Summary of the invention
The object of the present invention is to provide a kind of from glutinous rehmannia the method for Separation of Water threose, the method is simple to operate, disengaging time is short, cost is low, the product purity that obtains is high, yield is high.
The present invention is achieved through the following technical solutions:
A kind of from glutinous rehmannia the method for Separation of Water threose, may further comprise the steps:
1) Rehmannia Root crude extract and water are pressed the solid-liquid ratio of 1g:3~7ml, fully behind the mixing, obtained sample solution;
2) with behind the aminopropyl bonded silica gel filling high pressure preparative liquid chromatography post, sample solution is splined on high pressure preparative liquid chromatography post, take the acetonitrile-water system as elutriant, with speed isorheic elution 30~40min of 10~200ml/min, the volume ratio of acetonitrile and water is (68~73) in the described elutriant: (27~32);
3) under detecting, the differential detector carries out Fractional Collections according to the chromatogram appearance time, when the corresponding peak of stachyose begins to rise, collect, finish five of whole peak height/a period of time to collect when this peak drops to, obtain the wood liquid glucose, with dry behind the wood liquid glucose concentrating under reduced pressure, obtain high purity stachyose.
Step 2) described loading adopts the gradation loading, each loading 10~20ml.
Drying is after the wood liquid glucose is concentrated into relative density and is 1.10~1.15 behind the described concentrating under reduced pressure of step 3), under 20~40 ℃, and vacuum-drying 20~40h.
Described aminopropyl bonded silica gel passes through activation treatment before use, at first, small-particle ball-type aminopropyl bonded silica gel and ethanol are pressed the solid-liquid ratio of 1g:2~3ml, fully obtained homogenate behind the mixing, after homogenate supersound process 30~40min removed bubble, be packed in the chromatographic column; Secondly, after the water pump pumping liquid is till the Silica Surface absence of liquid, be forced into 45~50bar, use the high flow rate elutriant, with the flow velocity of 200ml/min, rinse out the interior ethanol of post; At last, with the flow velocity of 100ml/min, flushing 1h, the aminopropyl bonded silica gel after obtaining activating.
Described pressurization is to adopt piston to carry out the substep pressurization, and the first step is pressurized to 15~20bar, then with behind the high flow rate elutriant flushing pillar 1h, is pressurized to 45~50bar again.
The described high flow rate elutriant elutriant that to be acetonitrile and water be made into by the volume ratio of 70:30.
The particle diameter of described small-particle ball-type aminopropyl bonded silica gel is 5~20 μ m, and the aperture is
After described high pressure preparative liquid chromatography post post effect reduces, be that 5% ammonia soln carries out wash-out regeneration with mass concentration, regeneration is rear carries out wash-out with pure water, is eluted in the effluent liquid without ammonium ion.
The internal temperature of described differential detector is made as 30 ℃, and outside temperature is made as 35 ℃.
Described Rehmannia Root crude extract is after Rehmannia Root is cleaned, section, add flooding 1~4h after, under 80~100 ℃, heating and refluxing extraction 1~5h behind extracting liquid filtering, gets filtrate; Add in the filtrate after dehydrated alcohol to ethanol content reaches 90%, under 0~4 ℃, leave standstill 10~14h after, under 3000~4000r/min, centrifugal 25~35min gets precipitation; After precipitation was dissolved in water, behind activated carbon decolorizing, behind the destainer concentrating under reduced pressure, under 25~30 ℃, after vacuum tightness reached 0.09~0.15Mpa, vacuum-drying 20~40h obtained the Rehmannia Root crude extract.
Compared with prior art, the present invention has following useful technique effect:
The present invention separates first Application in the extraction of stachyose with the high pressure preparative chromatography, use the aminopropyl bonded silica gel as column packing, the success separation obtains high purity stachyose, only use this a kind of chromatogram system of acetonitrile and water in the sepn process, carry out constant current constant speed Gradient elution, adopt differential detector on-line monitoring method separated product and impurity, accomplish accurate collection, the sepn process simple and fast, flash liberation just can achieve the goal, without any need for chemical treatment method, can not lose stachyose, can be directly, separate fast and obtain stachyose, and disengaging time is short, fractional dose is large, and yield reaches more than 85%, and the stachyose purity that obtains is up to more than 98%.
The waste material that the inventive method produces is few, and the post effect is high, and required effluent volume is little, and floor space is little, has reduced the consuming cost of whole technique, filler and solvent recoverable, and environmental friendliness is fit to suitability for industrialized production.
Embodiment
The present invention is described in further detail below in conjunction with concrete drawings and Examples, and the explanation of the invention is not limited.
The reagent that the present invention is used and laboratory apparatus
1, reagent: preparation is analytical pure with acetonitrile, ethanol, ammonia, and analyzing with acetonitrile is chromatographically pure, and water is the secondary redistilled water;
2, laboratory apparatus: the present invention has adopted the small-particle ball-type aminopropyl bonded silica gel filler of external import, can under high pressure use, the resolution of this aminopropyl bonded silica gel related impurities is near analysis mode HPLC, has simultaneously good Reusability ability, the major diameter preparative column is that imported from America (VARIAN) can be loaded high-pressure chromatographic column certainly, it is imported from America (VARIAN) that high pressure prepares liquid phase systems, preparation is imported from America (VARIAN) with differential refraction detector, automatically the fraction collection system is imported from America (VARIAN), and product analysis uses high performance liquid chromatograph to produce as the U.S. (Waters).
A kind of from glutinous rehmannia the method for Separation of Water threose, may further comprise the steps:
1) Rehmannia Root crude extract and water are pressed the solid-liquid ratio of 1g:3~7ml, fully behind the mixing, obtained sample;
2) with behind the aminopropyl bonded silica gel filling high pressure preparative liquid chromatography post, the sample gradation is splined on high pressure preparative liquid chromatography post, take the acetonitrile-water system as elutriant, with speed isorheic elution 20~40min of 10~200ml/min, the volume ratio of acetonitrile and water is (68~73) in the described elutriant: (27~32); Described gradation loading is each loading 10~20ml sample;
3) under the differential detector detects, carry out Fractional Collections, obtain the wood liquid glucose, will obtain high purity stachyose after the wood liquid glucose low-temperature reduced-pressure drying.
The Rehmannia Root crude extract that uses is after Rehmannia Root is cleaned, section, after adding flooding 1~4h, under 80~100 ℃, heating and refluxing extraction 1~5h collects extracting solution again, after the extracting solution filtered while hot, add dehydrated alcohol in the filtrate and shake up after contain the alcohol amount and reach 90%, low temperature was placed 10~14 hours, after taking out under 3000~4000r/min, centrifugal 25~35min, abandoning supernatant, throw out uses activated carbon decolorizing with water dissolution, behind the destainer concentrating under reduced pressure, under 20~40 ℃, when vacuum tightness reached 0.09~0.15Mpa, vacuum-drying 20~40h obtained the glutinous rehmannia crude extract.
Before the purified water threose, need to carry out chromatographic column loads, take by weighing an amount of aminopropyl bonded silica gel filler, press the solid-liquid ratio of 1g:2~3ml, adding is made homogenate with the abundant mixing of ethanol, after homogenate supersound process 30~50min removed bubble, pour in the gc column tube,, cover behind the flange and carry out the substep pressurization with piston until Silica Surface does not just have liquid with the vacuum pump pumping liquid, be pressurized to 15~20bar for the first time, then behind the elutriant flushing pillar 1h with high flow rate, be pressurized to again 45~50bar, continue with the activation of elutriant flushing pillar constant speed, stand-by; For obtaining best separating effect, it highly is about 25cm that pillar is loaded.
The Rehmannia Root crude extract is dissolved in the water, and the ratio of dissolving is about 1:3~7, then filters with filtering membrane, and the sample batch sampling high pressure preparative liquid chromatography system that dissolving is good carries out the constant speed Gradient elution, and elution time is 20~40min; Elutriant is comprised of acetonitrile and water two portions, and the Polarity Control of elutriant is between 10~20min at stachyose in the retention time in the high pressure chromatogram, and the flow velocity of whole preparation process remains between 10~200ml/min.
Product carries out Fractional Collections (30 ℃ of internal temperatures, 35 ℃ of outside temperatures) according to the chromatographic peak appearance time under the differential detector detects.In the chromatographic separation of the present invention, glucose, sucrose, fructose are in the leading portion of stachyose, and the peak type is relatively symmetrical, but the peak do not reach in baseline separation so the sepn process when beginning to rise at the peak and collect, and the peak drops to whole high five/for the moment to be finished to collect.
The stachyose elutriant of collecting in the chromatographic separation process, be concentrated into relative density 1.10~1.15(60 ℃ survey by Rotary Evaporators) time use vacuum-drying, under 20~40 ℃, vacuum tightness is under 0.09~0.15Mpa, vacuum-drying 20~40h, the powder that drying obtains, by high performance liquid chromatography quantitative analysis purity more than 98%.
Through chromatographic separation repeatedly, the separator column effect of high pressure preparative liquid chromatography post reduces, this moment, available quality concentration was that 5% ammonia soln carries out the counterflush preparative column, column flow rate is 10~20% of chromatographic separation flow velocity, then use pure water to wash away ammonia unnecessary on the chromatographic column, recover chromatographic column post effect.
Embodiment 1
A kind of from glutinous rehmannia the method for Separation of Water threose, may further comprise the steps:
1) in the open glass container of 5L, the ball-type aminopropyl bonded silica gel that adds the 10 μ m of 700g, add and analyze ethanol 2100mL, stir into homogenate, behind the ultrasonic 40min, pour ready diameter 5cm into, column length is that extracting liquid covers flange in the stainless steel chromatogram column jecket of 30cm, the elutriant that is made into by the volume ratio of 70:30 with acetonitrile and water, flow velocity with 200ml/min carries out wash-out, rinses out ethanol in the chromatographic column, carries out the substep pressurization with piston in the post, the first step is pressurized to 15bar, then behind the flow velocity flushing 1h with 100ml/min, be forced into again 50bar, activation;
2) after chromatographic column is ready to complete, taking by weighing Rehmannia Root crude extract 100g(stachyose content is 38.9%), be dissolved in the 500ml water, filter, high pressure prepares flow rate pump 50ml/min, sample introduction 10ml, take the volume ratio 68:32 of acetonitrile and water as elutriant, carry out the constant speed wash-out, (30 ℃ of internal temperatures, 35 ℃ of outside temperatures) detects whole elution process under the differential detector, observe chromatographic peak by software, referring to Fig. 1, rise at 15.8min stachyose product peak, collect by automatic fraction collector, collection time is that the stachyose peak began ascent stage 15.87 minutes, the stachyose peak whole peak height 1/5th that descends finishes to collect, and finishes this elution system behind the 30min, and 1 is glucose in the collection of illustrative plates, 2 is fructose, 3 is sucrose, and 4 is stachyose, and 5 is raffinose; Carry out the repetition sample introduction after this wash-out finishes and collect, until that the Rehmannia Root of preparation is slightly extracted sample feeding is complete;
3) collect liquid and in Rotary Evaporators, reclaim solvent, to relative density 1.10(60 ℃ survey), (vacuum tightness is 0.09~0.15Mpa to use vacuum-drying, temperature is not higher than 30 ℃) dry 20~40h, obtain dried powder 32.6g, by the high performance liquid chromatography quantitative analysis, referring to Fig. 2, stachyose content is 98.6%, and yield is 87.4%.
Embodiment 2
A kind of from glutinous rehmannia the method for Separation of Water threose, may further comprise the steps:
1) in the open glass container of 5L, the ball-type aminopropyl bonded silica gel that adds the 5 μ m of 200g, add and analyze ethanol 600mL, stir into homogenate, behind the ultrasonic 30min, pour ready diameter 1.5cm into, column length is that extracting liquid covers flange in the stainless steel chromatogram column jecket of 20cm, the elutriant that is made into by the volume ratio of 70:30 with acetonitrile and water, flow velocity with 200ml/min carries out wash-out, rinses out ethanol in the chromatographic column, carries out the substep pressurization with piston in the post, the first step is pressurized to 15bar, then behind the flow velocity flushing 1h with 100ml/min, be forced into again 45bar, activation;
2) after chromatographic column is ready to complete, taking by weighing Rehmannia Root crude extract 150g(stachyose content is 38.9%), be dissolved in the 900ml water, filter, high pressure prepares flow rate pump 100ml/min, sample introduction 20ml, take the volume ratio 70:30 of acetonitrile and water as elutriant, carry out the constant speed wash-out, (30 ℃ of internal temperatures under the differential detector, 35 ℃ of outside temperatures) detect whole elution process, observe chromatographic peak by software, rise at 14.6min stachyose product peak, collect by automatic fraction collector, collection time is that the stachyose peak began ascent stage 14.67 minutes, and the peak whole peak height 1/5th that descends finishes to collect.Finish this elution system behind the 40min, carrying out the repetition sample introduction collects, until the Rehmannia Root of preparation slightly to extract sample feeding complete, collect liquid and in Rotary Evaporators, reclaim solvent, to relative density 1.10(60 ℃ survey), (vacuum tightness is 0.09~0.15Mpa) under 25~30 ℃ to use vacuum-drying, dry 20~40h obtains dried powder 52.3g, by the high performance liquid chromatography quantitative analysis, stachyose content is 98.9%, and yield is 88.6%.
Embodiment 3
A kind of from glutinous rehmannia the method for Separation of Water threose, may further comprise the steps:
1) in the open glass container of 5L, the ball-type aminopropyl bonded silica gel that adds the 20 μ m of 700g, add and analyze ethanol 1800mL, stir into homogenate, behind the ultrasonic 35min, pour ready diameter 15cm into, column length is that extracting liquid covers flange in the stainless steel chromatogram column jecket of 35cm, the elutriant that is made into by the volume ratio of 70:30 with acetonitrile and water, flow velocity with 200ml/min carries out wash-out, rinses out ethanol in the chromatographic column, carries out the substep pressurization with piston in the post, the first step is pressurized to 15bar, then behind the flow velocity flushing 1h with 100ml/min, be forced into again 45bar, activation;
2) after chromatographic column is ready to complete, taking by weighing Rehmannia Root crude extract 100g(stachyose content is 38.9%), be dissolved in the 700ml water, filter, high pressure prepares flow rate pump 200ml/min, sample introduction 15ml, take the volume ratio 73:27 of acetonitrile and water as elutriant, carry out the constant speed wash-out, (30 ℃ of internal temperatures under the differential detector, 35 ℃ of outside temperatures) detect whole elution process, observe chromatographic peak by software, rise at 14.5min stachyose product peak, collect by automatic fraction collector, collection time is that the stachyose peak began ascent stage 14.56 minutes, and the peak whole peak height 1/5th that descends finishes to collect.Finish this elution system behind the 40min, carrying out the repetition sample introduction collects, until the Rehmannia Root of preparation slightly to extract sample feeding complete, collect liquid and in Rotary Evaporators, reclaim solvent, to relative density 1.15(60 ℃ survey), (vacuum tightness is 0.09~0.15Mpa) under 25~30 ℃ to use vacuum-drying, dry 20~40h obtains dried powder 47.9g, by the high performance liquid chromatography quantitative analysis, stachyose content is 98.3%, and yield is 87.9%.
Embodiment 4
A kind of from glutinous rehmannia the method for Separation of Water threose, may further comprise the steps:
1) in the open glass container of 5L, the ball-type aminopropyl bonded silica gel that adds the 10 μ m of 700g, add and analyze ethanol 1400mL, stir into homogenate, behind the ultrasonic 35min, pour ready diameter 8cm into, column length is that extracting liquid covers flange in the stainless steel chromatogram column jecket of 40cm, the elutriant that is made into by the volume ratio of 70:30 with acetonitrile and water, flow velocity with 200ml/min carries out wash-out, rinses out ethanol in the chromatographic column, carries out the substep pressurization with piston in the post, the first step is pressurized to 15bar, then behind the flow velocity flushing 1h with 100ml/min, be forced into again 45bar, activation;
2) after chromatographic column is ready to complete, taking by weighing Rehmannia Root crude extract 100g(stachyose content is 38.9%), be dissolved in the 300ml water, filter, high pressure prepares flow rate pump 10ml/min, sample introduction 10ml, take the volume ratio 69:31 of acetonitrile and water as elutriant, carry out the constant speed wash-out, (30 ℃ of internal temperatures under the differential detector, 35 ℃ of outside temperatures) detect whole elution process, observe chromatographic peak by software, rise at 15.3min stachyose product peak, collect by automatic fraction collector, collection time is that the stachyose peak began ascent stage 15.38 minutes, and the peak whole peak height 1/5th that descends finishes to collect.Finish this elution system behind the 40min, carrying out the repetition sample introduction collects, until the Rehmannia Root of preparation slightly to extract sample feeding complete, collect liquid and in Rotary Evaporators, reclaim solvent, to relative density 1.12(60 ℃ survey), (vacuum tightness is 0.09~0.15Mpa) under 25~30 ℃ to use vacuum-drying, dry 20~40h obtains dried powder 44.2g, by the high performance liquid chromatography quantitative analysis, stachyose content is 98.3%, and yield is 87.2%.
To sum up, the method of high performance preparative liquid chromatography Separation of Water threose provided by the present invention, under differential detector on-line monitoring, carry out the accurate collection of separated product and impurity, the sepn process simple and fast, flash liberation just can achieve the goal, without any need for chemical treatment method, guaranteed that effectively stachyose can not lose, the sepn process time spent is short, and fractional dose is large, the yield of stachyose can reach more than 85%, and particularly purity can reach more than 98%.Present method running cost is low, and filler for a long time recirculation uses, and solvent is recyclable to be reused, and disengaging time is short, and fractional dose is large, is fit to suitability for industrialized production.