CN101407801B - Preparation of earthworm fibrinolytic enzyme from Pheretima guillelmi Michaelsen and lyophilized powder preparation for injection prepared thereby - Google Patents

Preparation of earthworm fibrinolytic enzyme from Pheretima guillelmi Michaelsen and lyophilized powder preparation for injection prepared thereby Download PDF

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CN101407801B
CN101407801B CN200810182567XA CN200810182567A CN101407801B CN 101407801 B CN101407801 B CN 101407801B CN 200810182567X A CN200810182567X A CN 200810182567XA CN 200810182567 A CN200810182567 A CN 200810182567A CN 101407801 B CN101407801 B CN 101407801B
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earthworm
earthworm fibrinolysin
fibrinolysin
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陈运聪
王旺新
余冬林
郭秀华
商志国
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Tiande Yongkun Pharmaceutical Co.,Ltd.
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Abstract

The invention discloses a preparation method of an earthworm fibrinolytic enzyme from a Metaphire William and an intravenous freeze-dried powder injection prepared by the earthworm fibrinolytic enzyme. In the invention, the separation and purification of the earthworm fibrinolytic enzyme are realized through the chromatography of a carboxymethyl-agarose gel C1-6B column and a gel column, thereby obtaining the earthworm fibrinolytic enzyme from the Metaphire William and with higher purity; the molecular weight of the earthworm fibrinolytic enzyme obtained by the method is 28,000 to 30,000 Dalton and the specific activity of the earthworm fibrinolytic enzyme achieves 100,000 units/mg. Simultaneously the invention takes the earthworm fibrinolytic enzyme as a material for preparing the intravenous freeze-dried powder injection used for curing thrombotic diseases.

Description

Earthworm fibrinolysin preparation method and freeze-dried powder thereof from William chamber ring earthworm
Technical field
The present invention relates to the biological chemistry pharmaceutical technology, specifically, relate to a kind of preparation method and used for intravenous injection freeze-dried powder prepared therefrom that encircles the earthworm fibrinolysin of earthworm from the William chamber.
Background technology
Thrombotic diseases such as cerebral thrombosis, myocardial infarction, coronary heart disease etc. are the principal diseases of serious harm human health and life, its treatment usually needs to use thrombolytic drug to treat, at present, the antithrombotic reagent of Ying Yonging has urokinase, streptokinase, sense of organization plasminogen activator etc. clinically, but in the use, hemorrhage side effect often appears, though the thrombus of new formation there is restraining effect, very poor to outmoded thrombus effect.And, the medicine material source difficulty that has, complicated process of preparation costs an arm and a leg.In recent years, people more and more pay close attention to from earthworm and to extract earthworm fibrinolysin and be used for the treatment of thrombotic diseases.
Earthworm is called earthworm on the Chinese medicine, its property is salty, cold, it is fanatical hot-tempered to cure mainly height, convulsion with spasms, headache due to pathogenic wind-heat, hot eyes, apoplexy and hemiplegia, pant larynx numbness, arthralgia, sores etc., modern study show that fresh earthworm body contains the multiple protein enzyme, and earthworm fibrinolysin be the class in the earthworm body, extracted can fibrinolytic enzyme, its molecular weight is 15000~60000 dalton, it is present in the digestive tube of earthworm.Earthworm fibrinolysin has dual-use function, except energy direct hydrolysis scleroproein, can also activate profibr(in)olysin and become plasminogen, thereby have the effect of indirect hydrolysis of fibrin.Earthworm fibrinolysin is not single a kind of enzyme, but has the general name of the multiple protein lytic enzyme of identical function.Report through document, it contains enzyme amount difference different earthworm kinds, fibrinolytic is also different, and in present disclosed document and the patent, mostly earthworm fibrinolysin is from Eisenia foetida (Eisenia Foetida Sarigny), Lumbricidae Bimostos (Bimastos), Amythas dancatala and ginseng hair earthworm etc. separate extraction, do not see about extract the report of the active earthworm plasmin of certain molecular weight from William chamber ring earthworm (Metaphire guillelmi).
Summary of the invention
Technical problem to be solved by this invention provides a kind of preparation method who encircles the earthworm fibrinolysin of earthworm from the William chamber.
It is feedstock production low toxicity, used for intravenous injection freeze-dried powder efficiently with described earthworm fibrinolysin that the technical problem that the present invention further will solve provides a kind of.
For solving the problems of the technologies described above, technical scheme provided by the present invention is: the preparation method of described earthworm fibrinolysin comprises the steps:
(1) the earthworm fibrinolysin crude product extracts: get fresh earthworm and wash, under 4 ℃ ± 1 ℃ low temperature, 0.01~0.1mol/L the damping fluid that contains 0.1mol/L NaCl that adds pH6~8 of 1-5 times of weight part of earthworm, smash homogenate to pieces, extracting 2~5 hours, 4000~6000 rev/mins then, centrifugal 10~30 minutes, get supernatant liquor, add ammonium sulfate to 60%~80% saturation ratio, spend the night in 4 ℃ ± 1 ℃ placement, 4000~6000 rev/mins, centrifugal 10~30 minutes, taking precipitate, the dialysis desalination, lyophilize obtains the earthworm fibrinolysin crude product;
(2) purifying of earthworm fibrinolysin crude product: with 0.01~0.1mol/L damping fluid dissolving of the earthworm fibrinolysin crude product in the step (1) with pH6~8,4000~6000 rev/mins, centrifugal 10~30 minutes, getting supernatant liquor separates with carboxymethyl-sepharose Cl-6B post, with sodium-chlor straight line gradient mode wash-out, the concentration of this sodium chloride solution from the 0mol/L linear increment to 1mol/L, collect the elutriant of each elution peak, the dialysis desalination, lyophilize, detect through activity, obtain the earthworm fibrinolysin purified product;
(3) the earthworm fibrinolysin purified product is refining: with the 0.01~0.1mol/L damping fluid dissolving of the earthworm fibrinolysin purified product in the step (2) with pH6~8, separate with gel column, 0.01~0.1mol/L buffer solution elution with pH6~8, collect the elutriant of active elution peak, the dialysis desalination, lyophilize obtains the earthworm fibrinolysin highly finished product, its molecular weight is 28000~30000 dalton, and the ratio work of described earthworm fibrinolysin reaches every milligram of protein 10 ten thousand units.
Damping fluid described in the above-mentioned steps is tris-HCI buffer, phosphate buffered saline buffer or sodium chloride solution; Described dialysis desalination condition is 8000~10000 dalton for the dialysis tubing aperture, will collect the liquid dialysis tubing of packing into, puts into the distilled water of collecting 20~50 times of liquid and stirs dialysis, changes first water, dialyses 18~32 hours in 4~8 hours.
The separation of process described carboxymethyl-sepharose Cl-6B post in the step (2), under the wavelength of 280nm, collected elutriant is carried out UV spectrophotometer measuring, obtain wavelength 280nm and absorb collection of illustrative plates, obtain a plurality of albumen absorption peaks, with the elutriant of each absorption peak, the dialysis desalination, lyophilize, detect through activity, the III absorption peak has very high fibrinolytic, obtains the earthworm fibrinolysin purified product.
Gel column described in the step (3) is sephadex G-75 type or sephadex g-100 type.Further separation and purification through described gel column, under the wavelength of 280nm, collected elutriant is carried out UV spectrophotometer measuring, obtain wavelength 280nm and absorb collection of illustrative plates, it is an albumen absorption peak, with this sample dialysis desalination, lyophilize obtains the earthworm fibrinolysin highly finished product, it is 28000~30000 dalton that this sample is measured its molecular weight through the SDS-polyacrylamide gel electrophoresis, and the ratio work of described earthworm fibrinolysin reaches every milligram of protein 10 ten thousand units.
The present invention also provides a kind of lyophilized injectable powder of being made by the earthworm fibrinolysin and the acceptable accessories combination from William chamber ring earthworm of above-mentioned preparation method's preparation.Described auxiliary material comprises thinner, vehicle, weighting agent, tackiness agent, absorption enhancer, stablizer of pharmaceutical field routine etc.This lyophilized injectable powder can be used for treating thrombotic diseases.
Advantage of the present invention: the present invention has extracted molecular weight at 28000~30000 daltonian earthworm fibrinolysins from the ring earthworm of William chamber, and it is prepared into lyophilized injectable powder can be used for intravenous injection, directly act on the thromboembolism position, in treatment time, can change patient's illness rapidly, reduce mortality ratio.This stable preparation process, quality controllable.
In order further to set forth the result of treatment of earthworm fibrinolysin of the present invention, the earthworm fibrinolysin lyophilized injectable powder that adopts the embodiment of the invention 2 to make carries out following pharmacodynamic experiment, the present invention is further elaborated, but the present invention is not limited to the content that comprises in the following experiment.
Test example 1: the influence that the earthworm fibrinolysin freeze-dried powder forms rabbit arteriovenous shut thrombus in vivo
[test drug]
1. the earthworm fibrinolysin lyophilized injectable powder that adopts the embodiment of the invention 2 to make.It is standby to be diluted to desired concn with physiological saline before the experiment, and 0.25mg/ props up.
2. urokinase: 100,000 units/, white swan pharmaceutcal corporation, Ltd of Harbin high-tech group.
3. heparin sodium: 100u/mg.Changzhou bright biochemical research institute.
[experimental animal]
Rabbit, body weight 2-3kg, male and female dual-purpose.
[test method and result]
Get 48 of rabbit, be divided into 6 groups at random, with 20% urethane auricular vein injecting anesthetic, dosage is 5ml/kg, and back of the body position is fixing, cuts neck, separates right common carotid artery and left external jugular vein.After an end that is full of the polyethylene tube (divide three sections connections, put into surgical thread in the stage casing) of heparin-saline in advance inserted left external jugular vein, will manage the other end and insert right common carotid artery, open the open blood flow of hemostatic clamp.Control group after 15 minutes in Herba Clinopodii, get blood 2ml and measure euglobulin lysis time (ELT), fibrinogen content (FIB) and fibrin degradation product (FDP) (FDP), and take out silk thread rapidly and weigh, then claimed dry weight in 24 hours at 37 ℃ of freeze-day with constant temperature with thrombus.Then after 15 minutes, vein gives physiological saline, earthworm fibrinolysin freeze-dried powder (medicine to be measured), urokinase to other test group respectively, after dosage sees Table 1,3 hour, gets blood and thrombus as stated above, and claims wet, dry weight.
The influence that table 1 medicine to be measured forms the rabbit thrombus in vivo
Figure G200810182567XD00041
*With relatively relatively p<0.05 △ and the relatively p<0.01 T-check of physiological saline group of the large, medium and small dosage group of p<0.01 ☆ of control group
Table 2 fibrinogen content (FIB)
Figure G200810182567XD00042
*Compare p with the physiological saline group〉0.05 SNK check
Table 3 euglobulin lysis time (ELR)
Figure G200810182567XD00043
*With relatively p<0.01 rank test of physiological saline group
Table 4 fibrin degradation product (FDP) (FDP)
*With relatively p<0.01 rank test of physiological saline group
[conclusion]
Test-results shows, the earthworm fibrinolysin freeze-dried powder through little, in, heavy dose of group relatively has significant difference (p<0.01) with the physiological saline group, and the further effect of formation of thrombus that suppresses be described; And in, heavy dose of group is remarkable with the control group comparing difference.This medicine is described except that the thrombosis of inhibition is arranged, also has certain thrombolytic effect, between each dosage group dose-dependence is arranged.Blood FIB, ELT and FDP measurement show that the earthworm fibrinolysin freeze-dried powder is not obvious to the influence of FIB, but middle dosage and heavy dose can make ELT significantly shorten, and large, medium and small dosage can make FDP significantly increase, and show that it has the effect that activates fibrinolytic.
Test example 2 earthworm fibrinolysin freeze-dried powders influence laboratory report to rabbit platelet
[test drug]
1, the earthworm fibrinolysin lyophilized injectable powder that adopts the embodiment of the invention 2 to make.It is standby to be diluted to desired concn with physiological saline before the experiment, and 0.25mg/ props up.
2, MAILUONING ZHUSHEYE: Jinling Pharmaceutical Co., Ltd., Jinling Pharmaceutical Factory.
3, sodium chloride injection: the Harbin No.6 Pharmaceutical Factory provides.
4, ADP (adenosine diphosphate (ADP)): U.S. biopool company.
5, Sodium Citrate: Harbin City's chemical reagent factory.
[experimental animal]
White big ear rabbit, body weight 2.0~3.0kg, male and female dual-purpose.
[test method]
Select 40 of healthy rabbits, be divided into 5 groups at random, 8 every group, be respectively the large, medium and small dosage group of earthworm fibrinolysin freeze-dried powder (dosage is respectively 4mg/kg, 2mg/kg, 1mg/kg), blank group and positive control drug Mailuoning group.Get rabbit and weigh, auricular vein is injected earthworm fibrinolysin freeze-dried powder 4mg/kg respectively, 2mg/kg, and 1mg/kg, Mailuoning 1.1ml/kg, blank is organized not injectable drug.Behind the injectable drug 8min, use 5ml syringe heart extracting blood 2.7ml respectively, join in the test tube that is added with the 0.3ml3.8% Sodium Citrate in advance, shake up stand-by.
(1) mensuration of platelet count and platelet adhesion rate:
Get anticoagulation 750 μ l, the adding capacity is in the glass pin of 5ml, places on the platelet adhesion reaction instrument rotating disk, with 3 commentaries on classics/min speed rotation 15min.From anticoagulant tube and glass pin, get blood 20 μ l then respectively, respectively be added to and carry out platelet count in the test tube that fills 0.38ml thrombocyte diluent, calculate adhesion rate.
(2) mensuration of platelet aggregation rate:
With anticoagulation with the centrifugal 5min of 500 commentaries on classics/min, preparation platelet rich plasma (PRP), residue blood plasma is through the centrifugal 10min of 3000 commentaries on classics/min, preparation platelet poor plasma (PPP) is transferred platelet count to 4~5 * 1012/L among the PRP with PPP, gets PRP200 μ l, behind 37 ℃ of incubation 30min, add inductor ADP2 μ mol/L, assemble instrument by the turbidimetry for Determination platelet aggregation rate with blood, platelet aggregation rate is measured and is all finished in 3h.
[test-results]
Table 5 earthworm fibrinolysin freeze-dried powder is to hematoblastic influence
Figure G200810182567XD00061
Compare with the blank group, *P<0.05, *P<0.01 is compared with the Mailuoning group, #P<0.01
[conclusion]
The earthworm fibrinolysin freeze-dried powder does not have influence to number of platelets, but heavy dose of earthworm fibrinolysin freeze-dried powder (4mg/kg) obviously suppresses platelet adhesion reaction, aggregation capability, and its antiplatelet adhesive attraction is better than Mailuoning.
Product toxic side effect of the present invention is little, harmless to body, described product earthworm fibrinolysin freeze-dried powder is in the dog long term toxicity test, establish four groups altogether, every group of 6 domestic hybrid dogs, intravenous injection every day physiological saline 20ml, the earthworm fibrinolysin freeze-dried powder is respectively 150ug/kg, 750ug/kg, 3750ug/kg.12 weeks of successive administration, its result shows, intravenous injection earthworm fibrinolysin freeze-dried powder is little, in, big three dosage groups and blank group relatively, similar substantially in weight increase, acropetal coefficient, hematological indices, blood parameters, blood coagulation, no difference of science of statistics.The tissue abnormalities phenomenon is not found in the histopathology report yet, and cardiac diagnosis lead is checked also no abnormality seen simultaneously.Therefore prove this freeze-dried powder when dosage is 150ug/kg to 3750ug/kg, in 12 weeks of continuous use, no overt toxicity reaction after two all recovery stages observed, is not seen the delayed toxicity reaction yet.
The product of prepared of the present invention and scleroproein have special avidity, through highly purified, check through Physiology and biochemistry, only can guarantee under the situation that scleroproein exists, just to play thrombolytic effect, hemorrhage, the haemolysis that can not use urokinase etc. existing medicine produced, cause side effect such as cohesion.And test-results proves that product of the present invention does not have allergen, heat source response.The irritative response of epithelial lesion, subcutaneous connective tissue hyperemia, checking cellular infiltration is not seen by test exhausted animal tissues, can use safely.Specific embodiments:
In order to understand the present invention better, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention is not limited to the following examples.
Embodiment 1
(1) gets fresh earthworm 2400g, wash, under 4 ℃ ± 1 ℃ low temperature, the 0.01mol/L Tris-HCl damping fluid that contains 0.1mol/L NaCl that adds the pH6 of 1 times of weight part, homogenate, and extracting 2 hours, 4000 rev/mins then, centrifugal 10 minutes, get supernatant liquor, add ammonium sulfate to 60% saturation ratio again, spend the night, saltout in 4 ℃ ± 1 ℃ placement, 4000 rev/mins, centrifugal 10 minutes, get precipitation, the dialysis desalination, lyophilize obtains the earthworm fibrinolysin crude product;
(2) with of the 0.01mol/LTris-HCl damping fluid dissolving of this earthworm fibrinolysin crude product with pH6,4000 rev/mins, centrifugal 10 minutes, getting supernatant liquor separates with carboxymethyl-sepharose Cl-6B post, with sodium-chlor straight line gradient mode wash-out, the concentration of this sodium chloride solution from the 0mol/L linear increment to 1mol/L, under the wavelength of 280nm, collected elutriant is carried out UV spectrophotometer measuring, obtain wavelength 280nm and absorb collection of illustrative plates, collect each absorption peak, the dialysis desalination, lyophilize, detect through activity, the III absorption peak has very high fibrinolytic, promptly obtains the earthworm fibrinolysin purified product;
(3) this earthworm fibrinolysin purified product is dissolved in the 0.01mol/L Tris-HCl damping fluid of pH6, separate with sephadex G-75 type (SephadexG-75) gel column, 0.01mol/L Tris-HCl buffer solution elution with pH6, under the wavelength of 280nm, collected elutriant is carried out UV spectrophotometer measuring, obtain wavelength 280nm and absorb collection of illustrative plates, it is an albumen absorption peak, with this sample dialysis desalination, lyophilize, obtain the earthworm fibrinolysin highly finished product, it is 28000~30000 dalton that this sample is measured its molecular weight through the SDS-polyacrylamide gel electrophoresis, and the ratio work of described earthworm fibrinolysin reaches every milligram of protein 10 ten thousand units.
The condition of dialysis desalination is 8000~10000 dalton for the dialysis tubing aperture among the above-mentioned preparation method, will collect the liquid dialysis tubing of packing into, puts into 20 times distilled water and stirs and dialyse, and changes first water, dialyses 18 hours in 4 hours.
Get the earthworm fibrinolysin 250mg that makes, add low-molecular-weight dextran aseptic aqueous solution 1000ml, Sterile Filtration, 1000 of packing, every 1ml, lyophilized injectable powder is made in lyophilize.
Embodiment 2
(1) gets fresh earthworm 2400g, wash, under 4 ℃ ± 1 ℃ low temperature, the 0.1mol/L phosphate buffered saline buffer that contains 0.1mol/L NaCl that adds the pH8 of 3 times of weight parts, homogenate, and extracting 5 hours, 6000 rev/mins then, centrifugal 30 minutes, get supernatant liquor, add ammonium sulfate to 80% saturation ratio again, spend the night, saltout in 4 ℃ ± 1 ℃ placement, 6000 rev/mins, centrifugal 30 minutes, get precipitation, the dialysis desalination, lyophilize obtains the earthworm fibrinolysin crude product;
(2) with of the 0.1mol/LTris-HCl damping fluid dissolving of this earthworm fibrinolysin crude product with pH8,6000 rev/mins, centrifugal 30 minutes, getting supernatant liquor separates with carboxymethyl-sepharose Cl-6B post, with sodium-chlor straight line gradient mode wash-out, the concentration of this sodium chloride solution from the 0mol/L linear increment to 1mol/L, under the wavelength of 280nm, collected elutriant is carried out UV spectrophotometer measuring, obtain wavelength 280nm and absorb collection of illustrative plates, collect each absorption peak, the dialysis desalination, lyophilize, detect through activity, the III absorption peak has very high fibrinolytic, promptly obtains the earthworm fibrinolysin purified product;
(3) this earthworm fibrinolysin purified product is dissolved in the 0.1mol/L phosphate buffered saline buffer of pH8, separate with sephadex g-100 type (SephadexG-100) gel column, 0.1mol/L phosphate buffered saline buffer wash-out with pH8, under the wavelength of 280nm, collected elutriant is carried out UV spectrophotometer measuring, obtain wavelength 280nm and absorb collection of illustrative plates, it is an albumen absorption peak, with this sample dialysis desalination, lyophilize, obtain the earthworm fibrinolysin highly finished product, it is 28000~30000 dalton that this sample is measured its molecular weight through the SDS-polyacrylamide gel electrophoresis, and the ratio work of described earthworm fibrinolysin reaches every milligram of protein 10 ten thousand units.
The condition of dialysis desalination is 8000~10000 dalton for the dialysis tubing aperture among the above-mentioned preparation method, will collect the liquid dialysis tubing of packing into, puts into 50 times distilled water and stirs and dialyse, and changes first water, dialyses 32 hours in 8 hours.
Get the earthworm fibrinolysin 250mg that makes, add starch, lactose etc. and be mixed with aseptic aqueous solution 1000ml, Sterile Filtration, 1000 of packing, every 1ml, lyophilized injectable powder is made in lyophilize.
Embodiment 3
(1) gets fresh earthworm 2400g, wash, under 4 ℃ ± 1 ℃ low temperature, the 0.05mol/L sodium-chlor damping fluid that contains 0.1mol/L NaCl that adds the pH7.8 of 5 times of weight parts, homogenate, and extracting 5 hours, 5000 rev/mins then, centrifugal 20 minutes, get supernatant liquor, add ammonium sulfate to 70% saturation ratio again, spend the night, saltout in 4 ℃ ± 1 ℃ placement, 4000 rev/mins, centrifugal 10 minutes, get precipitation, the dialysis desalination, lyophilize obtains the earthworm fibrinolysin crude product;
(2) with of the 0.05mol/LTris-HCl damping fluid dissolving of this earthworm fibrinolysin crude product with pH7.8,5000 rev/mins, centrifugal 20 minutes, getting supernatant liquor separates with carboxymethyl-sepharose Cl-6B post, with sodium-chlor straight line gradient mode wash-out, the concentration of this sodium chloride solution from the 0mol/L linear increment to 1mol/L, under the wavelength of 280nm, collected elutriant is carried out UV spectrophotometer measuring, obtain wavelength 280nm and absorb collection of illustrative plates, collect each absorption peak, the dialysis desalination, lyophilize, detect through activity, the III absorption peak has very high fibrinolytic, promptly obtains the earthworm fibrinolysin purified product;
(3) this earthworm fibrinolysin purified product is dissolved in the 0.05mol/L sodium-chlor damping fluid of pH7.8, separate with sephadex g-100 type (SephadexG-100) gel column, 0.05mol/L sodium-chlor buffer solution elution with pH7.8, under the wavelength of 280nm, collected elutriant is carried out UV spectrophotometer measuring, obtain wavelength 280nm and absorb collection of illustrative plates, it is an albumen absorption peak, with this sample dialysis desalination, lyophilize, obtain the earthworm fibrinolysin highly finished product, it is 28000~30000 dalton that this sample is measured its molecular weight through the SDS-polyacrylamide gel electrophoresis, and the ratio work of described earthworm fibrinolysin reaches every milligram of protein 10 ten thousand units.
The condition of dialysis desalination is 8000~10000 dalton for the dialysis tubing aperture among the above-mentioned preparation method, will collect the liquid dialysis tubing of packing into, puts into 30 times distilled water and stirs and dialyse, and changes first water, dialyses 24 hours in 6 hours.
Get the earthworm fibrinolysin 250mg that makes, add sodium-chlor aseptic aqueous solution 1000ml, Sterile Filtration, 1000 of packing, every 1ml, lyophilized injectable powder is made in lyophilize.

Claims (2)

1. encircle the preparation method of the earthworm fibrinolysin of earthworm from the William chamber, it is characterized in that, may further comprise the steps:
(1) the earthworm fibrinolysin crude product extracts: get fresh earthworm and wash, under 4 ℃ ± 1 ℃ low temperature, 0.01~0.1mol/L the damping fluid that contains 0.1mol/LNaCl that adds pH6~8 of 1-5 times of weight part of earthworm, smash homogenate to pieces, extracting 2~5 hours, 4000~6000 rev/mins then, centrifugal 10~30 minutes, get supernatant liquor, add ammonium sulfate to 60%~80% saturation ratio, spend the night 4000~6000 rev/mins in 4 ℃ ± 1 ℃ placement, centrifugal 10~30 minutes, taking precipitate, dialysis desalination, lyophilize, obtain the earthworm fibrinolysin crude product, wherein said damping fluid is tris-HCI buffer or phosphate buffered saline buffer;
(2) purifying of earthworm fibrinolysin crude product: with 0.01~0.1mol/L damping fluid dissolving of the earthworm fibrinolysin crude product in the step (1) with pH6~8,4000~6000 rev/mins, centrifugal 10~30 minutes, getting supernatant liquor separates with carboxymethyl-sepharose C1-6B post, with sodium-chlor straight line gradient mode wash-out, the concentration of this sodium chloride solution from the 0mol/L linear increment to 1mol/L, collect the elutriant of each elution peak, the dialysis desalination, lyophilize, detect through activity, obtain the earthworm fibrinolysin purified product, wherein said damping fluid is tris-HCI buffer or phosphate buffered saline buffer;
(3) the earthworm fibrinolysin purified product is refining: with the 0.01~0.1mol/L damping fluid dissolving of the earthworm fibrinolysin purified product in the step (2) with pH6~8, separate with gel column, 0.01~0.1mol/L buffer solution elution with pH6~8, collect the elutriant of active elution peak, the dialysis desalination, lyophilize, obtain the earthworm fibrinolysin highly finished product, its molecular weight is 28000~30000 dalton, the ratio work of described earthworm fibrinolysin reaches every milligram of protein 10 ten thousand units, and wherein said damping fluid is tris-HCI buffer or phosphate buffered saline buffer.
2. the preparation method of the earthworm fibrinolysin from William chamber ring earthworm according to claim 1, it is characterized in that: the gel column described in the step (3) is sephadex G-75 type or sephadex g-100 type.
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