Identification (1) The product has a yellow powder. The pollen grains are round or elliptic and have a diameter of 17 to 29 μm. The surface is reticularly glyphed. The surrounding contour line is smooth, convex or gear-like, with a single hole, not very obvious. (2) Take 2g of this product powder, add 80% ethanol 30ml, heat to reflux for 1 hour, filter, the filtrate evaporated, the residue plus ethyl acetate 10ml, heated to dissolve, filtered, the filtrate was concentrated to about 2ml, as a test Product solution. Another isorhamnetin reference substance was added, and ethyl acetate was added to prepare a solution containing 1 mg per 1 ml as a reference solution. According to the thin layer chromatography (Appendix VI B) test, draw the test solution 10 ~ 15μl, the reference solution 5μl, respectively, point on the same silica gel GF254 thin plate, with toluene - ethyl acetate - formic acid (5:2: 1) For developer, unfold, remove, dry, and inspect under UV light (254nm). In the chromatogram of the test sample, the spots of the same color appear on the positions corresponding to the chromatogram of the reference substance. (3) Take 2g of the product powder, add 80% ethanol 50ml, cold soak for 24 hours, filter, the filtrate evaporated, the residue was dissolved in 5ml water, filtered, the filtrate was saturated with n-butanol extraction 2 times (each 5ml The extracts were combined, concentrated to dryness, and the residue was dissolved in 2 ml of ethanol to prepare a test solution. Another isorhamnetin-3-O-neo-total neocoridine and civetin glucoside reference substance, and ethanol was added to prepare a solution containing 1 mg each as a reference solution. According to the thin layer chromatography (Appendix VI B) test, draw the test solution 5 ~ 10μl, the reference solution 5μl, respectively, point on the same silica gel GF254 thin plate, with ethyl acetate - butanone - formic acid - water (5 : 3:1:1) as a developing agent, unfolded, removed, air-dried, and viewed under a UV light (254 nm). In the chromatogram of the test sample, the spots of the same color appear on the positions corresponding to the chromatogram of the reference substance. Lung Function Meter Filter,Medical Spirometry Filter,Spirometry Bacterial Filter,Disposable Lung Function Meter Filter Hengshui Qifei Paper Products Co. LTD , https://www.hengshuiqifei.com