Hydroxypropyl methylcellulose, inozivikanwa seHPMC, chinhu chinoshandiswa zvakanyanya mumishonga uye chinowedzera chikafu. Nekuda kwekunyungudika kwayo kwakanaka, kugona kwayo kusunga uye hunhu hwayo hwekugadzira firimu, yave ichishandiswa zvakanyanya muindasitiri yemishonga. HPMC inowanzoshandiswawo muindasitiri yezvekudya sechinosimbisa, chinosanganisa uye chinosimbisa. Kuchena kweHPMC kwakakosha zvikuru muindasitiri yezvemishonga nezvezvekudya sezvo kuchikanganisa kushanda zvakanaka uye kuchengetedzeka kwechigadzirwa. Chinyorwa chino chichakurukura nezvekusarudzwa kwekuchena kweHPMC nenzira dzayo.
Chii chinonzi HPMCs?
Hydroxypropylmethylcellulose (HPMC) i cellulose ether inobva ku methylcellulose. Huremu hwayo hwemamorekuru hunosvika 10,000 kusvika 1,000,000 Daltons, uye ihupfu huchena kana husina kuchena, hahunhuwi uye hahuna kunaka. HPMC inonyungudika nyore mumvura, uye inonyungudikawo mune zvimwe zvinonyungudutsa zvakaita se ethanol, butanol, uye chloroform. Ine zvimwe zvinhu zvakasiyana zvakaita sekuchengetedza mvura, kukora uye kusunga, izvo zvinoita kuti ive yakakodzera kumaindasitiri emishonga nekudya.
Kuziva kuchena kweHPMC
Kuchena kweHPMC kunoenderana nezvinhu zvakati wandei zvakaita sedanho rekutsiva (DS), hunyoro uye dota. DS inomiririra huwandu hwemapoka ehydroxyl anotsiviwa nemapoka ehydroxypropyl mumorekuru yecellulose. Dhigirii repamusoro rekutsiva rinowedzera kunyungudika kweHPMC uye rinovandudza kugona kwekugadzira firimu. Kusiyana neizvi, dhigirii shoma rekutsiva rinoguma nekudzikira kwekunyungudika uye hunhu husina kunaka hwekugadzira firimu.
Nzira Yekuona Kuchena kweHPMC
Kune nzira dzakasiyana siyana dzekuona kuchena kweHPMC, dzinosanganisira acid-base titration, elemental analysis, high-performance liquid chromatography (HPLC), uye infrared spectroscopy (IR). Heano mamwe mashoko enzira imwe neimwe:
titration yeasidhi-base
Nzira iyi yakavakirwa pakuita kwekusagadzikana pakati pemapoka ane acidic neakakosha muHPMC. Kutanga, HPMC inonyungudutswa mu solvent uye huwandu hunozivikanwa hwe acid kana base solution ine concentration inozivikanwa hunowedzerwa. Titration yakaitwa kusvika pH yasvika pa neutral point. Kubva pahuwandu hwe acid kana base inodyiwa, mwero wekutsiva unogona kuverengerwa.
Kuongorora zvinhu zvepakutanga
Kuongororwa kwezvinhu kunotarisa chikamu chechinhu chimwe nechimwe chiri mumuenzaniso, kusanganisira kabhoni, hydrogen, uye okisijeni. Mwero wekutsiva unogona kuverengerwa kubva pahuwandu hwechinhu chimwe nechimwe chiri mumuenzaniso weHPMC.
Kuongororwa kweLiquid Chromatography (HPLC)
HPLC inzira inoshandiswa zvakanyanya yekuongorora inoparadzanisa zvikamu zvemusanganiswa zvichibva pakubatana kwazvo nezvikamu zvisingachinji uye zvinofamba. MuHPMC, mwero wekutsiva unogona kuverengerwa nekuyera chiyero chehydroxypropyl kune mapoka emethyl mumuenzaniso.
Kuongororwa kweInfrared Spectroscopy (IR)
Infrared spectroscopy inzira yekuongorora inoyera kupinza kana kutapurirana kwemwaranzi ye infrared nemuenzaniso. HPMC ine peaks dzakasiyana dzekubvisa hydroxyl, methyl uye hydroxypropyl, iyo inogona kushandiswa kuona mwero wekutsiva.
Kuchena kweHPMC kwakakosha mumaindasitiri emishonga nezvekudya, uye kusarudzwa kwayo kwakakosha kuti chigadzirwa chekupedzisira chive chakachengeteka uye chinoshanda. Kune nzira dzakasiyana siyana dzekuona kuchena kweHPMC, kusanganisira acid-base titration, elemental analysis, HPLC, uye IR. Nzira yega yega ine zvayakanakira nezvayakaipira uye inogona kusarudzwa zvichienderana nezvinodiwa zvekushandisa. Kuti HPMC irambe yakachena, inofanira kuchengetwa munzvimbo yakaoma, inotonhorera kure nezuva nezvimwe zvinosvibisa.
Nguva yekutumira: Nyamavhuvhu-25-2023