HPMC inonyungudika pa pH yakadii

Hydroxypropyl methylcellulose (HPMC)ipolymer inowanzoshandiswa mumishonga, zvizoro, uye zvigadzirwa zvekudya. Kunyungudika kwayo kunoenderana nezvinhu zvakasiyana-siyana, kusanganisira pH. Kazhinji, HPMC inonyungudika mumamiriro ese ari maviri ane acidic uye alkaline, asi kunyungudika kwayo kunogona kusiyana zvichienderana nehuwandu hwekutsiva (DS) uye huremu hwemolecular (MW) yepolymer.

Mumamiriro ezvinhu ane acidity, HPMC inowanzo ratidza kunyungudika kwakanaka nekuda kwekuwedzera kwemapoka ayo ehydroxyl, izvo zvinowedzera kunyorova uye kupararira kwayo. Kunyungudika kweHPMC kunowanzo kuwedzera sezvo pH ichiderera pasi pepKa yayo, inova inenge 3.5–4.5 zvichienderana nehuwandu hwekutsiva.

Kusiyana neizvi, mumamiriro ezvinhu ealkaline, HPMC inogonawo kunyungudika, kunyanya kana pH yakakwira. Paalkaline pH, kubviswa kweproton yemapoka ehydroxyl kunoitika, zvichikonzera kuwedzera kwekunyungudika kuburikidza nekubatana kwehydrogen nemamorekuru emvura.

Zvisinei, zvakakosha kuziva kuti pH chaiyo iyo HPMC inonyungudika inogona kusiyana zvichienderana negiredhi chaiyo yeHPMC, mwero wayo wekutsiva, uye huremu hwayo hwemamorekuru. Kazhinji, mamakisi eHPMC ane madhigirii akakwira ekutsiva uye mamorekuru akaderera anoratidza kunyungudika kuri nani pa pH yakaderera.

Mumishonga yekurapa,HPMCinowanzoshandiswa sechinhu chinoumba firimu, chinosimbisa, kana kuti chinosimbisa. Hunhu hwayo hwekunyungudika hwakakosha pakudzora ma profiles ekuburitswa kwemishonga, kusimba kwemafomura, uye kugadzikana kwe emulsions kana suspensions.

nepo HPMC ichiwanzonyungudika pamusoro pe pH yakakura, maitiro ayo ekunyungudika anogona kugadziriswa nekugadzirisa pH yemushonga uye kusarudza giredhi rakakodzera reHPMC zvichienderana nekushandiswa kwaunoda.