Hydroxypropyl methylcellulose (INN igoa: Hypromellose), fa'afaigofie fo'i e pei o le hypromellose (hydroxypropyl methylcellulose, fa'apu'upu'u e peiHPMC), o se ituaiga o ethers fefiloi nononionic cellulose. Ose polymer semi-synthetic, inactive, viscoelastic e masani ona fa'aogaina e fai ma lubricant i le ophthalmology, po'o se fa'aoga po'o se fesoasoani i vaila'au tu'u gutu, ma e masani ona maua i oloa fa'apisinisi eseese.
I le avea ai o se mea'ai fa'aopoopo, e mafai e le hypromellose ona fa'atino vaega nei: emulsifier, mafiafia, so'o fa'amautu ma sui mo gelatin manu. O lona code (E-code) i le Codex Alimentarius o le E464.
mea tau vaila'au:
O le oloa mae'a ohydroxypropyl methylcelluloseo le pa'epa'e pa'epa'e po'o le pa'epa'e fa'asa'o fibrous solid, ma o le lapopo'a e pasi atu i le sieve 80-mesh. O le fua faatatau o le methoxyl anotusi i le hydroxypropyl anotusi o le oloa maeʻa e ese, ma le viscosity e ese, o lea e avea ma ituaiga eseese ma faatinoga eseese. E i ai uiga o le soluble i le vai malulu ma le le mafai ona solu i le vai vevela e pei o le methyl cellulose, ma o lona solubility i solu faʻaletino e sili atu nai lo le vai. E mafai ona solo i le anhydrous methanol ma ethanol, ma e mafai foi ona solo i chlorinated hydrocarbons e pei o le dichloro methane, trichloroethane, ma solvents organic pei o le acetone, isopropanol, ma le diacetone alcohol. A fa'amavae i totonu o le vai, o le a tu'ufa'atasia ma mole mole vai e fai ai se colloid. E mautu i le acid ma alkali, ma e le afaina i le tele o pH = 2 ~ 12. O le Hypromellose, e ui lava e le o'ona, e mu ma fete'ena'i fa'amalosi i vaila'au fa'ama'i.
O le viscosity o oloa HPMC e faʻateleina i le faʻateleina o le faʻatonuga ma le mamafa mole, ma a oʻo i luga le vevela, o lona viscosity amata ona faʻaitiitia. A oʻo i se vevela faʻapitoa, e faʻafuaseʻi ona oso aʻe le viscosity ma tupu ai le gelation. maualuga o. O lona vaifofo vai e mautu i le vevela o le potu, vagana ai e mafai ona faʻaleagaina e enzymes, ma o lona viscosity lautele e leai se mea faʻaleagaina. O lo'o i ai fa'apitoa fa'amalama fa'apitoa, mea lelei e fai ata tifaga ma gaioiga i luga.
Faia:
A maeʻa ona togafitia le cellulose i le alkali, o le alkoxy anion e mafua mai i le deprotonation o le hydroxyl group e mafai ona faʻaopoopoina le propylene oxide e gaosia ai le ether hydroxypropyl cellulose; e mafai foi ona condense ma methyl chloride e gaosia methyl cellulose ether. O le Hydroxypropyl methylcellulose e gaosia pe a fa'atino tali e lua i le taimi e tasi.
Fa'aaogā:
O le faʻaogaina o le hydroxypropyl methylcellulose e tutusa ma isi ethers cellulose. E masani ona faʻaaogaina e avea o se dispersant, faʻamalolo le tumau, mafiafia, emulsifier, stabilizer ma faʻapipiʻi i vaega eseese. E sili atu nai lo isi cellulose ethers i tulaga o le solubility, dispersibility, manino ma le enzyme resistance.
I totonu o meaʻai ma falemaʻi, e faʻaaogaina e fai ma faʻaopoopoga. E faʻaaogaina e avea o se mea faʻapipiʻi, mafiafia, faʻasalalau, Emollient, stabilizer 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 le polymerization resin synthetic, petrochemicals, ceramics, papermaking, paʻu, cosmetics, coatings, mea fau fale ma ipu lomitusi photosensitive.
Taimi meli: Apr-25-2024