Extraction process of resveratrol from giant knotweed
A technology of resveratrol and Polygonum cuspidatum, which is applied in the field of preparation of resveratrol extracted from Polygonum cuspidatum plants, can solve the problems of unsatisfactory industrialization degree of yield and output, and achieve tight process, reduce consumption, and operate easy effect
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Embodiment 1
[0027] Grind the dried Polygonum cuspidatum raw material, use ethanol and ethyl acetate according to its volume ratio of 1:1 to combine heating and reflux extraction for 3 times, the amount of extraction solvent is respectively 3 times, 2 times and 1 time of the raw material according to its volume ratio, extract The time is 3: 2: 1 hour, combine the extracts and recover the organic solvent under reduced pressure, distill and concentrate to a thick paste; add 10 times the amount of water to the obtained thick paste according to its volume ratio, and heat it to the boiling point Stand still for 1 hour, pour out the supernatant when the temperature is not lower than 50°C, and concentrate to 30B°C (Baume degree); the obtained dilute solution with a Baume degree of 30B°C, according to its volume ratio, is respectively Add ethyl acetate in multiples of 3:2:2, extract three times and combine the extracts, adjust the pH value to 8.0 with concentrated ammonia water, let stand, filter, ...
Embodiment 2
[0029] Grind the dried Polygonum cuspidatum raw material, use ethanol and ethyl acetate according to its volume ratio of 1:1 to combine heating and reflux extraction for 3 times, the amount of extraction solvent is respectively 4 times, 3 times and 2 times of the raw material according to its volume ratio, extract The time is 3: 2: 1 hour, combine the extracts and recover the organic solvent under reduced pressure, distill and concentrate to a thick paste; add 15 times the amount of water to the obtained thick paste according to its volume ratio, and heat it to the boiling point Stand still for 2 hours, pour out the supernatant when the temperature is not lower than 50°C, and concentrate to 35B°C (Baume degree); the obtained diluted solution with a Baume degree of 35B°C, according to its volume ratio, is respectively Add ethyl acetate in multiples of 4:3:3, extract three times and combine the extracts, adjust the pH value to 9.0 with concentrated ammonia water, let stand, filte...
Embodiment 3
[0031] Grind the dried Polygonum cuspidatum raw material, use ethanol and ethyl acetate according to its volume ratio of 1:1 to combine heating and reflux extraction for 3 times, the amount of extraction solvent is respectively 5 times, 4 times and 3 times of the raw material according to its volume ratio, extract The time is 3: 2: 1 hour, combine the extracts and recover the organic solvent under reduced pressure, distill and concentrate to a thick paste; add 20 times the amount of water to the obtained thick paste according to its volume ratio, and heat it to the boiling point Stand still for 3 hours, pour out the supernatant when the temperature is not lower than 50°C, and concentrate to 40B°C (Baume degree); Add ethyl acetate in multiples of 5:4:4, extract three times and combine the extracts, adjust the pH value to 10.0 with concentrated ammonia water, let stand, filter, concentrate under reduced pressure to 1 / 20 of the volume of the extract, and crystallize The crude ext...
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