RESUMEN
BACKGROUND: Aconitum gymnandrum is a Chinese traditional herb used as carminative and analgesic. In this study, A. gymnandrum was used as an experimental matrix. MATERIALS AND METHODS: Optimized ultrasonic extraction technology of total flavonoids from the A. gymnandrum Maxim was studied by using the methodology of single factor and orthogonal design to study the effects of operation conditions, such as ethanol content, ultrasonic wave power, temperature, ultrasonic wave radiation time, and the ratio of sample weight to solvent volume. RESULT: THROUGH THE ORTHOGONAL EXPERIMENT, THE OPTIMAL EXTRACTION CONDITIONS WERE DETERMINED AS FOLLOWS: Ultrasonic power 100 W, ultrasonic temperature 45°C, 60% ethyl alcohol, extraction time 30 min, and solid-liquid ratio 1:20. CONCLUSION: Under the optimum parameters, the extraction ratio of total flavonoids from the A. gymnandrum Maxim is about 1.278%.
RESUMEN
The title compound, C6H4ClN3, is essentially planar, with a maximum deviation of 0.007â (3)â Å. In the crystal, a short contact of 2.818â (3)â Å is observed between N and Cl atoms of adjacent mol-ecules.
RESUMEN
The title compound, C(33)H(45)NO(10), has an aconitine carbon skeleton with four six-membered rings and two five-membered rings. The five-membered rings adopt envelope configurations and the six-membered N-containing heterocyclic ring displays a chair conformation. Two intra-molecular O-Hâ¯O hydrogen bonds occur.
RESUMEN
The title compound, C(27)H(40)O(4), was obtained from the oxidation of (25R)-3b-hydr-oxy-5a-spiro-stan-12-one (Hecogenin) by Jone's reagent. The mol-ecule contains six alicyclic and heterocyclic rings, all trans-fused, among which four six-membered rings adopt similar chair conformations while two five-membered rings assume an envelope conformation.