Maitiro Ekuona Hydroxypropyl Methylcellulose (HPMC)

Hydroxypropyl Methylcellulose (HPMC)imhando ye ether isingashandisike zvakanyanya muzvinhu zvekuvaka, mishonga, chikafu, machira, nedzimwe nzvimbo. Kugadzikana kwekushanda kwayo uye hunhu hwayo zvinokanganisa zvakananga mhedzisiro yechigadzirwa chekupedzisira; saka, kuyedzwa kwakarongeka kweHPMC panguva yekugadzira nekushandisa kwakakosha zvikuru.

1. Chitarisiko uye Kuedzwa Kwepfuma Yepakutanga

Sampuro inotanga yaonekwa nemaziso. HPMC yepamusoro-soro inofanira kunge iri upfu huchena kana husina kuchena uye hunokwanisa kuyerera zvakanaka, husina mapundu, hwema, kana tsvina. Mvura yayo inofanira kunge yakajeka kana kuti ine madhaka zvishoma, isina zvinhu zvinoonekwa zvakasungirirwa. Mushure mezvo, hunyoro hwayo hunoonekwa, kazhinji uchishandisa infrared moisture analyzer kana nzira yekuomesa (105℃ constant weight method). Zvigadzirwa zvakakodzera zvinowanzova nehunyoro huri pasi pe5%.

Kuongororwa kwehuwandu hwedota kunoratidza huwandu hwayo hwekusachena. Muenzaniso wacho unobatidzwa muchoto chemuffle pa550℃ kusvika pahuremu hwakaenzana. Huwandu hwedota hunowanzo fanirwa kusapfuura 1.5%. Huwandu hwedota hwakawandisa hunokanganisa kujeka kwemushonga uye kugadzikana kwe viscosity.

2. Kuedzwa kweViscosity

Kusimba kwebvudzi ndicho chimwe chezviratidzo zvakakosha zvekushanda kweHPMC, zvichiratidza zvakananga kusimba kwayo, kuchengetedza mvura, uye mhedzisiro yekugadzira firimu. Kuedza kunowanzoitwa uchishandisa rotational viscometer (yakadai seBrookfield viscometer) kana Ubbelohde capillary viscometer.

Munguva yekuyedza, huwandu hwakati wandei (kazhinji 2%) hwemvura yeHPMC inoedzwa patembiricha yakatarwa (kazhinji 20 ± 0.1℃). Mhando dzakasiyana dzeHPMC dzine huwandu hwakasiyana hwe viscosity, senge 400, 15000, uye 100000 mPa·s. Viscosity yakayerwa inofanira kuenderana nehuwandu hwechigadzirwa; zvikasadaro, zvinoratidza kuti mwero wayo we polymerization kana kutsiviwa hauna kugadzikana.

3. Kuongororwa Kwekutsiva (Methoxy neHydroxypropoxy Content)

Kushanda kweHPMC kunonyanya kuenderana nehuwandu hwezvinhu zvinotsiva.
Zviri mukati methoxy (–OCH₃) zvinokanganisa kunyungudika, tembiricha yegel, uye mashandiro epamusoro;
Kuwanda kwehydroxypropoxy (–OCH₂CHOHCH₃) kunokanganisa kuchinjika uye kuchengetwa kwemvura.

Nzira dzekuona dzinowanzo shandisa makemikari e titration kana gas chromatography. Semuenzaniso, mushure mekubviswa kweasidhi, sampuro inoburitsa alcohols dzinoenderana, idzo dzinozoongororwa nehuwandu ne titration kana chromatography. Zvigadzirwa zveHPMC zvakakodzera zvinowanzova ne 19%–24% methoxyl content uye 4%–12% hydroxypropoxyl content.

4. Kuyera Kupisa kweGel

Hunhu hweHPMC hwethermogel ndiyo parameter huru inoisiyanisa nedzimwe cellulose ethers. Munguva yekuedza, HPMC aqueous solution inodziiswa zvishoma nezvishoma uye inokurunga, uye tembiricha iyo mhinduro inoshanduka kubva pakuchena kuenda pakusviba inonyorwa setembiricha yayo yegel.

Kazhinji, HPMC ine methoxyl yakawanda ine tembiricha yakaderera yegel, nepo hydroxypropoxyl yakawanda ichikonzera tembiricha yakawanda yegel. Ichi chiratidzo chine chekuita nekugadzikana kwechigadzirwa mumashandisirwo akadai sekuvaka mortar uye tablet coating.

5. Kuyedzwa kwe pH uye Kunyungudika kwemvura

Mushure mekugadzirira 2% HPMC solution, pH yayo inoyerwa uchishandisa pH meter. Range yakajairika i5.0–8.0. Mukati merange iyi, HPMC yakagadzikana uye haizokanganisike nezvinhu zvakawanda zvisingararami kana zvimwe zvinowedzerwa.

Kuyedzwa kwekunyungudika kunoongorora kupararira kwayo uye mwero wekunyungudika kwayo mumvura inotonhora. HPMC yepamusoro-soro inofanira kupararira nekukurumidza ichikurunga, ichigadzira mhinduro yakafanana uye yakajeka mukati memaminitsi makumi matatu.

6. Kuonekwa Kwekuchena Nekusachena

Kuonekwa kwekuchena kunosanganisira kuongororwa kwesimbi dzinorema, machloride, sulfates, uye miganhu yehutachiona.

Heavy metal content (sePb) haifanirwe kudarika 20 ppm; chloride ≤ 0.2%, sulfate ≤ 0.5%;

Pakushandisa mishonga kana chikafu, huwandu hwemabhakitiriya, mabhakitiriya ecoliform, uye huwandu hwemafungu/mbiriso hunofanirawo kuongororwa kuti pave nechokwadi chekuti zvakachengeteka.

7. Kuongororwa kweThermogravimetric uye Fourier Transform Infrared Spectroscopy

Kuti tiwedzere kuongorora chimiro uye kugadzikana kwekupisa kweHPMC, thermogravimetric analysis (TGA) uye Fourier transform infrared spectroscopy (FTIR) zvinogona kushandiswa.

TGA inogona kuona shanduko huru yeHPMC patembiricha dzakasiyana, nokudaro ichisarudza tembiricha yayo yekuora kwekupisa uye huwandu hwekugadzikana;

FTIR inoongorora chimiro cheboka rinoshanda kuburikidza nematanho ekunyudzwa, ichisimbisa kuvapo kwemabhandi ekunyudzwa ane hunhu hwe –OH, –OCH₃, uye –OCH₂CHOHCH₃ kusimbisa kururama kwechimiro chemamorekuru.

Kuyedzwa kwakarongeka kwataurwa pamusoro apa kunobvumira kuongororwa kwakazara kwehunhu hwe physicochemical uye kukodzera kwekushandisa kwe HPMC. Kusimba, mwero wekutsiva, uye huwandu hwehunyoro ndizvo zviratidzo zvikuru zvekudzora hunhu; nepo pH, huwandu hwedota, uye tembiricha ye gelation zvichiratidza mazinga ekugadzirisa uye kuchena kwayo. Kunyatsotevedzera maitiro aya ekuyedza hakungovimbisi chete kugadzikana kwechigadzirwa uye kushanda kwacho asiwo kunopa rutsigiro rwakavimbika rwedata rekuchengetedza uyekushandiswa zvakanaka kweHPMCmumaindasitiri akadai sekuvaka, mishonga, uye chikafu.