Method for removing pesticide residues from China hemp extracts
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Embodiment 1
[0045] Flowchart such as figure 1 shown.
[0046] Step 1: Use a pulverizer to pulverize the hemp raw material (flower stems and leaves) to less than 0.1mm, and the water content is less than 3%.
[0047] The second step: 400 kilograms of pulverized raw materials (one-time loading in the solvent extraction equipment, extract with methanol of 25 times the weight and volume, and collect the methanol extract flowing out from the extraction equipment.
[0048] The third step: mix the methanol extract with water into a methanol solution containing 30% water, filter to remove insoluble matter, pump the clear liquid into the chromatographic system, and use 70% methanol aqueous solution (volume content) as the mobile phase for isocratic washing The flow rate is 2 times of the column volume; the effluent from the separation system is collected in sections, the effluent of the first 2 column volumes is a solution containing impurities and residual pesticides, and the effluent of the 3rd...
Embodiment 2
[0055] Flowchart such as figure 1 shown.
[0056] Step 1: Use a pulverizer to pulverize the hemp raw material to less than 0.1 mm, and the water content is less than 3%.
[0057] The second step: put 1000 kg of pulverized raw materials into the solvent extraction equipment at a time, extract with 25 times the weight and volume of ethanol, and collect the ethanol extract flowing out of the extraction equipment.
[0058] The third step: mix the ethanol extract with water into a solution containing 40% water, filter to remove insoluble matter, and pump the clear liquid into the chromatographic system, and use 60% ethanol water as the mobile phase for isocratic elution at a flow rate of 3 times the volume of the column; the effluent from the separation system is collected in sections, the effluent of the first 2 times of the column volume is a solution containing impurities and residual pesticides, and the effluent of the third to fourth column volume is the solution containing C...
Embodiment 3
[0065] Flowchart such as figure 1 shown.
[0066] Step 1: Use a pulverizer to pulverize the hemp raw material to less than 0.1 mm, and the water content is less than 3%.
[0067] The second step: put 500 kg of pulverized raw materials into the solvent extraction equipment at a time, extract with 25 times the weight and volume of heptane, collect the heptane extract flowing out of the extraction equipment; use the concentrator to recover the heptane to obtain the concentrate .
[0068] Step 3: Heat 60% ethanol water to 60°C to dissolve the concentrate, bring it to room temperature, filter to remove insoluble matter, pump the clear liquid into the chromatographic system, and use 60% ethanol water solution as the mobile phase for isocratic washing The flow rate is 2 times of the column volume; the effluent from the separation system is collected in sections, the effluent of the first 2 column volumes is a solution containing impurities and residual pesticides, and the effluent ...
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