66 results about "Bone targeting" patented technology

The invention provides a compound with a structure as shown in a formula (I). The compound can be used as a polyphenol organic ligand to be self-assembled with metal ions to form metal polyphenol nanoparticles. The nano-particles have a bone targeting effect, are safe, effective, stable and uniform, can realize whole-body transfer, can be degraded in a bone pathology microenvironment, have regulation and control effects on bone resorption and bone formation, can cooperatively regulate and control bone balance, and have a great application prospect in the field of bone diseases such as osteoporosis. # imgabs0 #

The invention discloses an oligonucleotide intracellular nano delivery system based on polypeptide modification and application thereof. The system is composed of a periostin targeting sequence (SDSSD), a matrix metalloproteinase 2 (MMP2) response sequence (GPAGLLG), a cell penetrating sequence (RRRRRRRR, R9), a reactive oxygen species (ROS) scavenging and adhesion enhancing group (Gly-DOPA)) and a terminal dibenzocyclooctyne (DBCO) modified engineered polypeptide SDSSD-PEG5-YGFGG-GPAGLLG-R9-(G-DOPA) 3-K4-C-DBCO, and a target oligonucleotide miRNA-26a-A5-Azido modified by 5-polyadenylic acid (AAAAA) and an azide group (Azido), and the target oligonucleotide miRNA-26a-A5-Azido, the target oligonucleotide and assembling through a click chemical reaction and a non-covalent interaction. The nano system has good bone targeting, enzyme responsiveness, intracellular delivery effect and biological safety, can realize stable and efficient delivery of therapeutic oligonucleotides in vivo, and significantly improves the utilization efficiency and therapeutic potential of oligonucleotides. The oligonucleotide intracellular nano delivery system has a wide application prospect in the fields of clinical transformation and precise treatment of oligonucleotide drugs.

The invention relates to the technical field of biomedical materials, in particular to an alendronate-modified ZIF-8 encapsulated TPP-carbon dot bone targeting nano-material and a preparation method and application thereof.The alendronate-modified ZIF-8 serves as a carrier, TPP-modified carbon dots are encapsulated in the carrier, citric acid, urea and cerium salt serve as raw materials of the TPP-modified carbon dots, and the alendronate-modified ZIF-8 encapsulated TPP-carbon dot bone targeting nano-material is prepared through a one-step method. After cerium-doped carbon quantum dots are synthesized through a hydrothermal method, TPP is grafted through an amide method, alendronate endows the material with a bone targeting function, and TPP modified carbon dots endow the material with antioxidant and mitochondrial targeting functions. According to the invention, the bone targeting property is excellent, and bone focuses are efficiently enriched; the anti-oxidation and anti-inflammatory capacities are high, and the infected microenvironment can be improved; zIF-8 packaging is stable, and functional components can be controllably released; multiple components cooperate to promote bone repair, accumulation of non-target organs is little, and the composition is safe, reliable and suitable for treatment of various bone-related diseases.

Among other things, the present disclosure provides antibodies and antigen-binding fragments thereof, conjugates, compositions, and methods thereof that can be used for various purposes, including treating conditions, disorders, or diseases including cancer, e.g., prostate cancer. In some embodiments, antibodies and antigen-binding fragments thereof comprise one or more bone-targeting moieties, e.g., one or more bone-targeting peptides. In some embodiments, antibodies and antigen-binding fragments thereof, conjugates, compositions, and methods thereof can be used to treat bone metastases.

The invention relates to the field of nutritional health food, and discloses a casein modified active peptide for promoting bone repair and a preparation method thereof.The structure of the active peptide sequentially comprises a bone targeting sequence with high affinity to hydroxyapatite, a casein phosphopeptide core sequence capable of chelating calcium ions, a casein phosphopeptide core sequence capable of chelating calcium ions, a casein phosphopeptide core sequence capable of chelating calcium ions, a casein phosphopeptide core sequence capable of chelating calcium ions and a casein phosphopeptide core sequence capable of chelating calcium ions from the C-terminal to the N-terminal. The digestion sequence can be specifically hydrolyzed by matrix metalloproteinase, and the alkynyl functional group is used for covalent cross-linking. The active peptide can be mixed with an azido-containing multi-arm cross-linking agent, and hydrogel can be rapidly formed under physiological conditions through cycloaddition reaction. The system can be gelated in situ and anchored to a bone defect part in a targeted manner, and is triggered by a specific enzyme in a pathological microenvironment to controllably release active peptide fragments capable of chelating calcium ions, so that the concentration of local mineral ions is adjusted, the cell living environment is improved, and an effective new way is provided for promoting bone repair.

The invention discloses myricetin-loaded bone-targeted magnetic composite nanoparticles and a preparation method thereof. The preparation method comprises the following steps: step 1, preparing nanoparticles taking ferroferric oxide as an inner core; step 2, preparing magnetic mesoporous silica nanoparticles with ferroferric oxide as an inner core according to the nanoparticles prepared in the step 1; step 3, performing amination modification treatment on the surfaces of the magnetic mesoporous silica nanoparticles prepared in the step 2 to obtain magnetic mesoporous silica modified nanoparticles; step 4, preparing a ketal thiol-polyethylene glycol-aspartic acid hexapeptide molecule; and step 5, loading myricetin on the magnetic mesoporous silica modified nanoparticles prepared in the step 3, and blocking myricetin by using the ketal thiol-polyethylene glycol-aspartic acid hexapeptide molecules prepared in the step 4 after loading. The invention further discloses application of the compound in image tracing in osteolysis and treatment drugs.

The invention relates to the technical field of preparation of bone cement, and particularly discloses a preparation method of a photo-thermal response type gold nanorod-bone cement composite material. The method comprises the following steps: synthesizing a gold seed solution; constructing a growth solution; controlling the growth of the nanorod; gradient centrifugal purification; carrying out surface ligand exchange (sulfydryl-PEG); preparing a bone cement composite material; curing and forming; gold nanorods (GNRs) are uniformly embedded into a polymethyl methacrylate (PMMA) bone cement matrix, so that the problems that free nanorods are easy to migrate and poor in bone targeting are solved. The local temperature can be accurately controlled, and damage to surrounding tissues is avoided. According to the invention, immunogen cell death (ICD) can be effectively induced, and anti-tumor immune response can be activated. According to the invention, enough mechanical support can be provided, and the stability after implantation is ensured.

The application belongs to the technical field of bioactive nanomaterials, and particularly relates to a metformin nanomaterial, a preparation method and application thereof. The average hydrodynamic diameter of the nanomaterial is less than 500 nm, and the nanomaterial is prepared by a preparation method comprising the following steps: self-assembly of metformin and polyphenols to obtain metformin-polyphenol nanoparticles; reaction of bisphosphonate and polyethylene glycol to obtain bisphosphonate-polyethylene glycol organic segments; and reaction of the metformin-polyphenol nanoparticles and the bisphosphonate-polyethylene glycol organic segments to obtain the nanomaterial. The metformin, polyphenol, polyethylene glycol and bisphosphonate are prepared into the metformin-loaded nanomaterial through specific reactions, the systemic delivery of metformin is realized, the efficacy and bioavailability of metformin on osteoporosis are improved, and the bone targeting of metformin is also improved.

The present application relates to the field of high polymer material and medical engineering, and particularly relates to a high polymer nanoparticle with bone targeting, neutralizing acidic environment and antioxidant properties and a preparation method thereof. The preparation raw material of the high polymer nanoparticle comprises a zoledronic acid modified polycaprolactone-polypeptide copolymer, and a chemical structural formula of the copolymer is shown as follows: The high polymer nanoparticle prepared by using the zoledronic acid modified polycaprolactone-polypeptide copolymer as the raw material has the bone targeting, excellent antioxidant property and the ability of neutralizing acidic environment. The high polymer nanoparticle can exert the significant therapeutic effect (antioxidant, neutralizing acidic environment) of osteoporosis only by relying on the inherent activity of the material itself, so that a series of toxicity problems possibly caused by traditional drugs are fundamentally and greatly reduced, and a new scheme is provided for the treatment of osteoporosis.

The invention provides a bone targeting nano composite carrier, a bone targeting nano composite drug and a preparation method and application of the bone targeting nano composite carrier and the bone targeting nano composite drug, and belongs to the technical field of biological medicine, the bone targeting nano composite carrier comprises epigallocatechin gallate and E7 targeting peptide, and the mass ratio of the epigallocatechin gallate to the E7 targeting peptide is 1: (1.5-2.5); the epigallocatechin gallate and the E7 targeting peptide are connected through a condensation reaction. According to the invention, the bone-targeted nano composite carrier is used for entrapping an osteogenic induction component, and a bone-targeted nano composite drug is obtained through self-assembly. According to the invention, triple functions of osteogenesis promoting drugs, anti-inflammatory / anti-oxidation components and active targeting are integrated, and the bone-targeting nano composite drug not only can directly stimulate bone formation, but also can fundamentally improve the crucial pathological microenvironment in diabetic osteoporosis.

The invention relates to the technical field of nano-micelles, in particular to rifapentine-loaded bone targeting nano-micelles as well as a preparation method and application thereof.The rifapentine-loaded bone targeting nano-micelles are prepared by accurately controlling a synthesis process (shading, catalyst ratio, temperature and feed ratio) of a bone targeting nano-micelle carrier (ALN-PLGA-mPEG) modified by alendronate sodium (ALN). The bone targeting ability of alendronate sodium (ALN) is combined with the drug loading and long circulation advantages of polymer mPEG-PLGA micelles to construct a bone targeting nano-micelle carrier (ALN-PLGA-mPEG), so that the obtained rifapentine-loaded bone targeting nano-micelle (ALN-PLGA-mPEG (at) RPT) can significantly improve the bone targeting and slow release performance, and provides a new strategy with high efficiency and low toxicity for precise treatment of bone tuberculosis.

The invention discloses a bone targeting forsythiaside A loaded exosome and a preparation method and application thereof, and relates to the technical field of biomedicine.The preparation method comprises the following steps that bone marrow mesenchymal stem cells are separated and cultured, and GLG1 is over-expressed through a molecular cloning technology to obtain GLG1-BMSCs; the exosome GLG1-Exos of the GLG1-BMSCs is collected through an ultracentrifugation method; and loading forsythiaside A into the exosome through an ultrasonic method and an extrusion method to obtain the GLG1-Exos-FTA. The traditional Chinese medicine active ingredient forsythiaside A is loaded, and forsythiaside A is delivered to bone marrow in a targeted manner, so that the effect of preventing and improving diabetic osteoporosis is achieved; due to the targeting effect, the bioavailability of forsythiaside A can be enhanced, and meanwhile, the curative effect of resisting diabetic osteoporosis is improved. Experiments show that the loading rate of forsythiaside A of the GLG1-Exos-FTA reaches 36.9%, the particle size distribution peak value is 122.4 nm, and the GLG1-Exos-FTA has typical exosome characteristics and bone targeting, and can significantly improve the bone microstructure of diabetic osteoporosis mice.

The invention discloses a bone targeting exosome polypeptide delivery system based on a biological orthogonal strategy and a preparation method and application thereof, and relates to the technical field of biological medicine and drug delivery. The bone targeting exosome polypeptide delivery system based on the biological orthogonal strategy comprises an engineered exosome as a carrier and an osteogenesis-promoting therapeutic polypeptide, wherein the osteogenesis-promoting therapeutic polypeptide is anchored on the membrane surface of the engineered exosome; a fusion protein is displayed on the membrane surface of the engineered exosome, and the fusion protein is formed by fusing a bone targeting ligand and an industrial exosome transmembrane scaffold protein; the osteogenesis-promoting therapeutic polypeptide is connected with the industrial exosome through the flexible spacer arm, and the membrane surface steric hindrance is reduced through the flexible spacer arm so as to improve the accessibility of the active fragment of the polypeptide; the delivery system provided by the invention can improve the targeted enrichment and treatment efficiency of osteogenesis promoting drugs in bone tissues, and is suitable for intervention of bone metabolism related diseases such as osteoporosis, delayed fracture healing, bone defects and the like.

The invention belongs to the technical field of biological medicine, and relates to a bone targeted drug liposome as well as a preparation method and application thereof, the bone targeted drug liposome is prepared from the following raw materials: phospholipid, cholesterol, PEG (polyethylene glycol), a targeted group and a drug; the phospholipid and the cholesterol form a lipid core layer, the PEG of which the tail end is coupled with the targeting group is connected to the surface of the lipid core layer, and the drug is encapsulated in the lipid core layer. The delivery efficiency of the drug is remarkably improved through modification of the targeting group, the solubility and stability of the drug can be improved through the liposome, the slow release effect is achieved, and the drug effect persistence is improved.

The invention provides a near-infrared light NIR response-based dual-regulation nano drug delivery system and application thereof, the nano drug delivery system takes mesoporous silica as a carrier, and alendronate sodium is coupled on the surface of the carrier to increase bone targeting; mesopores in the carrier are blocked by rhodamine RH, nitric oxide NO can be consumed to generate rhodamine B, and bioactive drugs in the carrier are released. The invention constructs a systemic drug carrier with bone targeting and diabetic bone microenvironment response release, and solves the problems that the bone healing ability of diabetic patients is significantly reduced, and traditional local treatment is difficult to effectively improve systemic bone microenvironment disorder; the problems that an existing local drug system cannot be released according to needs, local NO and NO in bone marrow are difficult to efficiently remove, and macrophages are difficult to transform to repair-promoting M2 type are solved.

The invention belongs to the technical field of bioactive nano materials, and particularly relates to a metformin nano material as well as a preparation method and application thereof. The average hydrodynamic diameter of the nano material is less than 500 nm, and the nano material is prepared by the preparation method comprising the following steps: self-assembling metformin and a polyphenol compound to obtain metformin-polyphenol nano particles; the preparation method comprises the following steps: reacting bisphosphonate with polyethylene glycol to obtain a bisphosphonate-polyethylene glycol organic chain segment; the metformin-polyphenol nano particles and the diphosphonate-polyethylene glycol organic chain segment are subjected to a reaction, and the nano material is obtained. According to the invention, the metformin, the polyphenol, the polyethylene glycol and the bisphosphonate are subjected to a specific reaction to prepare the metformin-loaded nano material, so that the whole-body delivery of the metformin can be realized, the curative effect and bioavailability of the metformin on osteoporosis are improved, and meanwhile, the bone targeting property of the metformin is improved.

The invention discloses a naringin carbon quantum dot-based bone-targeting nanocomposite as well as a preparation method and application thereof. The preparation method comprises the following steps: 1, preparing naringin-derived carbon quantum dots (N-CQDs); 2, preparing hybrid silicon dioxide / hydroxyapatite nano particles MH; (3) preparing amino functionalized MH nano particles MH-NH2; 4, adding the activated N-CQDs solution into the MH-NH2 solution, and carrying out stirring reaction at room temperature to prepare MH-CQDs; and 5, dispersing the NHS-PEG-Mal into the MH-CQDs solution, slowly stirring, and dialyzing after the reaction is completed, so as to obtain the P-coated MH-CQDs. According to the nano-composite disclosed by the invention, a natural drug naringin with osteogenic activity is creatively converted into N-CQDs with a pharmacological function and a fluorescent tracing capability, and the N-CQDs are combined with a bionic silicon dioxide-hydroxyapatite substrate, so that the essential fusion of a'drug-probe 'function is realized.

The invention discloses a preparation method and an application of a bone targeting catechin-strontium metal polyphenol nano particle. The system takes a metal-polyphenol network (MPN) formed by coordination self-assembly of strontium ions and catechin as a core, and tetracycline is modified on the surface of the MPN to construct a bone targeting functional layer. The MPN structure can significantly enhance the loading efficiency and physiological stability of catechin, and the tetracycline modification on the surface endows the nanoparticles with excellent bone targeting ability. When reaching an osteoporosis focus, the nanoparticles can respond to a local weakly acidic microenvironment and controllably release catechin, and exert antioxidant and anti-inflammatory effects, thereby reversing a pathological microenvironment unfavorable for bone regeneration. Meanwhile, the MPN skeleton is gradually degraded in vivo, and the released Sr < 2 + > can promote proliferation and differentiation of pre-osteogenic cells, inhibit the activity of osteoclasts and promote formation of new bones. The system integrates bone targeting, microenvironment response drug release, immunoregulation and ion regulation treatment, and provides a new strategy for precise treatment of osteoporosis.

The application discloses a bone-targeting protein conjugated chelating agent and a preparation method and application thereof, and belongs to the technical field of biological medicines.The bone-targeting protein conjugated chelating agent is constructed through gene engineering and chemical conjugation technology, the chelating agent is covalently connected by a bone-targeting fusion protein and a small molecule chelating agent, the bone-targeting fusion protein part is composed of a bone-targeting peptide, a cell-penetrating peptide and a Halo tag protein, and the protein molecule can efficiently pass through the cell membrane to reach the bone tissue; the small molecule chelating agent is isothiocyanobenzyl DTPA, and can efficiently undergo nucleophilic addition reaction with lysine residues of the bone-targeting fusion protein under weak alkaline conditions to generate the bone-targeting protein conjugated chelating agent.The chelating agent has the targeting ability to the bone tissue, can be complexed with heavy metal ions deposited in the bone, and realizes precise chelation of the heavy metal ions deposited in the bone.

The invention discloses a fresh rehmannia root exosome as well as preparation and application thereof. The fresh rehmannia root exosome comprises lipid vesicles filled with rehmannia root metabolites, the rehmannia root metabolites comprise phenylpropanoid and polyketone compounds, and the preparation method comprises the following steps: centrifuging fresh rehmannia root juice and taking supernate; carrying out ultracentrifugation on the supernate, taking precipitate, and resuspending the precipitate by adopting a buffer solution to obtain a first solution; adding the first solution to a concentrated solution of sucrose, and taking liquid at the interface of the concentrated solution of sucrose after ultracentrifugation to obtain a second solution; adding a buffer solution into the second solution, and taking the precipitate after ultracentrifugation to obtain the fresh rehmannia root exosome. Only the exosome extracted from the fresh rehmannia root is used as an active pharmaceutical ingredient and is matched with the modified bone targeting peptide, so that a good osteoporosis treatment effect is achieved, the problems of low active ingredient concentration, large medicinal ingredient extraction loss and poor medicinal effect of single use in the fresh rehmannia root are effectively solved, toxic and side effects of the medicine are avoided, and the curative effect is good. Good patent medicine prospects are realized.

This invention belongs to the field of biomedical materials technology and discloses a highly efficient antibacterial zinc oxide nanoparticle with bone targeting capability. The nanoparticle comprises zinc oxide nanoparticles with active sites and a bone-targeting material grafted onto the surface of the zinc oxide nanoparticles via the active sites. The active site is an amino group; the bone-targeting material is one of aspartic oligopeptide and glutamic acid oligopeptide. This invention also discloses the preparation method and application of the aforementioned highly efficient antibacterial zinc oxide nanoparticle with bone targeting capability. The highly efficient antibacterial zinc oxide nanoparticle with bone targeting capability provided by this invention can be directed to the site of bone infection through the targeting ability of the bone-targeting material for hydroxyapatite in bone tissue, and then exert the broad-spectrum antibacterial ability of the zinc oxide nanoparticles to kill bacteria.

The invention discloses a bone targeting protein coupling chelating agent as well as a preparation method and application thereof. Belongs to the technical field of biological medicine. The bone targeting protein coupling chelating agent is constructed through genetic engineering and chemical coupling technologies, the chelating agent is formed by covalent linkage of bone targeting fusion protein and a small molecule chelating agent, the bone targeting fusion protein part is composed of bone targeting peptide, cell-penetrating peptide and Halo tag protein, and the small molecule chelating agent part is composed of bone targeting peptide, cell-penetrating peptide and Halo tag protein. It is ensured that protein molecules can efficiently penetrate through cell membranes to reach bone tissues; the small molecule chelating agent is benzyl isothiocyanate DTPA, and can be subjected to efficient nucleophilic addition reaction with lysine residues of bone targeting fusion protein under a weak base condition to generate the bone targeting protein coupling chelating agent. The chelating agent not only has the targeting ability to bone tissues, but also can be complexed with the bone deposited heavy metal ions, so that the precise excretion promotion of the bone deposited heavy metal ions is realized.

Disclosed herein are compounds and methods for treating Osteogenesis Imperfecta in an individual. In some embodiments, the compounds include a bone anabolic agent, a linker, and a bone targeting ligand. In some embodiments, the methods include reducing the incidences of or likelihood of bone fracture, increasing bone density or strength of a bone, and providing compounds to low density and weakened bone sites in an individual with Osteogenesis Imperfecta.

The present application discloses a bone-targeting radiopharmaceutical or imaging agent and a use thereof. The bone-targeting radiopharmaceutical or imaging agent can be used for the treatment or diagnosis of bone diseases, such as bone metastasis from a tumor.

This application provides a bone-targeting biomimetic biomineral nanocomposite material, its preparation method, and its application, relating to the field of medical materials. The method includes the following steps: S1: Providing water-soluble phosphate and water-soluble calcium salt; S2: Mixing the aqueous solutions of the water-soluble phosphate and water-soluble calcium salt, followed by magnetic stirring and centrifugation to obtain calcium phosphate; S3: Washing the calcium phosphate and freeze-drying for storage; S4: Providing GLG1+ NIH-3T3 cells and expanding them; S5: Extracting the cell membrane from the GLG1+ cells and resuspending the cell membrane in pre-cooled PBS buffer to obtain a cell membrane solution, which is stored at -80°C for later use; S6: Mixing the calcium phosphate from S1 with the GLG1+ cell membrane solution and sonicating to obtain cell membrane-coated calcium phosphate nanoparticles; S7: Centrifuging the calcium phosphate nanoparticles to remove excess cell membrane, resuspending them in ultrapure water and washing at least twice to finally obtain the bone-targeting biomimetic biomineral nanocomposite material, which is then stored at 4°C.

The application discloses a preparation method and application of a nano-enzyme composite hydrogel system with synergistic effects of anti-inflammatory, antioxidant and pro-osteogenesis. The material is based on an injectable hydrogel composed of methacrylated chitosan and thiolated sodium alginate, loaded with cerium nano-enzymes, and coated with carbon dots of baicalin and alendronate sodium in it through coordination. In a high oxidative stress microenvironment, the thioether bond in the hydrogel responds to reactive oxygen species and releases nanoparticles. Cerium nano-enzymes remove excess reactive oxygen species through their superoxide dismutase and catalase activities and continuously produce oxygen, synergize with the antioxidant and anti-inflammatory effects of baicalin in the carbon dots and the bone targeting effect of alendronate sodium, jointly regulate macrophage polarization to reshape the immune microenvironment, and promote osteogenic differentiation and angiogenesis. Therefore, the application provides a systematic treatment platform with the functions of active oxygen response release and multi-target regulation for the repair of diabetic alveolar bone defects, which is coupled with pathological microenvironment remodeling and bone regeneration.

The present application relates to a kind of bone-targeted trimeric protein and its preparation method and application, belong to biomedical technology field.The present application provides a kind of recombinant trimeric protein based on trimeric motif, including nuclear factor κB receptor activation factor extracellular segment, it is verified with in-vivo and in-vitro experiment with high bone targeting, possess inhibiting osteoclastogenesis and promoting osteoblast differentiation Dual control activity, it can also induce CD4 + Treg cell development, improve the bone marrow inflammatory microenvironment of osteoporosis model mice, can be used as the drug of osteoporosis, solves the problem that traditional single-function treatment drug in prior art will cause bone resorption rebound and bone loss after stopping drug, and further induces inflammation, provides new ideas and means for the research and treatment of osteoporosis, has good application prospect.

The invention discloses a bone-targeted functionalized tetrahedral framework nucleic acid nano system as well as a preparation method and application thereof, the bone-targeted functionalized tetrahedral framework nucleic acid nano system comprises tetrahedral framework nucleic acid tFNA-Sa, polypeptide SDSSD with bone cell specific targeting and an osteoporosis treatment drug, the bone targeting tetrahedral framework nucleic acid tFNA-Sa is used for modifying bone targeting polypeptide to obtain the bone targeting tetrahedral framework nucleic acid tFNAs-SDSSD, the editability and the biocompatibility of the nucleic acid tetrahedron are utilized, the SDSSD bone targeting peptide is modified on the surface of the tetrahedron, the bone targeting ability can be given to the bone targeting peptide, and then the purposes of efficient aggregation of the medicine in bone tissue, high-efficiency drug delivery and the like are achieved. The distribution of the medicine in non-target tissues is reduced. The targeted delivery system not only can improve the treatment effect of the medicine, but also can greatly reduce the side effect of the medicine, and brings a new scheme for targeted therapy for postmenopausal osteoporosis.

The invention discloses a responsive nano-enzyme for delivering KGN and a preparation method and application thereof, and the preparation method comprises the following steps: suspending zinc chloride and cerium nitrate in an N, N-dimethylformamide solution, and suspending meso-tetra (4-carboxyphenyl) porphin in the N, N-dimethylformamide solution; adding a proper amount of glacial acetic acid; the preparation method comprises the following steps: dissolving tannic acid in an N, N-dimethylformamide solution, and dissolving meso-tetra (4-carboxyl phenyl) porphin in the N, N-dimethylformamide solution to obtain meso-tetra (4-carboxyl phenyl) porphin-Zn < 2 + >-Ce < 3 + >; the preparation method comprises the following steps: adding modified mercaptoacetic acid-meso-tetra (4-carboxyl phenyl) porphin-Zn < 2 + >-Ce < 3 + > and cysteine modified CAP bone targeting peptide into triethylamine, and reacting to obtain meso-tetra (4-carboxyl phenyl) porphin-Zn < 2 + >-Ce < 3 + >-tannic acid-coated CAP peptide with targeting property; the preparation method comprises the following steps: dissolving KGN in dimethyl sulfoxide, diluting, and adding into an N, N-dimethylformamide solution of SH-TCPP-Zn < 2 + >-Ce < 3 + > (at) TA to obtain the sulfydryl-tetra (4-carboxylphenyl) porphin-Zn < 2 + >-Ce < 3 + > (at) tannic acid (at) KGN(at) CAP peptide. The invention relates to a biodegradable nano particle with a cartilage targeting function.

The present invention belongs to the technical field of drug carriers, and discloses a preparation method and application of a flaxseed cyclic peptide bone-targeted nano-delivery system. The present invention prepares nano-sized spherical calcium carbonate particles by an emulsion method, and then selects calcium carbonate particles as nano-carriers of the delivery system, and utilizes its unique porous structure and large specific surface area to load flaxseed cyclic peptide, showing a high drug loading rate. At the same time, the bone-targeted substance selected for the delivery system is asparagine peptide, which has good biocompatibility. The flaxseed cyclic peptide bone-targeted nano-delivery system obtained by the present invention can greatly reduce the biosafety issues such as obvious side effects and systemic toxicity caused by traditional drugs; and has shown significant therapeutic effects on osteoporosis in animal experiments, greatly reversing bone problems such as trabecular loss caused by osteoporosis, and maintaining bone homeostasis.