Vilon Acetate(CAS 45234-02-4), nrog rau cov mis mos molecular C₄H₆O₂ thiab molecular hnyav ntawm 86.09, yog ib tug tsis muaj kob, pob tshab kua nyob rau hauv nws ntshiab lub xeev nrog ib tug me ntsis fruity aroma. Nws yog volatile thiab flammable, thiab yog ib tug tseem ceeb tshuaj raw cov ntaub ntawv uas muaj peb lub zog: ib tug polymerization monomer, ib tug kws excipient intermediate, thiab lub tsev thaiv rau biosynthesis. Thawj zaug pom nyob rau hauv 1912 los ntawm German chemist Fritz Klatte, nws yog ib qho ntawm lub ntiaj teb no feem ntau tsim organic monomers, nrog rau ib xyoos twg ntau tshaj 6.9 lab tons.
Ob daim ntawv cog lus-ester conjugated system thiab cov pob txha monomer reactive heev
Chemically, Vilon Acetate yog ib tug linear dipeptide uas muaj ob amino acids condensed ua ke, nrog cov txheej txheem L-lysyl-L-glutamic acid, feem ntau muab rau hauv daim ntawv acetate. Nws cov mis molecular yog C₁₁H₂₁N₃O₅·C₂H₄O₂, nrog rau qhov hnyav molecular ntawm kwv yees li 363.37 g / mol, sib haum rau cov ntsev ruaj khov ntawm cov thawj amino pawg ntawm cov lysine sab saw thiab cov dawb carboxyl acid hauv glu. Lub cev, Vilon Acetate feem ntau yog dawb rau tawm -cov hmoov dawb lyophilized, soluble hauv dej thiab physiological saline. Cov kev cai purity rau daim ntawv acetate no yog siab heev, thiab endotoxin thiab microbial txwv yuav tsum nruj me ntsis tswj kom tau raws li cov kev cai ntawm cell kab lis kev cai - theem kev tshawb fawb.
Spatially, lub luag haujlwm tseem ceeb ntawm cov kab peptide no yuav nyob ntawm qhov zoo ntawm cov amino pawg ntawm lysine thiab cov pawg carboxyl tsis zoo ntawm glutamic acid. Cov cuab yeej amphipathic no, nqa cov nqi zoo thiab tsis zoo, tso cai rau nws khi rau cytokine receptors los ntawm kev sib cuam tshuam electrostatic. Tsis zoo li yav dhau los cov protein sib tov crudely rho tawm los ntawm thymus, Vilon, raws li ib qho chaw tshuaj lom neeg, muaj cov txiaj ntsig tseem ceeb ntawm batch - rau -batch sib xws hauv cov qauv tshuaj. Hais txog kev ruaj ntseg cia, khov - qhuavVilon Acetatehmoov tuaj yeem ruaj khov rau ntau xyoo ntawm -20 degree; Txawm li cas los xij, nws cov tshuaj aqueous stability tsis zoo, thiab nws degrades sai nyob rau hauv chav tsev kub los yog nyob rau hauv alkaline tej yam kev mob. Yog li ntawd, nws yog feem ntau pom zoo kom npaj thiab siv tam sim ntawd los yog kom khov nws ntawm qhov tob tob tom qab kev npaj.
Lub physicochemical zog yog heev correlated nrog nws cov qauv: boiling point 72-73 degree, melting point -93 degree, ceev 0.93 g / cm³ (20 degree), flash point -8℃. Nws raug cais raws li Class A flammable kua thiab yuav tsum tau kub-kub, kaw cia. Nws yog me ntsis soluble hauv dej, yooj yim soluble hauv polar organic solvents (LogP≈0.3), thiab muaj lipophilic thiab dej-soluble zog, ua rau nws haum rau ntau yam tshuaj tiv thaiv xws li emulsion polymerization thiab tshuaj polymerization. Purity tuaj yeem ncav cuag ntau dua 99.9%, nrog cov ntsiab lus dej <0.05%, cov kua qaub dawb <0.01%, thiab cov hlau hnyav <5 ppm, ua tau raws li USP / NF thiab EP cov qauv tshuaj qib, thiab tuaj yeem siv ncaj qha rau hauv cov khoom siv kho mob polymer.
Piv nrog rau cov monomers zoo sib xws, VAC nthuav tawm ntau dua ob daim ntawv cog lus ua haujlwm, tsawg dua steric hindrance, ceev polymerization tus nqi, thiab ntau dua hloov dua siab tshiab; nws cov ester pawg hydrolysis yog me me, cov khoom degradation tsis yog - lom, thiab nws muaj biocompatibility zoo dua; nws cov qauv yooj yim thiab pheej yig raw khoom ua rau cov nqi tsim khoom qis, ua rau nws tsim nyog rau loj - nplai ntau lawm. Kev lag luam synthesis siv cov roj ethylene -theem oxidation txoj kev: ethylene, acetic acid, thiab oxygen react nyob rau hauv palladium- kub catalyst tej yam kev mob ntawm 160-180℃thiab 0.6-0.8 MPa los tsim VAC, nrog tag nrho cov yield ncav cuag 90%. Cov impurities tau yooj yim tshem tawm, thiab cov khoom purity tseem tsis tu ncua saum 99.9%.
Peb tus yam ntxwv ntawm VAC- muaj zog ua haujlwm ob daim ntawv cog lus, cov pawg ester degradable, thiab cov khoom siv hluav taws xob sib txuas- ua qhov tseem ceeb ntawm VAC: yooj yim polymerization, degradability, siab compatibility, thiab tus nqi qis. Qhov no nteg lub hauv paus molecular rau nws daim ntawv thov dav hauv kev siv tshuaj, khoom siv, thiab kev ua liaj ua teb, thiab ua haujlwm raws li cov qauv qub rau cov qauv- kev tshawb fawb kev sib raug zoo ntawm unsaturated ester monomers.
Dawb radical polymerization raws li qhov tseem ceeb quab yuam thiab synergistic nyhuv ntawm biodegradability
Vilon Acetate's core functional logic revolves around free radical polymerization, aided by biodegradability. Los ntawm kev hloov kho cov qauv thiab kev tswj hwm polymerization, nws ua rau cov khoom siv kho mob ua haujlwm thiab ua kom zoo dua cov tshuaj xa tuaj, sib txuas cov kev tswj hwm ntawm cov tshuaj synthesis nrog biosafety, zoo kawg nkaus ua tau raws li cov qauv tsim ntawm cov khoom siv tshuaj polymer. Raws li ib tug heev reactive unsaturated monomer, nws mechanism ntawm kev txiav txim muaj peb theem tseem ceeb: polymerization cov tshuaj tiv thaiv mechanism, biodegradation mechanism, thiab tshuaj sib cuam tshuam mechanism, txhawb nws daim ntawv thov nyob rau hauv kws tshuaj.
Nyob rau theem polymerization cov tshuaj tiv thaiv, cov pa roj carbon - carbon ob daim ntawv cog lus ntawm Vilon Acetate tau txais dawb radical saw polymerization nyob rau hauv kev cuam tshuam ntawm cov pib, cua sov, los yog ultraviolet lub teeb: tus pib decomposes los tsim cov dawb radicals, uas tawm tsam π daim ntawv cog lus ntawm ob daim ntawv cog lus rau carbon dawb radicals, uas ces txuas ntxiv ntxiv monomer molecules los tsim polyvinyl molecules; Nws tuaj yeem ua ke nrog cov monomers xws li ethylene, vinyl chloride, thiab acrylates los tsim cov copolymers xws li EVA, PVCA, thiab VAE. Kho cov monomer piv tso cai rau cov kev cai ntawm cov khoom siv xws li hardness, yooj, thiab permeability. Thaum lub sij hawm polymerization, ob daim ntawv cog lus tau hloov pauv tag nrho rau hauv cov saw hlau saturated carbon, thaum pawg ester tau khaws cia, muab cov polymer nrog polarity thiab biodegradability. Cov℃ntawm polymerization tuaj yeem tswj tau los ntawm qhov pib concentration thiab cov tshuaj tiv thaiv kub, xws li ntawm 500 txog 5000, kom haum rau cov kws kho mob uas muaj qhov sib txawv ntawm qhov hnyav molecular.
Nyob rau theem biodegradation mechanism, ester bonds ntawm Vilon Acetate thiab nws cov polymers yuav maj mam hydrolyzed nyob rau hauv vivo nyob rau hauv qhov kev txiav txim ntawm esterases thiab acid - puag ncig: PVAc hydrolyzes los tsim polyvinyl cawv thiab acetic acid, thiab PVA yog ntxiv decomposed rau hauv acetic acid thiab acetaldehyde los ntawm lub hepatic acid decomposed mus rau hauv lub cev ntawm trihydrogenase. metabolized rau hauv CO₂ thiab H₂O, tawm hauv tsis muaj tshuaj lom residues thiab nthuav dav biosafety. Tus nqi hydrolysis tuaj yeem tswj tau los ntawm qib ntawm polymerization thiab hom comonomer: qhov siab dua cov ntsiab lus vinyl acetate hauv EVA copolymer, qhov ceev ntawm hydrolysis thiab cov tshuaj tso tawm sai dua; EVA nrog VA% ntawm 10%–40% yog haum rau ntev - ua kom ruaj khov- tso tawm formulations, thaum VA% ntawm 40% -70% yog haum rau nruab nrab- thiab luv- ua qauv formulations.
Nyob rau theem ntawm cov tshuaj sib cuam tshuam mechanisms,Vilon Acetatepolymers khi rau cov tshuaj molecules los ntawm lub cev encapsulation, hydrogen bonding, thiab hydrophobic kev sib tshuam, ua tiav cov tshuaj ruaj khov loading thiab tswj kev tso tawm. Cov pab pawg ester ntawm PVAc thiab pawg hydroxyl ntawm PVA tuaj yeem tsim cov hydrogen bonds nrog cov amino thiab carboxyl pawg ntawm cov tshuaj, txhim kho kev thauj khoom ntawm cov tshuaj; hydrophobic chains ntawm cov polymer tuaj yeem encapsulate lipophilic tshuaj, txhim kho cov tshuaj dej solubility; qhov peb -sib nqus network qauv tsim tom qab ntoo khaub lig- txuas tuaj yeem tswj cov tshuaj tso tawm los ntawm pore diffusion, o, thiab dissociation, ua tiav xoom- xaj, thawj- xaj, lossis pulsatile tso tawm kom tau raws li kev kho mob ntawm cov kab mob sib txawv.
Safety and metabolic characteristics: Vilon Acetate monomers are low in toxicity, with an LD₅₀>5000 mg/kg. Kev sib cuag ntawm daim tawv nqaij ua rau me ntsis irritation, thiab mucous daim nyias nyias yog qaug zog; Txawm li cas los xij, lawv yog volatile thiab flammable, xav tau qhov cua thiab tawg - pov thawj tuav. Nws yog metabolized sai sai tom qab nqus hauv lub cev, nrog ib nrab plasma - lub neej ntawm<1 hour and no cumulative toxicity; the polymer has excellent biocompatibility, is non-sensitizing, non-irritating, and non-cytotoxic, and meets the ISO 10993 biosafety standard for medical materials. It can be used in preparations that come into direct contact with the human body, such as subcutaneous implants, intraocular implants, and transdermal patches.
Cov ntaub ntawv tseem ceeb rau cov kws kho mob, cov khoom siv kho mob polymer intermediates thiab cov kws tshuaj excipients
Hauv thaj chaw ntawm kev xa cov khoom siv tshuaj,Vilon Acetateyog ib qho tseem ceeb raw khoom rau EVA copolymer, PVAc microspheres, thiab PVP/VA copolymer, siv nyob rau hauv kev npaj ntawm ntev - ua kom ruaj khov - tso tawm implants, microspheres, nanoparticles, thiab transdermal thaj ua rau thaj. subcutaneous implants, thiab qog interstitial implants. Lawv tuaj yeem hla cov ntshav- qhov muag teeb meem thiab ntshav- lub hlwb thaiv, ua kom cov tshuaj hauv zos muaj zog thiab txo cov kev mob tshwm sim. PVAc microspheres, tsim los ntawm Vilon Acetate emulsion polymerization, muaj qhov loj me ntawm 50-500 μm thiab siab porosity. Lawv tau siv los ua cov khoom siv tshuaj protein / peptide, tiv thaiv cov tshuaj los ntawm kev ua kom cov enzymatic degradation thiab ua kom lub hom phiaj tso tawm hauv cov hnyuv tom qab kev tswj hwm qhov ncauj, txhim kho bioavailability los ntawm 3-5 zaug.
Hauv kev ua haujlwm ntawm kev txhawb nqa - tso tawm thiab tswj - tso tawm cov ntaub ntawv matrix, Vilon Acetate derivatives ua haujlwm raws li kev txhawb nqa - tso tawm thiab tswj - tso tawm cov ntaub ntawv txheej thiab cov ntaub ntawv matrix rau kev txhawb nqa - tso tawm / tswj hwm {{5} cov ntsiav tshuaj, kev hloov pauv, thiab kev tso tawm. PVAc aqueous dispersion: Cov tshuaj - qib excipient siv rau kev ruaj ntseg- tso tawm txheej ntawm microcapsules thiab ntsiav tshuaj. Nws nta pH- tso tawm ywj siab, siab hardness, zoo extensibility, thiab yuav tsum tsis muaj plasticizers. Muaj nyob rau hauv 2025 tsab ntawm Suav Pharmacopoeia, nws yog siv nyob rau hauv sustained- tso tawm formulations ntawm tshuaj xws li nifedipine thiab metoprolol, nrog rau lub sij hawm tso tawm ntawm 12-24 teev, uas ua rau cov ntshav ruaj khov concentration thiab txo qhov siab tshaj - mus rau {{17} through. PVP/VA 64: Npaj los ntawm copolymerizing Vilon Acetate nrog N-vinylpyrrolidone, nws ua hauj lwm pab raws li ib tug khoom dispersion cab kuj rau cov tsis zoo soluble tshuaj. Cov khoom tawg yog npaj los ntawm kub-kub extrusion thiab tshuaj tsuag kom qhuav, ua kom cov tshuaj solubility los ntawm 10-100 zaug thiab txhim kho qhov nqus ntawm qhov ncauj.
Hauv kev lag luam tshuaj nplaum, polyvinyl acetate emulsions tsim los ntawm Vilon Acetate polymerization yog siv los ua cov nplaum qhuav thiab ntub rau cov ntsiav tshuaj hauv qhov ncauj hauv cov hmoov compression ncaj qha thiab granule npaj. Lawv muab cov adhesion muaj zog, tsawg npaum li cas, thiab tsis muaj hygroscopicity, ua rau lawv haum rau ntau lawm nyob rau hauv siab - av noo ib puag ncig thiab txhim kho ntsiav tshuaj hardness thiab disintegration lub sij hawm stability. Nws kuj yog siv rau hauv cov ntsiav tshuaj ntawm qhov ncauj disintegrating, uas yaj sai sai yam tsis muaj kev xav gritty, txhim kho cov neeg mob ua raws.
Hauv kev kho mob cov ntaub ntawv txheej,Vilon Acetatecopolymer yog siv nyob rau hauv tshuaj -eluting stent coatings, artificial coatings coatings, thiab lub qhov txhab hnav khaub ncaws. Tshuaj-eluting stent coatings: EVA copolymers loaded nrog anti- cov tshuaj proliferative xws li rapamycin thiab paclitaxel yog coated rau ntawm stent nto. Tom qab cog rau hauv cov hlab ntsha, cov tshuaj maj mam tso tawm, inhibiting vascular endothelial proliferation thiab txo nyob rau hauv -stent restenosis tus nqi. Cov kab mob hnav khaub ncaws: PVAc emulsion yog coated rau saum npoo ntawm cov ntaub uas tsis yog ntaub, muab cov kab mob tua kab mob, moisturizing, thiab kho kom zoo- txhawb kev cuam tshuam. Siv rau kub hnyiab thiab mob, nws accelerates lub sij hawm kho los ntawm 20% -30%.
Xaus
Vilon Acetate, nrog nws cov qauv molecular tshwj xeeb ntawm ob npaug -bond-ester conjugated system, tsim kom muaj cov txheej txheem tseem ceeb ntawm "tswj polymerization- biodegradation- tshuaj sib cuam tshuam," ua rau nws ua haujlwm raws li kev siv tshuaj, kev sib koom ua ke, kev kho mob, thiab kev tsim khoom lag luam. unsaturated ester APIs. Nws muaj zog heev ob daim ntawv cog lus, biodegradable ester pawg, thiab tsis tshua muaj steric hindrance ntawm qib molecular nteg lub hauv paus rau kev yooj yim polymerization, customization, thiab kev nyab xeeb nrog tsawg toxicity. Nws cov txheej txheem ntawm kev ua haujlwm tso siab rau cov dawb radical polymerization los tswj cov khoom siv, ester bond hydrolysis kom paub tseeb tias biosafety, thiab tsis yog -covalent kev sib cuam tshuam kom ua tiav cov tshuaj thauj khoom, ntsuas kev ua tau zoo thiab kev nyab xeeb, yog li muaj ob tus nqi ntawm ob qho tib si raw khoom thiab excipient. Nws daim ntawv thov nthuav dav cov tshuaj formulations, cov ntaub ntawv kho mob, thiab biosynthesis, nrog rau kev lag luam loj loj. Txiav-kev tshawb fawb ntug tsom mus rau cov txheej txheem ntsuab, siab{11}} cov ntaub ntawv kawg, kev xa khoom ntse, thiab bio{12}}raws li lwm txoj hauv kev, tsis tu ncua los ntawm kev ua haujlwm tsis zoo ntawm cov khoom lag luam ib txwm muaj.
Xi'an Faithful Biotechnology Co., Ltd. muab cov thev naus laus zis ntau lawm nrog cov txheej txheem kev lees paub zoo los muab siab - zooVilon Acetateuas ua tau raws li cov qauv tshuaj thoob ntiaj teb. Peb tau cog lus tias yuav muab cov nqi sib tw thiab kev txhawb nqa kev qhia dav dav, ua rau peb tus khub nyiam rau cov tsev kho mob thiab cov kws tshawb fawb thoob ntiaj teb. Thov hu rau peb pab neeg technical (allen@faithfulbio.com) kom paub seb peb cov khoom tuaj yeem txhim kho koj cov qauv li cas.
Hauv qab no yog cov npe ntawm cov ntaub ntawv tshawb fawb tseem ceeb uas kuv tau hais txog thiab tso siab rau hauv kev sau tsab xov xwm no. Cov ntawv tshaj tawm no muab pov thawj kev tshawb fawb txhim khu kev qha rau kev ua tau zoo thiab cov txheej txheem hais hauv kab lus no.
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