HydroxyPropyyl methylulose, feem ntau yog hu ua HPMC, yog ib tus neeg siv dav ntawm cov kws tshuaj uas muaj kev zam thiab khoom noj ntxiv. Vim nws cov khoom siv solubility zoo, binding muaj peev xwm thiab ua yeeb yaj kiab-ua yeeb yam, nws tau siv dav hauv kev lag luam kws tshuaj. HPMC kuj muaj feem ntau siv hauv kev lag luam khoom noj ua cov tuab tuab, emulsifier thiab stabilizer thiab stabilizer. Lub purity HPMC yog qhov tseem ceeb tshaj plaws hauv lub tsev tshuaj thiab kev lag luam khoom noj thaum nws cuam tshuam rau kev ua haujlwm tau zoo thiab kev nyab xeeb ntawm cov khoom. Kab lus no yuav tham txog kev txiav txim siab HPMC kev coj dawb huv thiab nws cov hau kev.
HPMC yog dab tsi?
Hydroxypropylraylcellulose (HPMC) yog lub cellulose ether derived los ntawm methylcellulose. Nws cov molecular hnyav yog 10,000 rau 1,000,000 daltons, thiab nws yog cov hmoov dawb lossis tawv nqaij dawb, tsw ntxhiab thiab tsis muaj qab. HPMC yog yooj yim soluble hauv dej, thiab kuj soluble hauv qee cov kuab tshuaj ethanic, butanol, thiab chloroform. Nws muaj qee cov khoom lag luam tshwj xeeb xws li dej cia, thickening thiab khi muaj peev xwm, uas ua rau nws zoo tagnrho rau cov khoom lag luam thiab khoom noj.
Kev Txiav Txim Siab HPMC Purity
Lub purity hpmc nyob ntawm ntau yam xws li qib ntawm kev hloov pauv (DS), cov ntsiab lus noo noo thiab cov ntsiab lus ntoo tshauv. DS sawv cev rau cov pab pawg hydroxyl hloov los ntawm hydroxyproproreyl hauv lub cellulose molecule. Ib qib siab ntawm kev hloov pauv ua rau solubility ntawm HPMC thiab txhim kho kev ua yeeb yaj kiab zaj duab xis. Hloov siab, cov qib qis qis ntawm kev hloov pauv yuav ua rau txo cov solubility thiab tsis zoo zaj duab xis-ua yeeb yaj kiab.
HPMC Purity Twv Txoj Kev
Muaj ntau txoj hauv kev los txiav txim siab txog HPMC, suav nrog kev tsom xam-panratography (HPLC), thiab infrared spectroscopy (ir). Nov yog cov ntsiab lus rau txhua txoj kev:
Acid-Paus Paus
Cov txheej txheem yog ua raws cov tshuaj tiv thaiv nruab nrab ntawm cov acidic thiab cov pab pawg theem pib hauv HPMC. Ua ntej, HPMC yog yaj nyob rau hauv cov kuab tshuaj thiab cov lus paub ntawm ib qho kua qaub los yog lub hauv paus tshuaj ntawm kev paub meej yog ntxiv. Lub tsev pheeb suab tau nqa tawm kom txog thaum lub xov tooj ntawm lub mis. Los ntawm cov nyiaj ntawm cov kua qaub los yog puag noj haus, qib degree hloov chaw tuaj yeem suav tau.
Kev Ntsuam Xyuas
Elemental analysis measures the percentage of each element present in a sample, including carbon, hydrogen, and oxygen. Cov degree ntawm kev hloov pauv tuaj yeem suav los ntawm qhov nyiaj ntawm txhua lub ntsiab tam sim no hauv HPMC piv txwv piv txwv.
Kev ua kom zoo ua kua chromatography (HPLC)
HPLC yog cov txheej txheem siv analytical uas cais cov khoom sib xyaw ua ke ntawm kev sib xyaw ua ke raws li lawv cov kev cuam tshuam nrog lub thav duab nyob ruaj khov thiab phad. Hauv HPMC, cov qib hloov pauv tau tuaj yeem suav los ntawm kev ntsuas qhov sib piv ntawm hydroxypropyl rau methyl pawg hauv ib qho qauv.
Infrared spectroscopy (ir)
Infrared spectroscopy yog ib qho kev ntsuas tshuaj uas ntsuas qhov nqus lossis kis tau hluav taws xob hauv hluav taws xob los ntawm cov qauv. HPMC muaj cov kev nqus tau sib txawv rau hydroxyl, methyl thiab hydroxypropyl, uas tuaj yeem siv los txiav txim siab txog qib kev hloov pauv.
Lub purity hpmc yog qhov tseem ceeb hauv kev lag luam thiab kev txiav txim siab, thiab nws qhov kev txiav txim siab yog qhov tseem ceeb los ua kom muaj kev nyab xeeb thiab ua tau zoo ntawm cov khoom kawg. Muaj ntau txoj hauv kev muaj los txiav txim siab txog HPMC, suav nrog cov kua qaub-puag, kev tsom xam ntawm kev tshawb fawb, HPLC, thiab IR. Txhua txoj kev muaj nws tus kheej zoo thiab qhov tsis zoo thiab tuaj yeem raug xaiv raws li cov kev cai tshwj xeeb ntawm daim ntawv thov. Txhawm rau saib xyuas lub purity hpmc, nws yuav tsum muab cia rau hauv qhov chaw qhuav, txias ntawm tshav ntuj thiab lwm yam paug.
Lub Sijhawm Post: Lub Yim Hli-25-2023