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2 protocols using phosphodiesterase 2 from bovine spleen

1

Synthesis and Purification of DNA Standards

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(R)-NNN, (S)-NNN and racemic NNN were synthesized as described previously.19 , 20 POB-DNA standards and deuterium labeled internal standards were synthesized previously in our laboratory.17 (link), 21 (link)–23 (link) Puregene DNA purification solutions, proteinase K and RNase A were purchased from Qiagen (Valencia, CA). Calf thymus DNA and micrococcal nuclease (from Staphylococcus aureus) were from Worthington Biochemical (Lakewood, NJ). Phosphodiesterase II (from bovine spleen) was purchased from Sigma-Aldrich (St. Louis, MO). Alkaline phosphatase (from calf intestine) was obtained from Roche Diagnostics (Indianapolis, IN). All other chemicals were from Sigma-Aldrich or Fisher Scientific (Fairlawn, NJ).
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2

Analysis of DNA Oxidation Markers

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AAI was purchased from Sigma‐Aldrich. The LLC‐PK1 porcine cell line (ATCC® CL‐101™) was obtained from the American Type Culture Collection (ATCC). Dulbecco's modified Eagle medium (DMEM), phosphate‐buffered saline and trypsin‐EDTA were purchased from Gibco and fetal calf serum from Lonza BioWhittaker. dA, deoxyguanosine (dG), N,N‐dimethylformamide, zinc powder, phosphodiesterase I from Crotalus adamanteus (venom phosphodiesterase), phosphodiesterase II from bovine spleen (spleen phosphodiesterase), nucleus PI and alkaline phosphatase were purchased from Sigma‐Aldrich. Dimethyl sulfoxide (>99.9%) was obtained from Acros Organics. Acetonitrile (ACN; ULC/MS grade) was obtained from Biosolve BV. Formic acid and ethanol were obtained from VWR Merck.
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