All of the extraction solutions and solvents used for the CoA extraction were precooled on ice. Powder frozen heart tissues (∼20 mg) were homogenized with 0.5 mL of methanol/water 4:1 using an electronic mixer for 30 s on ice. The tissue homogenates were centrifuged at 20,000 × g for 15 min at 4 °C. The clear supernatant was dried in a SpeedVac. The dried residue was stored at −80 °C until LC-MS analysis.
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