Drug identification
Take this product powder 1g, add chloroform 20ml, heat reflux 0.5 hours, filtered, the filtrate evaporated, the residue was dissolved by chloroform 1ml, as the test solution. In addition, 1 g of control medicinal herbs from southern Schisandra was used as the reference drug solution. Then take the schisandra A reference substance and add chloroform to make a solution containing 1 mg per 1 ml as the reference solution. According to the TLC (Appendix VIB) test, 2 μl of each of the above three solutions was pipetted and spotted on the same silica gel GF254 thin plate with petroleum ether (30-60°C)-ethyl formate-formic acid (15:5: The upper solution of 1) is a developing solvent, which is developed, taken out, air-dried, and viewed under a UV lamp (254 nm). In the chromatogram of the test sample, spots of the same color appeared at the positions corresponding to the chromatograms of the reference drug and the reference substance.
Inspection: Impurities must not exceed 1%.
Determination of content: As determined by high performance liquid chromatography (Appendix VID). Preparation of reference solution Take about 25mg of schisandra ester A reference substance, accurately weighed, set in a 5ml volumetric flask, add methanol to dissolve and dilute to the mark, shake, and get (each schi containing 5mg of schisandra ester). Preparation of the test solution to take this product powder (over the No. 3 sieve) about 1g, accurately weighed, set the 20ml volumetric flask, add about 18ml of methanol, ultrasonic treatment for 20 minutes, let cool, add methanol to the mark, shake, Filtration, continuous filtrate, that is, too. Accurately draw the test solution, reference solution, and methanol each with 20 μl, and place three sets of plugs in test tubes. Sweep away the methanol, and accurately add 10% chromotropic acid aqueous solution 0.5 ml, sulfuric acid 3 ml, and water 1.5 ml, respectively. Shake well, set to heat in boiling water bath for 30 minutes, quickly cool, take the above methanol tube as blank, according to spectrophotometry (Appendix VB), absorbance at 570nm wavelength was measured, calculated, that is, too. This product contains total lignans calculated as schisandra ester A (C30H32O9), not less than 3.0%.
Rhodium powder Rh≥99.95% Properties: silver-white metal, extremely hard, wear-resistant, also has considerable ductility Application: It can be used as raw material for electrical instrumentation, chemical industry and manufacture of precision alloys. Rhodium powder is based on the widespread use of ruthenium in the industrial industry. Since rhodium is a rare metal required by the industry, the industry price is slightly higher than that of general non-ferrous metals. Rhodium, one of the rare elements, has various uses. Rhodium can be used to make hydrogenation catalysts, thermocouples, platinum-rhodium alloys, etc. It is also often plated on searchlights and reflectors, and is also used as a polishing agent for gemstones. and electrical contact parts.
precious metal
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