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The quantification was performed by high performance liquid chromatography (HPLC) (Shimadzu model LC20) coupled with a UV detector (274 nm). The mobile phase was acetonitrile and water (1:1) with a flow rate of 0.8 mL/min. Fifty microliters of the sample were injected. Chromatographic separation was accomplished using the column ODS Hipersil 250  4 mm, 5-lm particles. The mobile phase was an isocratic mixture of methanol: acetonitrile at a proportion of 1:1, and the flow rate was
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