219results about How to "Improve extraction quality" patented technology

The present invention relates to a method for preparing chitin and chitosan oligosac charide. The method comprises the steps that usual raw materials such as the crust of shrimp and crab, the insect crust or the fungal mycelia, etc. are micronized through the dry process or wet process; the carapace material of the obtained fine powder raw material is decalcified with the chemical process, and then is defatted and deproteinized with the method of micro-organism compound enzyme coarse enzyme liquid co-enzymolysis, and the insect and fungus fine powder thereof is directly defatted and deproteinized; a whole cell immobilizing bioreactor of a chitin deacetylase high-yield producing strain is prepared, to perform the circulatory deacetylation to the chitin and then obtain chitosan with corresponding degree of deacetylatoion; obligate anaerobic acid-producing bacterium and high-yield producing chitosan bacterium are utilized, the chitosan is submerged and fermented in the liquid, to obtain chitosan oligosaccharide with high water solubility. The present invention has the advantages that the method is helpful to fully utilize the resources, and makes the waste to the worth, at the same time, the default of the manufacturing process of the chemical process can be avoided, the production efficiency is improved, the energy is saved, the consumption is reduced, the byproduct with corresponding high value added can be produced, the comprehensive economic benefits of the relative secondary industry are obviously improved, the industrial development is promoted, and the multi-win effect is attained.

The invention discloses a region of interest extraction method of a pixel level. The method is used to reduce a data scale and improve image processing efficiency. The method comprises the following steps: using visual attention models to obtain a saliency map and carrying out saliency map binarization; after a salient point is obtained, clustering, and optimizing a problem generated during the clustering; simultaneously, carrying out original image binarization and extracting a binary image outline of the original image through scanning the binary image; taking the optimized clustering point as a seed point to perform filling; performing mask with the original image and then extracting the region of interest of the image. In the invention, the saliency map is taken as a base; the pixel point which is the salient point in the saliency map is taken as a target. An operation speed of extracting the region of interest in the image can form a linear relation with a number of the salient point. A leakage point rate of the region of interest at least decreased to a half of the original leakage point rate and a classification error rate does not increase obviously.

The invention relates to a sleep apnea syndrome detection method based on pulse and blood oxygen signals. The method includes: digging characteristic parameters related to SAS (statistical analysis system) from the pulse and blood oxygen signals by means of probability principal component analysis, setting up an SAS detection characteristic matrix, adopting a pouch decision tree for mapping the relation between the characteristic matrix and SAS disease degrees, and setting up an SAS detection model. By means of probability principal component analysis, input data dimensionality is decreased while quality of the characteristic matrix is improved; owing to the pouch decision tree, SAS detection accuracy is improved; by utilization of the sleep apnea syndrome detection method based on the pulse and blood oxygen signals, the SAS disease degrees of testees can be outputted only by inputting the pulse and blood oxygen signals of the testees.

The invention provides a flue gas recirculation-based wide load-wide coal deep denitrification system for a CFB (circulating fluidized bed) boiler. The system comprises the boiler, an SNCR (selective non-catalytic reduction) system, a primary air blower, a secondary air blower, an induced draft fan, a recirculation flue, a primary air recirculation adjusting valve, a secondary air recirculation adjusting valve and the like. One end of the recirculation flue is connected with an outlet of the induced draft fan, the other end is connected with an inlet of the primary air blower and an inlet of the secondary air blower by the aid of the primary air recirculation adjusting valve and the secondary air recirculation adjusting valve, low-temperature flue gas is led out of the outlet of the induced draft fan, the low-temperature flue gas with the proper flow is sent to different positions of a combustion chamber by the blowers through control by the adjusting valves, distribution of temperature fields in the boiler is optimized by fine controlling content of oxygen of primary air and content of oxygen of secondary air on the basis of SNCR, pollutant emission is reduced, and the CFB boiler can realize low emission of NOx under wide load-wide coal conditions.

The invention relates to an extraction method of mangrove plant DNA, comprising the following steps: (1) taking a leaf to grind, adding preheated 2% of CTAB extract to dissolve, and then adding 2 % of PVP by volume; (2) after water bath, adding a small quantity of RNase for heat preservation, then adding chloroform-isoamylol mixed liquor, and carrying out high-speed centrifugation at normal temperature; (3) putting supernate into a centrifuge tube, adding the preheated 2% of CTAB extract, adding chloroform-isoamylol mixed liquor, and mixing and carrying out high-speed centrifugation at normal temperature; (4) taking supernate and then putting into the centrifuge tube, adding NaCl solution and cold isopropanol, mixing, and putting and precipitating DNA at low temperature; (5) carrying out high-speed centrifugation at low temperature, abandoning the supernate, recovering the precipitate, washing by ethanol, air-drying, adding TE buffer solution, and storing at low temperature. The invention can effectively remove polysaccharide and tannin produced in the DNA extraction process, and the obtained mangrove plant has high DNA content and high purity.

The present invention relates to a method for preparing chitin and chitosan oligosac charide. The method comprises the steps that usual raw materials such as the crust of shrimp and crab, the insect crust or the fungal mycelia, etc. are micronized through the dry process or wet process; the carapace material of the obtained fine powder raw material is decalcified with the chemical process, and then is defatted and deproteinized with the method of micro-organism compound enzyme coarse enzyme liquid co-enzymolysis, and the insect and fungus fine powder thereof is directly defatted and deproteinized; a whole cell immobilizing bioreactor of a chitin deacetylase high-yield producing strain is prepared, to perform the circulatory deacetylation to the chitin and then obtain chitosan with corresponding degree of deacetylatoion; obligate anaerobic acid-producing bacterium and high-yield producing chitosan bacterium are utilized, the chitosan is submerged and fermented in the liquid, to obtain chitosan oligosaccharide with high water solubility. The present invention has the advantages that the method is helpful to fully utilize the resources, and makes the waste to the worth, at the same time, the default of the manufacturing process of the chemical process can be avoided, the production efficiency is improved, the energy is saved, the consumption is reduced, the byproduct with corresponding high value added can be produced, the comprehensive economic benefits of the relative secondary industry are obviously improved, the industrial development is promoted, and the multi-win effectis attained.

The invention relates to a clear and transparent sea cucumber polypeptide extraction process. The problem that nutrient loss in the transitional sea cucumber polypeptide processing process is large, color turbidity exists and the taste and nutrient substance absorption are affected is solved. The clear and transparent sea cucumber polypeptide extraction process comprises the following steps of preprocessing, smashing, pressurized heat treatment, enzymolysis, inactivation, centrifugation, primary decolorization, deflavoring, primary plate-frame pressure filtration, primary purification and concentration, ultrasonic extraction, secondary decolorization, secondary plate-frame pressure filtration, secondary purification and concentration, negative pressure concentration and spray drying.

The invention discloses an efficient Chinese medicine effective component extraction device which comprises an extraction kettle. A centrifugal barrel is arranged in the extraction kettle, the bottom end of the centrifugal barrel is fixedly connected with a rotating shaft, the top end of the extraction kettle is fixedly connected with a cylinder, a telescopic rod of the cylinder is fixedly connected with a cover plate matched with the centrifugal barrel, the bottom end of the cover plate is rotatably connected with a crushing rod, a crushing knife sleeves the crushing rod, the bottom end of the extraction kettle is fixedly connected with a transmission box, one side of the bottom end of the transmission box is fixedly connected with a motor, the bottom end of the rotating shaft sequentially penetrates the bottom wall of the extraction kettle and the transmission box and is in through connection with a residue discharge pipe, and a plurality of supporting legs are uniformly arranged at the bottom end of the extraction kettle. Medicine crushing and extraction are relatively independent by the aid of the centrifugal barrel, medicine extraction efficiency and extraction quality can be further improved by the aid of the crushing knife, medicine residues are independently discharged by the aid of the special hollow structural design of the rotating shaft, medicine residue discharge cannot be affected by liquid medicines, the extraction temperature of the liquid medicines can be effectively ensured by the aid of a cooling box, and the property of the medicines is ensured.

The invention discloses a composite feed additive product. The composition comprises the following components in percentage by weight: 10-15 percent of fructo-oligosaccharide, 10-20 percent of soybean polypeptide, 10-25 percent of fructus ligustri lucidi extract, 30-40 percent of bacillus subtilis freeze-dried powder and 20-35 percent of ganoderma lucidum solid fermentation culture, wherein the bacillus subtilis (Bacillus subtilis) is CGMCC 6012. According to a product provided by the invention, the amount of antibiotic medicaments used in animal breeding can be effectively reduced, the safety of animal meat products is improved, the feed utilization efficiency of animals is increased, the immunity of the animals is enhanced, and the breeding benefit is improved.

The invention provides a method for extracting DNA and RNA of a plant synchronously, which utilizes one plant sample; and after the plant sample is treated and decontaminated with the same steps, the DNA and RNA thereof are settled and purified respectively, thereby achieving the purpose of extracting synchronously. The method can be applied to the synchronous extraction of DNA and RNA of a yam sample and has the advantages of being able to synchronously conduct nucleic acid extraction, time-saving, economical and fast; besides, the ultracentrifugation, KAC and the like adopted by the method are very effective in eliminating the impurities contained in the yam such as amylose and the like; the DNA / RNA extraction quality of the method is high; the RNA OD260 / 280 ratio is between (1.8 to 2.0) and the DNA is between 1.7 to 1.8; and the electrophoretic band is complete and clear. The method is also applicable to the nucleic acid extraction of other plant samples.

The invention discloses an extraction method of navel orange peel essential oil. The extraction method comprises the following steps: (1) preparation of crude navel orange peel essential oil: crushing navel orange peels, mixing with water, carrying out enzymolysis by virtue of compound enzyme formed by pectinase and cellulase so as to obtain enzymolysis mixed liquid, carrying out enzyme deactivation on the enzymolysis mixed liquid, extracting essential oil by virtue of microwave-assisted supercritical CO2 fluid extracting instrument, injecting extracting liquid into a separator to separate CO2, and rectifying a separated product, so as to obtain the crude navel orange peel essential oil; and (2) terpene removal treatment of the crude navel orange peel essential oil: putting the crude navel orange peel essential oil obtained in the step (1) into a reaction kettle of a molecular distillation instrument, carrying out molecular distillation, and collecting a distillation residue, so as to obtain the navel orange peel essential oil. The extraction method of the navel orange peel essential oil has the advantages of rapidness, high efficiency, yield and essential oil content, stable quality and the like.

The invention discloses an extraction method for mangrove plant kandelia candel leaf total protein suitable for two-dimensional electrophoresis. A traditional trichloroacetic acid / acetone precipitation method for protein extraction and a traditional phenol extraction method for protein extraction are combined, a cosolvent SDS solution is introduced, the extraction process is optimized, and the Phe-B method suitable for extraction of the mangrove plant kandelia candel leaf total protein is established. The extraction efficiency and quality of the protein are effectively improved, and the technical scheme can be specifically suitable for extraction of the kandelia candel leaf protein in two-dimensional electrophoresis. The method has the advantages of being easy to operate, high in protein extraction efficiency and fewer in interfering substance, and is suitable for materials with difficult protein extraction, low protein extraction efficiency and more interfering substances. The extracted kandelia candel leaf protein completely meets the requirements of the first direction and the second direction of two-dimensional electrophoresis, a high-quality two-dimensional electrophoresis gel map with high resolution, more clear protein points, uniform distribution and the clear background can be obtained, and experiment repeatability and stability are good.

The invention relates to an SSR (Simple Sequence Repeat) core primer group and a method thereof for identifying a tea variety, and belongs to the technical field of biology. The method is characterized by comprising the following steps: (1) material selection; (2) genome DNA extraction; (3) PCR (Polymerase Chain Reaction) amplification of a target product; (4) electrophoretic separation of a PCR product; (5) silver staining development; (6) data analysis; and (7) result judgment. The SSR core primer group and the method thereof for identifying the tea variety, which are disclosed by the invention, have the characteristics of easiness and convenience for operation, accuracy in result, high repeatability, high identification capacity, low cost and the like and are suitable for identifying the tea variety.

Disclosed in the invention is a priori-knowledge-based reconstruction method of a closed skeleton contour in a medical fault image. Pretreatment is carried out on skeleton contours extracted from a medical fault image, and a single-loop skeleton contour with no redundant branch lines and intersection situation is used as a reference template and others are used as non-reference templates; with introduction of a same-type skeleton template concept, a contour matching the reference template best is searched from the same-type skeleton template by using a characteristic value method and affine transformation is established, and same-type skeleton templates matching the non-reference templates are found out at the same direction by using the neighboring relation between the non-reference templates and the reference template; and then the reference template and the same-type skeleton templates are used as priori knowledge to complete broken edges of the non-reference templates and removing uncorrelated contour lines. According to the invention, frequently occurring problems of intersection, neighbouring, and edge breaking and the like during contour extraction are classified and discussed, thereby substantially improving the quality and efficiency of contour extraction and generating a significance in improvement of precision of three-dimensional reconstruction.

The invention discloses a navel orange peel essential oil extracting method, which comprises the following steps: (1) crude navel orange peel essential oil preparation: smashing navel orange peel, putting into an extraction kettle of a microwave-ultrasonic wave synergistic extractor, adding an extracting solvent to perform microwave-ultrasonic wave synergistic extraction, filtering extract liquor and rectifying filtrate to obtain crude navel orange peel essential oil; (2) terpene removing treatment of the crude navel orange peel essential oil: putting the crude navel orange peel essential oil obtained in the step (1) into a reaction kettle of molecular distillation apparatus, performing molecular distillation and collecting distillation residues to obtain navel orange peel essential oil. The navel orange peel essential oil extracting method has the advantages of quickness, high efficiency, high yield, high essential oil content, stable quality and the like.

The invention discloses a social media hot topic extraction method and system. The hot topic extraction method comprises the following steps: filtering and concluding collected Internet text information data, then gathering Internet data information of the same topic by adopting a text clustering algorithm, clustering the Internet data information, and generating a text abstract for the selected topic. The hot topic extraction system comprises a data screening calculation module, a topic clustering module and a topic abstract extraction module, wherein the data screening calculation module isused for filtering and concluding the collected Internet text information data; the topic clustering module adopts the text clustering algorithm to cluster the filtered Internet text information dataof the same topic; and the topic abstract extraction module is used for generating a text abstract from the corresponding clustered Internet text information data according to a topic selected by a user so as to complete hotspot extraction. The method and the system improve the extraction quality of the social media hot topics and have relatively high practical value.

The invention discloses a method for increasing the yield of a color value of capsanthin. The method comprises the following steps of: extracting hot pepper particles, concentrating, obtaining capsanthin crude extract after removing a residual solvent, and obtaining the capsanthin by removing the pungency of the capsanthin crude extract; and extracting the hot pepper particles by adopting an extracting solvent to which a natural antioxidant is added in the extraction process. According to the method, the antioxidant is added to the extracting solvent so that on the one hand, the antioxidant consumes dissolved oxygen in the solvent so as to reduce the impact of the dissolved oxygen on the capsanthin, and on the other hand, the antioxidant can be fully in contact with the hot pepper particles in the extraction process so as to fully take effect, thereby the yield of the color value of the capsanthin can be effectively increased. The method is simple in technology and convenient to operate, has the obvious effect on the increasing of the yield of the color value of capsanthin and can realize the industrial production.

The invention discloses an efficient feed additive and belongs to the field of feed additives. The efficient feed additive is prepared from the following raw materials in parts by weight: 5 to 10 parts of achyranthan, 3 to 6 parts of perillae extracts, 2 to 5 parts of yeast cell wall extracts, 25 to 35 parts of bacillus subtilis cultures, 3 to 6 parts of astragalus extracts and 5 to 8 parts of pilose asiabell root extracts. The efficient feed additive is less in adding amount, stable in performance, safe to use and compatible with other feed additives. According to the efficient feed additive, the Chinese herbal medicine extracts and the microbial agents are reasonably proportioned and further matched with the bacillus subtilis cultures with high enzyme yield, so that the digestive absorption of the beneficial components of the Chinese herbal medicine in a feed is effectively promoted; meanwhile, the available value of the energy and the protein of each feed resource is improved. Thus, the breeding performance, stress performance and the comprehensive feeding benefit of livestock and poultry are enhanced; the daily gain and feed conversion ratio of the livestock and poultry are improved; the dosage of medicines is saved.

The invention discloses a traditional Chinese medicine blender of a wild chrysanthemum flower extract complex formulation honey. The traditional Chinese medicine blender comprises the following raw materials in parts by weight: 90-130 parts of a wild chrysanthemum flower extract, 50-80 parts of honey, 5-15 parts of radix codonopsis, 2-8 parts of wolfberry, 3-9 parts of Cornus officinalis, 1-5 parts of hawthorn, 2-6 parts of Chinese angelica, 2-4 parts of radix astragali, 3-5 parts of Poria cocos, 1-5 parts of licorice, 2-4 parts of bighead atractylodes rhizome, 3-5 parts of cassia twig, 2-4 parts of dried orange peel, 3-6 parts of rhizoma pinelliae preparata, 4-8 parts of white peony root, 2-4 parts of villous amomum fruit, 1-3 parts of acesulfame potassium, 2-4 parts of citric acid, 1-5 parts of butylated hydroxytoluene, 2-6 parts of sorbic acid, and 1-4 parts of xylitol. The invention also provides a preparation method of the traditional Chinese medicine blender. The obtained traditional Chinese medicine blender has the advantages of simple process, unique taste, abundant nutrition, and convenient eating.

The invention provides an automatic classification method and device for aviation safety reports, provides a kg2vec + CNN aviation safety report automatic classification scheme, uses a kg2vec model totrain word vectors of the aviation safety reports to serve as a feature matrix of aviation safety report text data, and inputs the feature matrix into a convolutional neural network. A new text feature vector is obtained after convolution kernel pooling, at the moment, the feature vector not only contains rich semantic features but also contains grammatical features, finally, the feature vector is input into a softmax classifier to be classified, a classification result is obtained, and therefore automatic classification for the aviation safety reports is achieved. Detailed experiments are carried out on a real aviation safety report data set, and experimental results show that kg2vec word vectors can effectively improve the classification accuracy of aviation safety reports; in all control experiments, the F1-score value of the kg2vec + CNN automatic classification scheme is the highest, and the classification accuracy is as high as 91.4%.

The invention relates to the technical field of geographic information service, in particular to multi-version open geographic information service access method based on fragment pattern matching, which comprises the steps of: inputting a source pattern file and a destination pattern file which are to be matched through a user interface; dynamically analyzing the pattern files by using a pattern analyzer; designing a pattern manager to manage the analyzed pattern files; designing a pattern matching assembly to match the pattern files; selecting an optimum matcher or matching combining method to match the pattern files; and carrying out fragment pattern matching. The invention improves the performance of the pattern matching, greatly improves the matching quality in comparison with the traditional method, and has higher matching quality and higher matching efficiency than that of the traditional pattern matching method, such as COMA and CUPID, which proves that the multi-version open geographic information service access method is more practical and reliable in network service pattern matching.

The invention relates to the field of extraction, in particular to a special fragmentation and extraction device for traditional Chinese medicines and a using method thereof. The special fragmentationand extraction device comprises a support, wherein an extraction barrel is fixed to the support; a vertical frame is fixed to the support; a liquid storage barrel fixed to the upper end of the vertical frame and used for storing extraction liquid; a fragmentation mechanism is arranged in the extraction barrel and used for grinding and smashing traditional Chinese medicines; the bottom of the fragmentation mechanism is connected with an extraction mechanism used for extracting the fragmented Chinese herbal medicines; the fragmentation mechanism is in transmission connection with the extractionmechanism; a pressure relief mechanism playing a pressure relief role is arranged between the bottom of the extraction mechanism and the inner wall of the extraction barrel; and the extraction mechanism drives the pressure relief mechanism to relieve pressure of the extraction mechanism through hydraulic pressure. According to the special fragmentation and extraction device for the traditional Chinese medicines and the using method thereof, the grinding efficiency and fragmentation effect of the Chinese herbal medicines are improved, efficient and high-quality extraction of the Chinese herbalmedicines is achieved, procedures and equipment structures are simplified, and the whole device is convenient to clean.

A system for storing a specification document to be checked on a storage device in a computer readable format. A computer implemented method which stores a graph structure of rules for performance of checking, and creates a rule application table of whether a rule is an application subject. For each node rule of the graph structure, average entropy of whether a specification satisfies the rules is derived by searching the graph structure of rules. While performing a depth-first searching of the graph structure of rules, a priority order index is derived from the rule application table for each node rule. Amendment candidates are then displayed according to value of the priority order index.

The invention provides efficient extraction equipment. The efficient extraction equipment comprises an extraction tower, a stirring device and a feeder; the extraction tower comprises a tower body, an upper sealing cover and a lower sealing cover, a liquid distribution board is arranged between the tower body and the upper sealing cover, multiple through holes are uniformly distributed in the liquid distribution board, a sight glass is connected to a discharge hole of the tower body through a pipeline, a first block valve is arranged between the sight glass and the discharge hole, and a second block valve is arranged on the portion, behind the sight glass, of the pipeline; the stirring device is vertically arranged in the center inside the tower body; the feeder is connected with a feed inlet of the tower body through the pipeline. According to the efficient extraction equipment, materials and an extracting agent are mixed in advance, and by means of stirring of a stirring rod between the feed inlet of the tower body and the liquid distribution board and distribution of the liquid distribution board, the degree of mixing among the materials is increased; by means of the sight glass at the discharge hole of the tower body, the material discharge situation after extraction can be observed and controlled, and the production quality is improved.

The invention discloses a method and a device for extracting stratum echo signals and overcomes the defects of high error and low precision of extracting stratum echo signals by nuclear magnetic resonance in the prior art. The method includes acquiring an echo original signal of nuclear magnetic resonance; subjecting the echo original signal to orthogonal multiplication operation with a sine signal and a cosine signal which are identical in frequency, and acquiring orthogonal component and cophase component of the echo original signal; subjecting the orthogonal component to wavelet decomposition and wavelet reconstruction, and acquiring an orthogonal output signal; subjecting the cophase component to wavelet decomposition and wavelet reconstruction, and acquiring a cophase output signal; synthesizing the orthogonal output signal and the cophase output signal by means of the digital phase-sensitive wave detection technology, and acquiring an initial phase of the echo signal of nuclear magnetic resonance and an envelope signal amplitude. By the method and the device for extracting stratum echo signals, noise interference in the signals can be efficiently filtered.

The invention relates to a method for measuring coal tar trimixed naphthalene oil, comprising the following steps: (1) weighing the dehydrated coal tar whose quality is X; (2) putting the coal tar into a distillation bottle of a fractionation device, and The fractionation device is connected and assembled; (3) start heating the retort in step (2), cut off the distillate segment with a temperature of 180-250°C and weigh the weight X1 of the distillate and measure the purity Z; (4) continue to reheat the retort The coal tar in the heating is heated until crystallization occurs in the distillate, and the heating is stopped, the temperature at this time is recorded, and the weight X2 of the distillate in the receiver at this time is weighed; (5) according to step (3) and step (4 ) fraction weight calculation of the content Y1 of naphthalene in coal tar and the content Y2 of three mixed naphthalene oils. The method for measuring coal tar trimixed naphthalene oil predicts the yield of trimixed naphthalene oil in actual production, can reduce the content of anthracene oil in the trimixed naphthalene oil, and improves the purity of the trimixed naphthalene oil, which can be used to guide practice Production.

The invention provides a method and an apparatus for extracting a keyword from a single document. According to an embodiment, the apparatus for extracting the keyword from the single document comprises a key sentence extraction unit for extracting a key sentence from the single document, and a keyword extraction unit for extracting the keyword from the key sentence.

The invention relates to a riboflavin-containing solid preparation. The riboflavin-containing solid preparation comprises, by weight, 23.0-65.0% of riboflavin, 18.0-65.0% of a diluent, 0.25-7.5% of a disintegrating agent, 0.1-5.5% of a binder and 0.5-2.0% of a lubricant. The riboflavin comprises spherical crystals with sizes of 25-35 micrometers and has purity greater than 98%. The riboflavin has the advantages of high purity, good processing performances and good fluidity. The solid preparation has a fast disintegrating rate and good stability.

The present invention relates to the field of extraction, and discloses an extraction system, which comprises a conveying line, a feeding line, an extraction device, a residue discharging device, a washing device and a control device, wherein the control device is respectively connected to the conveying line, the feeding line, the extraction device, the residue discharging device and the washing device. The extraction system of the present invention achieves the automated extraction of the material so as to improve the material extraction efficiency and the material extraction quality, and accurately collect the production data.

The invention discloses a method for extracting cephalotaxine from cephalotaxus hainanensis, after an extraction solvent is added, cephalotaxus hainanensis powder is extracted by an ultrasonic extraction device to obtain a first extracting solution, and a sulfuric acid aqueous solution or a methanol solution is used as the extraction solvent, so that economy and environmental friendliness can be realized, and industrial production can be realized; the first extracting solution is centrifuged, then supernate is poured out, the operations of adding the extracting solvent, carrying out ultrasonic extraction, centrifuging and pouring out the supernate after centrifuging are repeatedly executed for 1-4 times, the supernate is combined to obtain a second extracting solution, and the second extracting solution is successfully separated and purified to obtain a cephalotaxine monomer by adopting a method for separating and purifying cephalotaxine through preparative high performance liquid chromatography. The extraction quality of the cephalotaxine can be improved through multiple extraction, the efficiency is high, and the technical problems that in the prior art, the cephalotaxine is extracted from cephalotaxus plants through organic solvents such as ethyl alcohol, the cost is high, industrial production is not facilitated, column chromatography is mostly adopted during separation and purification, the solvent dosage is large, and the efficiency is low are solved.