Character identification
The branches are reel-like or trough-like, 10-60cm long and 1.5-3mm thick. The outer surface is grayish white, grayish brown to blackish brown, or alternately patchy, flat or slightly rough, with greyish white dot-like lenticels and finely slanting wrinkles, some with branching marks; the inner surface is yellowish-white or brownish, smooth. Hard and brittle, cross-sectional fiber, yellow-white. Odorless and bitter. Dry skin is a long strip of tablets, 3-6mm thick. The outer surface is gray-brown with red-brown round or horizontal lenticels and fissures. Hard quality, strong cross-section fiber. Microscopic identification of the bark cross section of the macrophylla: the cork layer is more than 5-10 rows of cells. The inner layer of the plug is a series of polygonal thick-cornered cells. The cortex is wide and the fibers or stone cells are scattered or clustered. In the occipital area there is a ring of stone cells and fiber bundles. The phloem ray has a width of 1-3 rows of cells; the bast fiber bundles are arranged in layers, with 2-10 rows of fibers per layer, with extremely thick fiber walls, punctiform cavities, and fibrous cells sometimes accompanied by stone cells. The product parenchyma cells contain most of the starch grains and calcium oxalate crystals.
Physical and chemical identification
1. Take a little herbs, soaked in heated water, the leaching solution can be seen in the blue light blue fluorescence. (Check horse chestnut bark and horse chestnut tree in prime)
2. Take powder 1g, add 95% ethanol 10ml, reflux 10min, filtered, take 2 drops of alcohol solution into the test tube, add 10ml of water to dilute, and show sky blue fluorescence under the reflected light (check the chestnut bark of horse chestnut). Another alcohol solution 1ml, plus 1% ferric chloride test solution 2-3 drops, dark green, and then add 3 drops of ammonia solution, diluted with 5 times the water, the light was observed dark red. (check horse chestnut bark)
3. Thin-layer chromatography to take powder 1g, add ethanol 10ml, heated to reflux for 10min, let cool, filtered, the filtrate as a test solution. Another horse chestnut bark and horse chestnut bark, plus ethanol made per 1ml each containing 5mg mixed solution as a reference solution. 3 μl of each of the above two solutions was pipetted on the same silica gel G plate, and toluene-ethyl acetate-formic acid-ethanol (3:4:1:2) was used as a developing agent to expand, remove, and air-dry. Ultraviolet light (365nm) view. In the chromatogram of the test sample, fluorescent spots of the same color appear on the positions corresponding to the chromatogram of the reference substance.
Determination of the content of the reference solution Preparation Weigh accurately 20 mg of apigenin reference substance dried at 80°C to a constant weight, place in a 10 ml volumetric flask, add the appropriate amount of ethanol, shake to dissolve, if necessary, add lukewarm heat, let cool, and add ethanol. To the scale, shake, that is, too. Preparation of the standard curve Precisely draw the control solutions 30μl, 50μl, 70μl, 90μl and 110μl. In accordance with the thin layer chromatography (Appendix VIB) test, the starting points of the silicone G thin layer plate were spotted into 3 to 5cm strips ( According to the amount of spotting, use n-butanol-chloroform-toluene-formic acid (8:1:1:1) as the developer, unfold it, remove it, dry it, and set it under UV light (365nm). The control strips were scraped with a stoppered Erlenmeyer flask. At the same time scrape off the same thin layer plate with the lower end of the strip of silica gel G as a blank area, set another plug Erlenmeyer flask, the bottles are accurately added to ethanol 10ml, 45 °C water bath carefully heated for 30 minutes, let cool, filter , Continue to the filtrate, according to the spectrophotometric method (Appendix VA), absorbance measured at 336nm wavelength, absorbance for the ordinate, concentration for the abscissa, to draw a standard curve.
Determination method to take the product powder (through the No. 3 sieve) about 1g, accurately weighed, set 50ml stoppered Erlenmeyer flask, accurately add ethanol 10ml, weighed, heat reflux for 30 minutes, let cool, and then weighed, With ethanol to make up for the lost weight, shake, filter, and take the filtrate as the test solution. According to the thin layer chromatography (Appendix VIB) test, 50 μl of the sample solution was accurately drawn, and a 5 cm long strip was formed along the starting line of the silica gel G thin plate, and 5 μl of the control solution was precisely pipetted to spot the test article. One side of the plaque was 1.5 cm apart as a control. The UV lamp (365nm) is viewed, and the stripe in the chromatogram of the test sample corresponding to the spot in the chromatogram of the reference product is scraped off, and the method under the preparation of the standard curve is used, and the method is as follows: From the beginning, according to law to determine the degree of absorption, from the standard curve to read out the weight of apigenin in the test solution, calculated, that is, too.
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