UV detection was set at 520 nm using a Gemini C18 ODS (4.0 mm 4.6 mm i.d.) (Phenomenex Inc. Torrance CA, USA) fitted with a Gemini C6 ODS column (4.0 mm 3.0 mm i.d.) (Phenomenex Inc. Torrance CA, USA) guard column.
UV detection was set at 520 nm using a Gemini C18 ODS (4.0 mm 4.6 mm i.d.) (Phenomenex Inc. Torrance CA, USA) fittedwith a Gemini C6 ODS column (4.0 mm 3.0 mm i.d.) (Phenomenex Inc. Torrance CA, USA) guard column.