Media and tissue analyses were performed with a Waters 2690 HPLC instrument, using a Zorbax RX‐C18 250 mm × 4.6 mm column and a mobile phase composed of acetonitrile (ACN)/water: CP and BV (45% ACN in water for 15 min, increasing to 100% ACN after 16 min) and HV (40% ACN in water for 20 min, increasing to 100% ACN after 30 min), all at 1 ml min–1. Emission of UV light was detected using a Waters 486 UV detector at 240 nm (for CP and BV) and 244 nm (for HV) and the concentrations of these corticosteroids was calculated from standard calibration curves.
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