Thin-layer identification method for rehmannia medicinal material and traditional Chinese medicine preparation containing rehmannia

The invention discloses a radix rehmanniae medicinal material and a thin-layer identification method of a traditional Chinese medicine preparation containing radix rehmanniae, and relates to the technical field of quality control of traditional Chinese medicines. The thin-layer identification method comprises the following steps: (1) taking a sample to be detected, adding a solvent, carrying out ultrasonic treatment, filtering, evaporating filtrate to dryness, adding water to dissolve residues, extracting by using an organic solvent, combining organic solvent layers, evaporating to dryness, adding water to dissolve residues, adding D101 macroporous resin on an aqueous solution, eluting by using water until the solution is nearly colorless, eluting by using an ethanol solution with the pH value of 2-5, collecting eluent, evaporating to dryness, and collecting the eluent; adding methanol into the residues for dissolving to obtain a test solution; (2) taking a rehmannia reference medicinal material to prepare a