Alias: Rehmannia glutinosa, wild rehmannia, jug flower, mountain tobacco root
English name: RADIX REHMANNIAE
Source This product is the fresh or dried tuberous root of Rehmannia glutinosa Libosch. Excavate in autumn, remove reed heads, fibrous roots and sediment, and use fresh; or slowly bake Rehmannia to about 80% dry. The former is called "Xiandihuang" and the latter is called "Shengdihuang".
Characters Fresh Rehmannia glutinosa: spindle-shaped or strip-shaped, 8-24cm long and 2-9cm in diameter. The outer skin is thin, the surface is light red and yellow, with curved longitudinal wrinkles, bud scars, transversely long lenticels and irregular scars. Succulent, easily broken, the bark is yellowish-white on the cross-section, orange-red oil spots can be seen, the xylem is yellowish-white, and the vessels are arranged radially. Gas slightly, taste slightly sweet, slightly bitter.
Rehmannia glutinosa: mostly irregular lumps or oblong, swollen in the middle, slightly thin at both ends, some small, elongated, slightly flat and twisted, 6-12cm long and 3-6cm in diameter. The surface is brown-black or brown-gray, extremely shrunken, with irregular horizontal curves. Weight, the quality is soft and tough, not easy to break, the section is brown-black or jet-black, shiny and sticky. Odorless, slightly sweet taste.
Storage Fresh rehmannia is buried in sand to prevent freezing; raw rehmannia is placed in a ventilated and dry place to prevent mildew and moths.
Identification (1) Cross-section of this product: cork cell number sequence. The cortical parenchyma cells are loosely arranged; there are many secretory cells scattered, containing orange oil droplets; occasionally stone cells. The phloem is wider and has fewer secretory cells. The cambium forms a ring. The xylem rays are broad; the vessels are sparse and arranged radially. Rehmannia glutinosa powder is dark brown. Cork cells are light brown, rectangular in cross-sectional view, neatly arranged. Parenchyma cells are round-like and contain round-like nuclei. The secretory cells are similar in shape to ordinary parenchyma cells and contain orange-yellow or orange-red oil droplets. The diameter of the bordered pits and reticulated vessels is about 92 μm.
(2) Take 2g of this product powder, add 20ml of methanol, heat under reflux for 1 hour, let cool, filter, and recover methanol from the filtrate to 5ml as the test solution. Take another catalpol reference substance and add methanol to make a solution containing 0.5mg per 1ml, as the reference substance solution. According to the thin-layer chromatography (Appendix VI B) test, draw 5 μl of each of the above two solutions, and place them on the same silica gel G thin-layer plate respectively. Use chloroform-methanol-water (14:6:1) as the developing agent to develop Take it out, dry it, spray it with anisaldehyde test solution, and heat it at 105℃ until the spot color is clear. In the chromatogram of the test substance, there are spots of the same color at the position corresponding to the chromatogram of the reference substance.
Meridian: Return to the heart, liver and kidney meridians.
Nature and flavor Rehmannia glutinosa: sweet, bitter, cold.
Rehmannia glutinosa: sweet, cold.
Functions and indications: Rehmannia glutinosa: clearing away heat and promoting body fluid, cooling blood, and stopping bleeding. Used for febrile yin injury, dark tongue, polydipsia, rash, hematemesis, epistaxis, sore throat.
Rehmannia glutinosa: clears heat and cools blood, nourishes yin, and produces body fluid. It is used for fever disease with dark tongue and polydipsia, internal heat due to yin deficiency, fever due to steaming of the bones, internal heat to reduce thirst, hematemesis, epistaxis, and rash.
Usage and dosage: Fresh Rehmannia: 12～30g. Rehmannia glutinosa: 9～15g.
Excerpt: "Chinese Pharmacopoeia"
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