MO, USA); 15N5-8-OHdG was obtained from Cambridge Isotope Laboratories, Inc. (Andover, MA, USA), and 8-iso-PGF2α and 8-iso-PGF2α-d4 were from Cayman Chemicals Co. (Ann Arbor, MI, USA). Amicon® ultracentrifugal filters (Ultracel®-30 K) were purchased from Merck Millipore, Ltd. (Cork, Ireland), and Sep-Pak® C18 solid-phase extraction (SPE) cartridges (3 cc, 500 mg) were purchased from Waters (Milford, MA, USA). Purified water was obtained from the Milli-Q® Integral system (Merck Millipore Ltd., Cork, Ireland). All other chromatography-grade chemicals were obtained from Sigma-Aldrich.
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4

Quantification of Oxidative Stress Biomarkers

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HNE-MA (1mg in 100 μl ethanol), HNE-MA-d3 (100 μg in 100 μl ethanol), 8-isoPGF, and 8-isoPGF-d4 were purchased from Cayman Chemicals (Ann Arbor, MI, USA). Maleic anhydride, 8-OHdG, and 7.5M of ammonium acetate solution (NH4Ac(aq)), 0.1 N sodium hydroxide (NaOH) standard solutions, and were purchased from Sigma–Aldrich (St. Louis, MO, USA). The internal standard, 15N5-8-OHdG (99% purity), was acquired from Cambridge Isotope Laboratories (Andover, MA, USA). Unlabeled 8-NO2Gua and its internal standard, 8-NO2Gua-4, 8-13C2-7-15N, were obtained from Santa Cruz Biotech (Santa Cruz, CA, USA). HPLC-grade methanol (MeOH) was procured from MACRON Chemicals (Center Valley, PA). For all subsequent steps, Milli-Q water was produced by a Millipore Elix 10 RO system and a Millipore Synergy UV system (Millipore SAS, Molsheim, France).
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5

Quantification of Oxidative Stress Markers

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8-OHdG and HPLC-grade methanol were obtained from Sigma-Aldrich (St. Louis, MO, USA), HNE-MA was obtained from Zzstandard (Shanghai Zzbio Co. Ltd., Shanghai, China), the internal standards 15 N5-8-OHdG (25 μg/ml in water, 98% purity) and HME-NA-d3 (>98% purity) were obtained from Cambridge Isotope Laboratories (Andover, MA, USA), and 8-isoPGF and its internal standard 8-isoPGF-d4 were obtained from Cayman Chemicals (Ann Arbor, MI, USA). Purified water was obtained using a Milli-Q system (Millipore, Bedford, MA, USA). Ammonium acetate was purchased from Sinopharm Chemicals (Shanghai, China).
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