Papers by Author: Yan Long Wang

Abstract: The method of using macro-porous absorption resin to rurify coumarins in “Yubaizhi” angelica dahurica was used in this study. A kind of better resin was chosen from D-101 resin and HPD600 resin by the comparison of adsorption rate, desorption rate and purity. The result showed that D-101 resin was better for purifying coumrins. Then these conditions of purifying were discussed. when the sample concentration was 0.1g medicinal materials per milliliter and the adsorbent speed was 1ml/min, the effect of adsorption was better. And per gram resin could adsorb coumarins of 3g sample material. When the eluotropic speed of 80% ethanol was 1ml/min and the dosage of eluent reaches was 7 multiple of bed volume, the effect of elution was better. The result of demonstration test showed the effect of purifying coumarin was better with above-mentioned conditions.

Abstract: The extraction of flavonoids from peony leaves was studied recently. We carried out a research on the optimum technology of extracting flavonoids by single and orthogonal factor experiment. Finally we found the optimum conditions were: the ultrasonic temperature is 60 degrees, the ultrasonic time is 20min, the ultrasonic power is 600w, solid-liquid ratio is 1:25. Under this condition, the yield of flavonoids was 1.47% and the content was 8.34%.