Technics for extracting lotus leaf flavone
A lotus leaf flavonoids and process technology, applied in the field of extracting lotus leaf flavonoids, to achieve the effects of reducing interference, enhancing adsorption capacity, and safe extraction methods
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Embodiment 1
[0024] The fresh lotus leaves harvested on site were washed, air-dried or dried, and crushed to obtain lotus leaf powder; 5 kg of lotus leaf powder was leached with 125 L of 60% ethanol aqueous solution at a temperature of 75 ° C for 40 minutes, and the filtrate was collected, and the filter residue was leached with 75 L Extract again with 60% ethanol, and combine the two filtrates; concentrate the extract under reduced pressure to about 50L, recover ethanol, and filter to remove water-insoluble impurities; extract the concentrated and filtered extract with 33.3L petroleum ether (boiling range 60°C) The two are 50,000 ultrafiltration membranes for ultrafiltration. The ultrafiltration process conditions are: operating temperature at room temperature, ultrafiltration pressure 0.15MPa, when the ultrafiltration retains the liquid, adjust the pH of the raffinate to 9, and filter to remove a small amount of precipitation; add 100L After diluting with water, reduce it to about 20L wit...
Embodiment 2
[0027] The fresh lotus leaves harvested on site were washed, air-dried or dried, and crushed to obtain lotus leaf powder; 5 kg of lotus leaf powder was leached with 150 L of 60% ethanol aqueous solution at a temperature of 70 ° C for 60 minutes, and the filtrate was collected, and the filter residue was leached with 50 L 60% ethanol was extracted again, and the filtrate was combined twice; the extract was concentrated under reduced pressure to about 50L, the ethanol was recovered, and water-insoluble impurities were removed by filtration; the concentrated and filtered extract was extracted with 35L petroleum ether (boiling range 60°C) Perform ultrafiltration for 50,000 ultrafiltration membranes. The ultrafiltration process conditions are: operating temperature at room temperature, ultrafiltration pressure 0.15MPa, when the ultrafiltration retains the liquid, adjust the raffinate to pH8, and filter to remove a small amount of precipitation that occurs; add 100L of water After di...
Embodiment 3
[0030] The fresh lotus leaves harvested on site were washed, air-dried or dried, and crushed to obtain lotus leaf powder; 5kg of lotus leaf powder was extracted with 125L of 50% ethanol aqueous solution at a temperature of 80°C for 40 minutes, and the filtrate was collected, and the residue was extracted with 50L of 50% ethanol was extracted again, and the filtrate was combined twice; the extract was concentrated under reduced pressure to about 40L, the ethanol was recovered, and water-insoluble impurities were removed by filtration; the concentrated filter extract was extracted with 40L petroleum ether (boiling range 60°C) Perform ultrafiltration for 50,000 ultrafiltration membranes. The ultrafiltration process conditions are: operating temperature at room temperature, ultrafiltration pressure 0.15MPa, when the ultrafiltration retains the liquid, adjust the pH of the raffinate to 9, and filter to remove a small amount of precipitation that occurs; add 100L of water After dilut...
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Abstract
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