Method for enriching and purifying procyanidin in pine bark
A technology of proanthocyanidins and pine bark, applied in the direction of organic chemistry, can solve the problems of low extraction purity and low extraction rate, and achieve the effect of high extraction purity, large adsorption capacity, and obvious separation effect
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Embodiment 1
[0026] Embodiment 1: A kind of method that utilizes batch distillation-macroporous adsorption resin coupling method to enrich and purify proanthocyanidins in pine bark, its steps are as follows:
[0027] (1) Pass through a 60-mesh sieve after the dried pine bark is crushed, and extract by heating and refluxing with 10 times the volume of pine bark powder under reflux for 3 times, each for 2 hours;
[0028] (2) Suction filtration of the pine bark extract treated in step (1) to obtain the extract and reclaim the initial extract of the solvent under reduced pressure;
[0029] (3) Heat and dissolve the obtained primary extract with ethanol, add purified water with a volume 20 times the volume of the extract alcohol solution for extraction, then adjust its pH value to 2.0 with acid, leave it to stand, suction filter, and recover the solvent under reduced pressure Obtain the crude extract of proanthocyanidins;
[0030] (4) The obtained proanthocyanidin extract is adsorbed on a macr...
Embodiment example 2
[0035] Implementation case 2: a method for enriching and purifying proanthocyanidins in pine bark by means of batch distillation-macroporous adsorption resin coupling method, the steps are as follows:
[0036] (1) After the dry pine bark is pulverized, cross a 10-mesh sieve, and extract by heating and refluxing with 20 times the volume of pine bark powder under reflux for 4 hours;
[0037] (2) Suction filtration of the pine bark extract treated in step (1) to obtain the extract and reclaim the initial extract of the solvent under reduced pressure;
[0038] (3) Heat and dissolve the obtained initial extract with ethanol, add purified water whose volume is 10 times the volume of the extract alcohol solution for extraction, then adjust its pH value to 2.3 with acid, leave it to stand, suction filter, and recover the solvent under reduced pressure Obtain the crude extract of proanthocyanidins;
[0039] (4) The obtained proanthocyanidin crude extract is adsorbed with a macroporous...
Embodiment example 3
[0044] Implementation case 3: a method for enriching and purifying proanthocyanidins in pine bark by means of batch distillation-macroporous adsorption resin coupling method, the steps are as follows:
[0045] (1) Pass 80 mesh sieves after the dried pine bark is pulverized, and extract by heating and refluxing with 75% ethanol with 15 times the volume of pine bark powder for 6 hours;
[0046] (2) Suction filtration of the pine bark extract treated in step (1) to obtain the extract and reclaim the initial extract of the solvent under reduced pressure;
[0047] (3) heating and dissolving the obtained initial extract with ethanol, adding purified water whose volume is 15 times the volume of the extract alcohol solution for extraction, then adjusting its pH value to 2.5 with acid, standing, suction filtration, and recovering the solvent under reduced pressure Obtain the crude extract of proanthocyanidins;
[0048] (4) The obtained proanthocyanidin crude extract is adsorbed on a m...
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