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Epinine was detected with a simple and disposable carbon fiber flow electrode after being separated by high‐performance liquid chromatography (HPLC). An alumina adsorption procedure was used for the extraction of epinine from urine samples. The extraction recoveries at 1, 3, and 6 μg/mL epinine concentration levels were 66.9 ± 3.7, 65.6 ± 3.3, and 67.0 ± 3.4%, respectively (n = 5). Linear responses to epinine in urine were obtained over the range of 0 to 10 μg/mL. The detection limit (signal‐to‐noise ratio = 5/1) for epinine in urine was 15 ng/mL.
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Hua et al. (1994) studied this question.
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