Simultaneous Determination of Four Compounds, Campesterol, Emodin8‑O‑β‑D‑Glucopyranoside, Quercetin, and Isoquercitrin in Reynoutria sachalinensis by High‑performance Liquid Chromatography‑Diode Array Detector

Background: Reynoutria sachalinensis is a well‑known and used herbal medicine to treatment of arthralgia, jaundice, amenorrhea, coughs, carbuncles, and sores. Objective: We have developed high‑performance liquid chromatography analysis method for simultaneous determination of isolated four compounds, campesterol, emodin8‑O‑β‑D‑glucopyranoside, quercetin, and isoquercitrin from R. sachalinensis is. Materials and Methods: The four compounds were separated on Shiseido C18 column (S‑5 µm, 4.6 mm I.D. ×250 mm) at a column temperature of 25°C. The mobile phase composed of water and methanol with gradient elution system, and flow rate is 1.0 ml/min. The detection wavelength was set at 205 nm. Results: Validation of this analytical method was evaluated by linearity, precision, and accuracy test. This established method had good linearity (R2 > 0.997). The relative standard deviation values of intra‑ and inter‑day testing were indicated that <2%, and accuracy is 91.66%–103.31% at intraday and 91.69%– 103.31% at intraday. The results of recovery test were 92.60%–108.99%. Conclusion: In these results, developed method was accurate and reliable to the quality evaluation of campesterol, emodin 8‑O‑β‑D‑glucopyranoside, quercetin, and isoquercitrin isolated from R. sachalinensis.