Gastrodia identification method
Identification method
1, some residual epidermal tissue. Cortical lateral single column to the number of cell wall slightly thickening, visible sparse wall hole; thick-walled cells polygonal or oval-like, often showing a bead-like thickening, micro-wood. The columnar parenchyma cells are larger, round or polygonal, and pits are sometimes seen. Vascular bundles are either external or tough, scattered, with two to several clusters of ducts, non-woody. In the parenchyma tissue, calcium oxalate needles were seen, and scattered in some; parenchyma cells containing polysaccharide masses, in the case of iodine liquid brown or light brown purple.
2, take the powder, made of 10% aqueous extract, add 2-4 drops of iodine test solution, significantly red to wine red.
3, take the powder, made of 10% ethanol (45%) dip, add 0.5ml of mercury nitrate test solution, heating, the solution was rose red, and a yellow precipitate.
4, take the powder, made of 5% ethanol leaching solution, under the ultraviolet light green fluorescent stone.
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