Polyethyleneimine(PEI luv luv), nrog tus lej CAS ntawm 9002-98-6, yog cov polymer cationic uas yaj tau hauv dej. Nws lub ntsiab lus tseem ceeb yog tias nws cov saw hlau muaj ntau pawg amino (amines thawj, amines theem ob, thiab amines theem peb). Cov qauv no txiav txim siab nws cov alkalinity muaj zog, reactivity siab, thiab cov khoom tshwj xeeb physicochemical. Polyethyleneimine muaj txiaj ntsig zoo rau kev siv hauv ntau qhov chaw.
I. Cov Ntaub Ntawv Tseem Ceeb: Cov Qauv thiab Kev Faib Pawg
1. Cov qauv tshuaj lom neeg
Lub chav rov ua dua ntawm PEI yog -CH₂CH₂NH-, thiab cov amino pawg ntawm nws cov saw molecular muab nws cov khoom cationic muaj zog (pKa≈10) - txawm tias nyob rau hauv cov xwm txheej nruab nrab lossis tsis muaj zog acidic, cov amino pawg tuaj yeem protonated (-NH₂→-NH₃⁺), uas yog qhov tseem ceeb ntawm nws cov dej solubility, complexation muaj peev xwm thiab nto adsorption.
Raws li cov qauv sib txawv, lawv feem ntau muab faib ua ob pawg:
Polyethyleneimine Linear (L-PEI): Cov saw molecular yog linear, nrog rau cov amines theem nrab ua pawg amino tseem ceeb (kwv yees li 90%), thiab qhov sib piv ntawm cov amines thawj zaug thiab theem peb yog qis. Qhov kev faib tawm ntawm cov molecular mass yog nqaim, thiab qhov huv siab dua.
Cov polyethyleneimine ceg (B-PEI): Cov saw hlau molecular muaj ntau cov saw hlau sab, nrog rau qhov sib npaug ntawm cov amines thawj zaug (≈25%), cov amines theem nrab (≈50%), thiab cov amines theem nrab (≈25%), thiab muaj kev ua haujlwm siab dua. Nws yog hom siv ntau tshaj plaws hauv kev lag luam.
2. Cov khoom tseem ceeb ntawm lub cev
| Xwm | Tus nqi ib txwm muaj (ceg PEI) |
| Qhov tsos | Cov kua nplaum daj ntseg mus rau xim av (qhov hnyav molecular qis) lossis khoom khov (qhov hnyav molecular siab) |
| Kev yaj dej | PEIyooj yim soluble hauv cov kuab tshuaj polar xws li dej, ethanol thiab methanol, tab sis tsis yaj hauv cov kuab tshuaj uas tsis yog polar |
| Qhov hnyav ntawm cov molecular | Ntau pua txog ntau pua txhiab (feem ntau yog 1,000 txog 25,000 Da) |
| Qhov Ceev (25 ℃) | 1.05 txog 1.10 g/cm³ |
| Cov ntsuas kev hloov pauv (25 ℃) | 1.50 ~ 1.52 |
| Kev lom | PEI uas muaj qhov hnyav tsawg molecular muaj qhov tsis tshua muaj tshuaj lom, thaum PEI uas muaj qhov hnyav ntau molecular/branched muaj qee yam cytotoxicity rau cov cell. |
II. Cov Ntsiab Lus Tseem Ceeb: Vim li cas PEI thiaj siv dav?
Cov khoom muaj zog cationic thiab muaj peev xwm ua kom sib xyaw: Cov amino pawg tom qab protonation nqa lub zog zoo thiab tuaj yeem tsim cov khoom sib xyaw ruaj khov nrog cov tshuaj tsis zoo (xws li DNA, RNA, anionic dyes, av nplaum, thiab cov hlau ions), uas yog lub hauv paus tseem ceeb ntawm nws txoj haujlwm hauv kev xa cov noob caj noob ces, kev kho dej, thiab kev nqus hlau.
Kev ua haujlwm siab: Cov pab pawg amino (tshwj xeeb tshaj yog cov amines thawj zaug) tuaj yeem koom nrog ntau yam kev ua haujlwm (xws li Michael ntxiv, epoxy nplhaib-qhib, acylation, crosslinking reactions), thiab tuaj yeem siv ua cov neeg sawv cev crosslinking thiab cov hloov kho kom ua haujlwm ntawm cov khoom siv.
Kev yaj dej thiab cov yam ntxwv ntawm zaj duab xis: Kev yaj dej zoo ua rau nws yooj yim rau kev ua. Tom qab ziab, nws tuaj yeem tsim cov zaj duab xis ntom ntom, thiab cov zaj duab xis muaj qee yam kev nplaum thiab kev thaiv.
Muaj zog alkalinity: Cov amino pawg loj hauv lub molecule ua rau nws cov kua dej muaj zog alkaline (pH≈10 txog 12), thiab nws tuaj yeem dhau los ua cov tshuaj tiv thaiv neutralization nrog cov tshuaj acidic.
III.Polyethylenimine siv rau dab tsi(Muab faib ua pawg raws li qhov xav tau
1. Kev kho mob hauv lub cev (Lub hauv paus: Cov kab mob xa cov noob caj noob ces
PEI yog ib qho ntawm cov vectors gene non-viral uas siv ntau tshaj plaws tam sim no:
Lub Ntsiab Cai Cationic PEI thiab anionic DNA/RNA tsim ib qho "PEI-nucleic acid complex" los ntawm kev sib cuam tshuam electrostatic, uas tsis yog tsuas yog tiv thaiv nucleic acids los ntawm kev puas tsuaj los ntawm nucleases tab sis kuj ua rau lawv nkag mus rau hauv cov hlwb los ntawm endocytosis. Ntxiv mus, "proton sponge effect" ntawm PEI (nqus cov protons hauv lub hlwb tom qab protonation) Kev ua rau vesicle tawg tuaj yeem txhawb kev tso tawm ntawm nucleic acids rau hauv cytoplasm;
Daim Ntawv Thov: Kev kho mob noob caj noob ces (xws li kev xa noob caj noob ces rau cov qog nqaij hlav thiab cov kab mob caj ces), kev xa tshuaj tiv thaiv nucleic acid, kev sim hloov hlwb (feem ntau siv PEI transfection reagent hauv chaw soj nstuam);
Lus Cim: Cov PEI uas muaj molecular hnyav ntau muaj cytotoxicity siab. Tam sim no, cov PEI uas hloov kho tsis muaj tshuaj lom (xws li peG-modified PEI thiab cross-linked PEI nanoparticles) tau tsim tawm.
2. Kev kho dej (Core: Flocculants, Adsorbents)
Flocculant: Cov khoom cationic ntawmPolyethylenimine PEINws tuaj yeem tshem tawm cov khoom me me uas raug tshem tawm hauv dej (xws li xuab zeb, cov organic matter, thiab cov kab mob), ua rau cov khoom me me sib sau ua ke thiab poob qis. Nws yog siv rau kev ntxuav dej haus thiab kev kho cov dej khib nyiab hauv kev lag luam (xws li kev luam ntawv thiab kev zas xim, cov dej khib nyiab ua ntawv), tshwj xeeb tshaj yog tsim rau kev kho cov dej khib nyiab uas muaj cov organic ntau thiab cov organic ntau.
Cov Khoom Siv Nqus Tau Cov amino pawg ntawm Polyethylenimine PEI tuaj yeem tsim cov kev sib txuas lus nrog cov hlau hnyav ions (xws li Cu²⁺, Ni²⁺, Cr⁶⁺, Pb²⁺), thiab tuaj yeem siv rau kev tshem tawm cov hlau hnyav hauv cov dej khib nyiab kev lag luam. Nws kuj tseem tuaj yeem ua rau cov khoom siv adsorption polyethylenimine hloov kho (xws li PEI-activated carbon, PEI-nanofibers) los txhim kho lub peev xwm adsorption.
3. Thaj chaw ntawm kev hloov kho qhov chaw ntawm cov khoom siv (Lub hauv paus: Kev Hloov Kho Kev Ua Haujlwm)
Kev hloov kho ntawv/Fiber: Kev kho polyethylenimine PEI ntawm daim ntawv tuaj yeem txhim kho nws lub zog ntub, tiv taus dej thiab luam tawm tau (los ntawm kev sib txuas nrog cov pab pawg hydroxyl ntawm qhov chaw fiber), thiab siv rau hauv kev tsim cov ntawv tshwj xeeb (xws li ntawv ntim khoom, ntawv lim).
Kev kho qhov chaw ntawm cov hlau: Polyethylenimine tuaj yeem tsim ib zaj duab xis tiv thaiv rau ntawm qhov chaw ntawm cov hlau, ua kom cov hlau tsis kam tiv taus corrosion, thiab tseem tuaj yeem ua haujlwm ua tus txhawb nqa rau cov txheej hlau.
Kev hloov kho cov khoom siv polymer: PEI yog siv los ua tus neeg sawv cev crosslinking lossis compatibilizer los txhim kho qhov sib xws thiab kev nplaum ntawm cov polymers (xws li kev hloov kho crosslinking ntawm polyurethane thiab epoxy resins), lossis los txhim kho hydrophilicity ntawm cov ntaub ntawv (xws li PEI-modified polyolefin zaj duab xis).
4. Lwm yam kev siv hauv kev lag luam
Cov nplaum thiab cov khoom siv foob: Cov amino pawg ntawm PEI tuaj yeem dhau los ntawm kev sib txuas lus nrog aldehydes, isocyanates, thiab lwm yam, thiab tuaj yeem siv ua tus neeg sawv cev rau cov nplaum dej. Polyethylenimine yog siv rau kev sib txuas ntoo, ntawv, thiab hlau, nrog lub zog sib txuas siab thiab tiv taus dej zoo.
Kev lag luam zas xim thiab xim: Polyethylenimine PEI tuaj yeem siv los ua cov khoom siv kho rau cov xim cationic (tshwj xeeb tshaj yog rau kev zas xim cov fiber ntuj xws li paj rwb thiab txhob lo lo ntxhuav), txhim kho kev nplaum thiab kev ntxuav ntawm cov xim; Polyethylenimine kuj tseem tuaj yeem siv los ua cov xim dispersant los tiv thaiv cov xim sib sau ua ke.
Kev rho tawm roj av: PEI siv rau hauv kev kho dej hauv cov roj av (xws li kev kaw dej thiab cov neeg sawv cev tswj cov qauv), lossis ua cov kua dej drilling kom txhim kho kev ruaj khov ntawm cov kua dej drilling.
Los ntawm kev kho qhov hnyav molecular (qhov hnyav molecular qis, tsis muaj tshuaj lom; qhov hnyav molecular siab, kev ua haujlwm siab), cov qauv (linear vs. branched), thiab cov txheej txheem hloov kho (peG-ylation, cross-linking, thiab compounding) ntawmpolyethylenimine, nws daim ntawv thov hauv cov teb siab kawg (xws li kev xa tshuaj thiab cov ntaub ntawv tshwj xeeb) tuaj yeem nthuav dav ntxiv.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-21-2025