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A method of quantitative nuclear magnetic resonance spectroscopy (qNMR) for the determination of epigoitrin in Radix Isatidis decoction pieces was established based on solid phase extraction (SPE). The twice ultrasonic extraction method using pure water was used for fully extracting epigoitrin in sample, and then the extraction was enriched and concentrated by poly-Sery MCX SPE cartridge. The qNMR...
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