Methylcellulose (MC)thiabhydroxypropyloosylcelylulose (HPMC)Yog ob qho tib si cellulose derivatives, uas tau siv dav hauv cov zaub mov, tshuaj, tshuaj pleev ib ce, kev tsim kho thiab kev lag luam. Txawm hais tias lawv cov qauv tshuaj yooj yim tau los ntawm cellulose, muaj qee qhov kev sib txawv hauv cov tshuaj chem zeb, cov khoom siv lub cev thiab cov chaw thov kev thov.
1. Cov qauv siv tshuaj sib txawv
Methylcellulose (MC) yog ua los ntawm kev hloov ib feem ntawm hydroxyl (-oh) pawg ntawm cellulose molecule nrog methyl (-och3) pawg. Cov qib ntawm methylation tuaj yeem tswj tau, feem ntau qhia raws li kev kawm methylation. Cov qauv ntawm MC kuj yooj yim, feem ntau yog cov pab pawg hydroxyl ntawm lub cellulose molecular chart yog hloov los ntawm methylated pawg.
HydroxyPropyyl methylcellose (HPMC) yog ua raws li methylation, thiab txuas ntxiv hloov ib feem ntawm cov xov tooj ntawm hydroxule nrog hydroxypropyl (-c3h7H) pawg. Yog li ntawd, HPMC yog ib qho kev sib tw ntawm methylcellulose, tab sis muaj ntau cov qauv txheej txheem. HPMC muaj ob pab pawg, methyl thiab hydroxypropyl, yog li nws cov qauv yog ntau dua li MC.
2. Lub zog lub cev thiab solubility
Solubility:
Methylcellulose tuaj yeem tsim cov tshuaj colloidal hauv dej txias, tab sis nws tsis yooj yim kom yaj hauv dej kub. Nws cov solubility yog cuam tshuam heev los ntawm cov dej kub thiab lub pH nqi ntawm dej, tshwj xeeb tshaj yog thaum lub sijhawm kub, lub solubility ntawm MC yuav txo qis.
HydroxyPropyyl methylcellose muaj solubility zoo dua. Nws tuaj yeem ua ib qho kev daws teeb meem nyob hauv dej txias, thiab nws solubility kuj qhia tau zoo nyob rau hauv cov kev hloov ntawm dej ph thiab kub. HPMC muaj cov dej solubility superior solubility thiab tuaj yeem yaj hauv qhov chaw dav dav, tshwj xeeb tshaj yog hauv dej sov.
Viscosity:
Methylcellulose tov muaj cov viscosity qis, yog li nws feem ntau siv hauv qee cov ntawv thov uas xav tau qis viscosity.
Hydroxypropy Kev daws teeb meem feem ntau muaj cov visccity ntau dua, uas yuav tsum muaj visccosity ntau dua, xws li kev npaj tshuaj ntau dua thiab cov ntawv nplaum hauv cov ntaub ntawv hauv tsev.
Gelling Cov Khoom:
Methylcellulose muaj qhov tshwm sim ua kom muaj txiaj ntsig, uas yog, nws yuav tsim cov tshuaj colloidal tom qab cua sov, thiab yaj dua thaum qhov ntsuas kub. Yog li ntawd, nws feem ntau siv los ua tus sawv cev ntawm cov zaub mov thiab tshuaj.
HydroxyPropyyl methylulose feem ntau tsis muaj thermal gelation tshwm sim tshwm sim, thiab nws nyhav los ua cov tshuaj ruaj khov hauv dej ntau dua li cov gel.
3. Cov chaw thov
Kev Lag Luam Khoom Noj:
Methylcellulose feem ntau yog siv hauv cov zaub mov txhawm rau txhim kho cov khoom noj kom zoo, ntxiv vencosity thiab tswj cov qauv khoom noj. Piv txwv li, nws tuaj yeem siv rau hauv cov khoom noj muaj calorie tsawg, mis nyuj khov thiab nqaij tsis nqaij nqaij. Vim nws cov cua sov gelation cov khoom, nws kuj tseem siv tau ua tus sawv cev ntawm cov zaub mov.
HydroxyPropyyl methylulose tsis tshua siv nyob rau hauv cov zaub mov, tab sis nws kuj tseem siv tau rau qee cov zaub mov tshwj xeeb, xws li moisturizers thiab emulsifiers.
Kws Kev Lag Luam:
Methylcellulose feem ntau siv los ua ib qho kev zam rau cov tshuaj, tshwj xeeb tshaj yog nyob rau hauv cov ntsiav tshuaj, tsiav tshuaj thiab tshuaj pleev. Nws kuj tseem tuaj yeem siv los ua tus neeg sawv cev tawm-tso tawm rau cov tshuaj ophthalmic los pab kom muaj kev ua kom lub sijhawm ua yeeb yam.
HydroxyPropyyl methylulose yog dav siv kev npaj tshuaj, tshwj xeeb tshaj yog nyob rau hauv cov ntsiav tshuaj, tsiav tshuaj thiab npaj ua kua. Nws ua lub luag haujlwm tseem ceeb hauv kev siv tshuaj yeeb-tso tawm thiab cov tshuaj tawm tswv yim. Tsis tas li ntawd, HPMC feem ntau yog siv siv cov tshuaj ophthalmic thiab cov tshuaj tua mob mucosal.
Kev Lag Luam Kev Tsim Kho Kev Tsim Kho:
Methylcellulose yog tsuas yog siv los ua cov tuab thiab dej-khaws cia tus neeg sawv cev rau cov ntaub ntawv tsim tsev xws li Minks thiab Gypsum hauv kev tsim kho. Nws tuaj yeem txhim kho cov khoom ua ke thiab ua haujlwm ntawm cov ntaub ntawv no.
HydroxyPropyyl methylulose yog cov khoom siv ntau dua hauv cov khoom lag luam hauv tsev, tshwj xeeb tshaj yog cov khoom lag luam nplais thiab cov tshuaj nplaum qhuav, uas tuaj yeem muab cov dej ua kom tiav dua.
Kev Lag Luam Kev Lag Luam:
MCFeem ntau siv los ua tuab, nyiam thiab emulsifier hauv tshuaj pleev ib ce los txhim kho daim tawv nqaij ua kom zoo nkauj thiab ua kom muaj kev cuam tshuam.
HPMCFeem ntau siv hauv cov khoom tu tawv nqaij thiab cov khoom siv plaub hau, tshwj xeeb tshaj yog cov khoom lag luam xws li gels, cream thiab tshuaj zawv plaub hau, uas tuaj yeem muab cov qauv zoo thiab cov nyhuv zoo dua.
Txawm hais tias methylcellulose (MC) thiab hydroxypropylulose (HPMC) yog cov khoom siv tshuaj txhuam hniav thiab lub cev muaj ntau dua, ua rau cov ntawv thov sib txawv. Mc feem ntau muaj qis viscosity thiab thermal gelling cov zog, thiab yog qhov tsim nyog rau kev siv ua tus sawv cev ntawm tus neeg sawv cev thiab cov tuab tuab; Thaum HPMC muaj cov solubility zoo dua thiab feem ntau siv nyob rau hauv cov ntawv thov uas yuav tsum viscosity thiab muaj kev ruaj khov ntau dua, tshwj xeeb hauv kev lag luam lag luam thiab kev tsim kho. Raws li kev siv sib txawv kev siv, xaiv cellule cellule derivatives tuaj yeem ua tau zoo dua cov kev xav tau ntawm cov ntawv thov.
Lub Sijhawm Post: Feb-19-2025