Hydroxypropyl methylcellulose(igoa INN:Hypromellulose), fa'apu'upu'u fa'apeahydroxypropyl methylcellulose (HPMC), o se ituaiga e le'o ionic cellulose fefiloi ethers. Ose polymer semi synthetic, inactive, viscoelastic e masani ona fa'aogaina e fai ma lubricant i le ophthalmology, po'o se fa'aopoopoga po'o se fesoasoani i vaila'au tu'u gutu, e masani ona maua i ituaiga o oloa eseese.
I le avea ai o se meaʻai faaopoopo, hydroxypropyl methylcellulose e mafai ona faia matafaioi nei: emulsifier, mafiafia, sui faʻamalolo, ma se sui mo gelatin manu. O lona Codex Alimentarius code o le E464.
mea tau kemisi
O le oloa mae'a ohydroxypropyl methyl celluloseose pa'epa'e pa'epa'e po'o le pa'epa'e fa'asa'o fibrous malo, fa'atasi ai ma se lapopo'a e ui atu i le sieve 80 mesh. O fua faatatau eseese o le methoxy ma le hydroxypropyl mea e aofia ai ma le viscosity o le oloa maeʻa e avea ai ma ituaiga eseese ma eseesega i le faatinoga. E i ai uiga o le soluble i le vai malulu ma e le mafai ona solu i le vai vevela e pei o le methylcellulose, ma o lona solubility i solu faʻaletino e sili atu nai lo le vai. E mafai ona solu i le anhydrous methanol ma ethanol, faapea foi chlorinated hydrocarbons e pei o le dichloromethane, trichloroethane, ma solvents organic pei ole acetone, isopropanol, ma le diacetone alcohol. A fa'amavae i le vai, e tu'u fa'atasi ma mole mole vai e fai ai se colloid. E mautu i acids ma fa'avae ma e le afaina i totonu o le pH 2-12. E ui lava o le hydroxypropyl methylcellulose e le oona, e mu ma e mafai ona faʻafefeteina ma faʻamaʻi faʻamaʻi [5].
O le viscosity oHPMC oloafaʻateleina i le faʻateleina o le faʻatonuga ma le mamafa mole. A maualuga le vevela, e amata ona paʻu le viscosity. A oʻo le vevela i se vevela faʻapitoa, e faʻafuaseʻi ona oso aʻe le viscosity ma tupu ai le gel. O le vevela o le gel o oloa la'ititi maualalo e maualuga atu nai lo le maualuga o oloa viscosity. O lona vaifofo vai e mautu i le vevela o le potu ma e masani lava e leai se fa'aleagaina o le viscosity vagana ai le fa'aleagaina o le enzymatic. O lo'o iai mea fa'apitoa fa'afefe gelling, lelei ata tifaga fa'atinoina ma gaioiga i luga.
Sauniuniga
A maeʻa ona togafitia le cellulose i le alkali, o le alkoxy anion na gaosia e le hydroxyl deprotonation e mafai ona faʻaopopo i le epoxy propane e gaosia ai.hydroxypropyl cellulose eter; E mafai foʻi ona faʻafefete i le methyl chloride e maua ai le methyl cellulose ether. Pe a tutupu fa'atasi tali e lua,hydroxypropyl methyl celluloseua gaosia.
faamoemoe
Le fa'aogaina ohydroxypropyl methyl cellulosee tutusa ma isiselulosa ethers, e masani ona faʻaaogaina e avea o se faʻasalalau, faʻamalolo faʻamalolo, mafiafia, emulsifier, stabilizer, ma faʻapipiʻi i vaega eseese. E sili atu nai lo isi cellulose ethers i tulaga o le solubility, dispersibility, transparency, ma le enzyme resistance.
I totonu o meaʻai ma falemaʻi, e faʻaaogaina e fai ma faʻaopoopoga. Ona o ona mea faʻapipiʻi, mea e fai ata tifaga, mafiafia ma faʻasalalau i vai, faʻapea foʻi ma lona gafatia e puipuia ai le suauʻu ma tausia le susu, e faʻaaogaina e pei o se faʻapipiʻi, mafiafia, faʻasalalau, faʻamalolo, faʻamautu, ma emulsifier. E leai se oona, leai se aoga o mea'ai, ma e leai ni suiga ole metabolic.
I le male,HPMCo loʻo i ai faʻaoga i tali faʻapipiʻi polymerization resin, petrochemicals, ceramics, papermaking, paʻu, cosmetics, coatings, mea fau fale, ma ipu lomitusi photosensitive.
Taimi meli: Sep-04-2023