Determination of Epigoitrin in Radix Isatidis by Solid Phase Extraction-Quantitative Nuclear Magnetic Resonance Spectroscopy

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 result suggested that SPE was suitable as extender for qNMR determination of low-content composition in complex samples.