Na ua tseba ka hypromellose?

Hydroxypropyl methylcellulose (INN lebitso: Hypromellose), hape e nolofalitsoeng joalo ka hypromellose (hydroxypropyl methylcellulose, e khutsufalitsoeng joalo kaHPMC), ke mefuta e fapaneng ea li-ether tse fapaneng tsa cellulose tse tsoakiloeng. Ke semi-synthetic, e sa sebetseng, viscoelastic polymer e atisang ho sebelisoa e le setlolo sa ophthalmology, kapa e le ntho e thusang kapa e thusang litlhare tsa molomo, 'me hangata e fumanoa lihlahisoa tse fapaneng tsa khoebo.

E le tlatsetso ea lijo, hypromellose e ka bapala likarolo tse latelang: emulsifier, thickener, suspending agent le sebaka sa gelatin ea liphoofolo. Khoutu ea eona (E-code) ho Codex Alimentarius ke E464.

Lintho tsa lik'hemik'hale:

Sehlahisoa se felileng sahydroxypropyl methylcelluloseke phofo e tšoeu kapa e tšoeu e hlephileng e tiileng, 'me boholo ba karoloana bo feta har'a sieve ea 80-mesh. Karolelano ea litaba tsa methoxyl ho hydroxypropyl ea sehlahisoa se felileng e fapane, 'me viscosity e fapane, kahoo e fetoha mefuta e sa tšoaneng e nang le mekhoa e fapaneng. E na le litšoaneleho tsa ho qhibiliha metsing a batang le ho se qhibilihe metsing a chesang a tšoanang le methyl cellulose, 'me ho qhibiliha ha eona ka har'a lihlahisoa tsa tlhaho ho feta metsi. E ka qhibiliha ka methanol ea anhydrous le ethanol, hape e ka qhibiliha ka li-hydrocarbon tse chlorinated tse kang dichloro methane, trichloroethane, le metsoako ea tlhaho e kang acetone, isopropanol le diacetone joala. Ha e qhibiliha ka metsing, e tla kopana le limolek'hule tsa metsi ho etsa colloid. E tsitsitse ho acid le alkali, 'me ha e amehe ka mefuta e fapaneng ea pH = 2 ~ 12. Hypromellose, le hoja e se chefo, e ka tuka 'me e sebetsa ka mabifi ha e na le li-oxidizing agents.

Viscosity ea lihlahisoa tsa HPMC e eketseha ka ho eketseha ha mahloriso le boima ba limolek'hule, 'me ha mocheso o phahama, viscosity ea eona e qala ho fokotseha. Ha e fihla mocheso o itseng, viscosity e phahama ka tšohanyetso 'me gelation e etsahala. bophahamo ba. Tharollo ea eona ea metsi e tsitsitse mocheso oa kamore, ntle le hore e ka senyeha ka li-enzyme, 'me viscosity ea eona e akaretsang ha e na ts'ebetso ea ho senyeha. E na le thepa e khethehileng ea gelation ea mocheso, thepa e ntle ea ho etsa filimi le mosebetsi oa holim'a metsi.

Ho etsa:

Ka mor'a hore cellulose e phekoloe ka alkali, alkoxy anion e hlahisoang ke ho senyeha ha sehlopha sa hydroxyl e ka eketsa propylene oxide ho hlahisa hydroxypropyl cellulose ether; e ka boela ea kopana le methyl chloride ho hlahisa methyl cellulose ether. Hydroxypropyl methylcellulose e hlahisoa ha karabelo ka bobeli e etsoa ka nako e le 'ngoe.

Sebelisa:

Tšebeliso ea hydroxypropyl methylcellulose e tšoana le ea li-cellulose ethers tse ling. Haholo-holo e sebelisoa e le dispersant, suspending agent, thickener, emulsifier, stabilizer le sekhomaretsi masimong a sa tšoaneng. E phahametse tse ling tsa cellulose ethers mabapi le ho solubility, dispersibility, pepeneneng le ho hanyetsa li-enzyme.

Ka indasteri ea lijo le ea meriana, e sebelisoa e le tlatsetso. E sebelisoa e le sekhomaretsi, thickener, dispersant, Emollient, stabilizer le emulsifier. Ha e na chefo, ha e na boleng ba phepo e nepahetseng, ebile ha e na liphetoho tsa metabolic.

Holim'a moo,HPMCe na le ts'ebeliso ho polymerization ea resin ea maiketsetso, lik'hemik'hale tsa petrole, lirafshoa, ho etsa pampiri, letlalo, litlolo, liphahlo, thepa ea moaho le lipoleiti tsa khatiso tse utloang maikutlo.