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2 protocols using bovine milk xanthine oxidase

1

Modulating Oxidative Stress in Ischemia-Reperfusion

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To evaluate the role of NO, spermine NONOate (NO donor), or 3-bromo-7-Nitroindazole (NOS inhibitor) (Cayman Chemical) was included in the perfusion medium with and without OGD. To evaluate the role of O2•−, hypoxanthine-xanthine oxidase (HX-XO) system was used to generate O2•−: Bovine milk xanthine oxidase (≥0.4 units/mg protein) and hypoxanthine (≥99.0%) was obtained from Sigma. O2•− was decreased by the addition of the superoxide dismutase (SOD) mimetic 4-hydroxy-2,2,6,6-tetramethylpiperidine-N-oxyl (TEMPOL) obtained from Sigma-Aldrich Corp. FeTMPyP (Cayman Chemical), a synthetic porphyrin complexed with iron is an ONOO decomposition catalyst and was used to decrease peroxynitrite in the microchamber.
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2

Synthesis and Characterization of Novel Acetylcholinesterase Inhibitors

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Human monoamine oxidase A and B, bovine milk xanthine oxidase, kynuramine, xanthine, donepezil, clorgyline, selegiline, and allopurinol were purchased from Sigma-Aldrich (Milan, Italy).
HT hybrids were synthesized, purified, and analyzed as previously reported [49 (link)]. The set was composed of the following seven new compounds: 3,4-dihydroxyphenetyl 1-benzylpiperidine-4-carboxylate (HT1) and its peracetylated form (HT1a), 4,5-dihydroxy-2-nitrophenethyl 1-benzylpiperidine-4-carboxylate (HT2), 4-hydroxy-3-methoxyphenethyl 1-benzylpiperidine-4-carboxylate (HT3) and its peracetylated form (HT3a), and 4-hydroxyphenethyl 1-benzylpiperidine-4-carboxylate (HT4) and its peracetylated form (HT4a). A 50 mM stock solution of each compound was prepared in DMSO.
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