Identification method
[Microscopic identification]
Root Cross Section: The remaining plug layer is a number of cork cells. The cortex is narrow, scattered with roundish, triangular-like, square-like, rectangular or polygonal thick-walled cells with milk ducts. The phloem is broad, and the sieve group near the formation layer is more obvious; there is a milk tube. Layer formation loop. Xylem catheters are scattered in individual or several to more than 10 clusters and are arranged in a radial pattern. Rays are more than 2-10 rows wide and there are also a few milk tubes distributed. This product is a parenchyma cell containing starch grains.
Powder characteristics: almost white.
1 starch granules spherical or semi-circular, diameter 5-34μm, umbilical point-like, fissure-like or stellate; complex grain consists of 2-8 granules.
2 Non-adult milk ducts contain pale yellow fine particles.
3 Thick-walled cells are rectangular, prismatic, triangular-like or polygonal, with fine or non-wooden walls.
More than 4 wire line catheters are common, often accompanied by fiber bundles.
Physical and chemical identification
Take this product powder 1g, add ethanol 10ml, cold dip 24h, filtered. Take the filtrate 2ml, set the evaporating dish, evaporated on a water bath, add 1ml of acetic anhydride dissolved, the slurry solution was placed in a test tube, along the wall with concentrated sulfuric acid 1ml, the two liquid interface appears purple (check sterol).
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