Giant knotweed rhizome active ingredient emodin extraction method
A technology of active ingredients and extraction methods, which is applied in the field of extracting emodin active ingredients from Polygonum cuspidatum by adopting a tank group countercurrent process, can solve the problems of low extraction efficiency, long extraction time, and large amount of solvent, and achieve high extraction efficiency and high extraction rate. High, extraction time saving effect
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Embodiment 1
[0012] 1. Reverse gradient extraction
[0013] see figure 1 1. Pulverize the knotweed medicinal material, weigh a certain amount and put it into five extraction tanks, add the extraction solvent into the E tank, select 35% to 70%, 8 to 12 times the volume of ethanol solution, and the temperature rises to 35 to 65 ° C, Extract for 20-50 minutes. After the extraction is completed, transfer the extract in tank E to tank D, add fresh solvent to tank E, raise the temperature to 35-65°C, and extract for 20-50 minutes. After the extraction, transfer the extract in tank D to tank C, transfer the extract in tank E to tank D, add fresh solvent to tank E, raise the temperature to 35-65°C, and extract for 20-50 minutes . After the extraction, transfer the extract in tank C to tank B, transfer the extract in tank D to tank C, transfer the extract in tank E to tank D, and add fresh solvent to tank E , the temperature rises to 35-65°C, and the extraction takes 20-50 minutes. After the e...
Embodiment 2
[0021] Crush the medicinal material of Polygonum cuspidatum, weigh 10g each into five extraction tanks A, B, C, D, and E, add 8 to 12 times the volume, 35 to 70% ethanol solution into tank E, and raise the temperature to 35 to 70%. At 65°C, extract in stages for 20-50 minutes. Orthogonal experiment was designed, the factor levels are shown in Table 1, and the extraction was carried out according to the operating points of "reverse gradient extraction" and "countercurrent extraction". After the extraction is completed, the extracts are combined, the volume is measured, and samples are taken to analyze the content of emodin. See Table 2 for the results.
[0022]
[0023] test
Embodiment 3
[0025] (1) Optimum tank group countercurrent process extraction
[0026] Crush the medicinal material of Polygonum cuspidatum, weigh 10g each into five extraction tanks A, B, C, D, and E, add 10 times the volume, 70% ethanol solution to tank E, raise the temperature to 65°C, and extract in stages for 35 minutes . Extract according to the operating points of "reverse gradient extraction" and "countercurrent extraction". After the extraction is completed, the extracts are combined, the volume is measured, and samples are taken to analyze the content of emodin.
[0027] (2) Hot reflux extraction
[0028] Weigh 10g of Polygonum cuspidatum into a 250mL round bottom flask, add 100mL of 70% medicinal alcohol, install a condenser, reflux at 90°C for 2 hours, cool rapidly, filter and separate the medicinal material from the extract, and add 100mL of 70% medicinal alcohol, continue to reflux for 2 hours, combine the extracts, and measure the emodin content in the extracts.
[0029] ...
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