Confirmation of schizandrin as a marker compound in Jangsu Omija powder

We studied the development of schizandrin as a marker compound in Jangsu Omija. Schizandrin was validated for its LOD (limit of detection), LOQ (limit of quantitation), precision, accuracy, and recovery by HPLC relative to Omija powder. It showed a high linearity in the calibration curve with a coefficient of correlation (R²) of 0.9990. The LOD and LOQ were 0.2 μg/mL and 0.5 μg/mL, respectively. The intra-and inter-day precision of schizan-drin calibration standards was 0.06~0.66% and 0.13~1.19%, respectively, and the intra-and inter-day accuracy of schizandrin was 98.35~103.30% and 98.35~103.00%, respectively. Overall, schizandrin was validated through our analytical methods as a marker compound in Jangsu Omija.