Yenziwe ngani i-hydroxypropyl methylcellulose?

I-Hydroxypropyl methylcellulose (HPMC) iyi-polymer eguquguqukayo futhi esetshenziswa kabanzi ezimbonini ezahlukene, eyaziwa ngezakhiwo zayo ezihlukile kanye nezinhlelo zokusebenza. Le nhlanganisela iyi-derivative ye-cellulose, i-polymer yemvelo etholakala ezindongeni zamaseli ezitshalo. Ukuze uqonde ukwakheka kwe-hydroxypropylmethylcellulose, kubalulekile ukucwaninga ngesakhiwo kanye nokwakheka kwale derivative ye-cellulose.

Isakhiwo se-cellulose:

I-Cellulose iyi-carbohydrate eyinkimbinkimbi equkethe uchungechunge oluqondile lwamayunithi e-β-D-glucose axhunywe yizibopho ze-β-1,4-glycosidic. Lawa maketanga e-glucose abanjwe ndawonye yizibopho ze-hydrogen ukuze akhe isakhiwo esiqondile esiqinile. I-Cellulose iyisakhi esiyinhloko sezindonga zamaseli ezitshalo, enikeza amandla nokuqina kumaseli ezitshalo.

Izinto ezithathwe ku-Hydroxypropyl Methylcellulose:

I-hydroxypropyl methylcellulose yenziwa ngokushintsha i-cellulose ngamakhemikhali nokufaka amaqembu e-hydroxypropyl kanye ne-methyl kuchungechunge oluyinhloko lwe-cellulose. Ukukhiqizwa kuvame ukuhlanganisa izinyathelo ezilandelayo:

Ukusabela kwe-Etherification:

I-Methylation: Ukwelapha i-cellulose ngesisombululo se-alkaline kanye ne-methyl chloride ukuze kungeniswe amaqembu e-methyl (-CH3) kumaqembu e-hydroxyl (-OH) e-cellulose.

I-Hydroxypropylation: I-cellulose ene-methylated iphinda isabela ne-propylene oxide ukuze ilethe amaqembu e-hydroxypropyl (-CH2CHOHCH3) esakhiweni se-cellulose. Le nqubo ithuthukisa ukuncibilika kwamanzi futhi ishintsha izakhiwo zomzimba ze-cellulose.

ukuhlanzwa:

I-cellulose eguquliwe iyahlanzwa ukuze kususwe noma yiziphi izinto ezingaphenduliwe, imikhiqizo engaphansi kwayo noma ukungcola.

Ukomisa nokugaya:

I-hydroxypropyl methylcellulose ehlanziwe iyomiswa bese igaywa ibe yimpuphu ecolekile elungele ukusetshenziswa ezinhlotsheni ezahlukene zokusebenza.

Izithako ze-Hydroxypropyl Methylcellulose:

Ukwakheka kwe-hydroxypropyl methylcellulose kubonakala ngezinga lokushintsha, okubhekisela ezingeni lapho amaqembu e-hydroxypropyl kanye ne-methyl athatha khona indawo yamaqembu e-hydroxyl kuchungechunge lwe-cellulose. Amazinga ahlukene e-HPMC anamazinga ahlukene okushintsha, okuthinta ukuncibilika kwawo, i-viscosity kanye nezinye izakhiwo.

Ifomula yamakhemikhali ye-hydroxypropyl methylcellulose ingachazwa ngokuthi (C6H7O2(OH)3-mn(OCH3)m(OCH2CH(OH)CH3)n)_x, lapho u-m no-n bemelela izinga lokufaka esikhundleni.

m: izinga le-methylation (amaqembu e-methyl ngeyunithi ngayinye ye-glucose)

n: izinga le-hydroxypropylation (amaqembu e-hydroxypropyl ngeyunithi ngayinye ye-glucose)

x: inani lamayunithi e-glucose ku-cellulose chain

Izici kanye nezinhlelo zokusebenza:

Ukuncibilika: I-HPMC incibilika emanzini, futhi izinga lokushintshaniswa lithinta izici zayo zokuncibilika. Yakha isixazululo esicacile nesiqinile emanzini, okwenza ifanelekele izinhlobo ezahlukene zokwakheka.

Ukujiya: Ukujiya kwesisombululo se-HPMC kuncike ezintweni ezifana nesisindo sama-molecule kanye nezinga lokushintshaniswa. Lesi sici sibalulekile ekusetshenzisweni okufana nemithi edinga ukwakheka kokukhululwa okulawulwayo.

Ukwakheka Kwefilimu: I-HPMC ingakha amafilimu amancane njengoba ikhambi loma, okwenza libe usizo ekumbozeni emikhakheni yezemithi, yokudla kanye neminye imboni.

Iziqinisi kanye Neziqinisi: Embonini yokudla, i-HPMC isetshenziswa njengesiqinisi kanye nesiqinisi emikhiqizweni eyahlukahlukene, okuhlanganisa amasoso, ama-dessert, kanye nezinto ezibhakiwe.

Ukusetshenziswa Kwemithi: I-HPMC isetshenziswa kabanzi ekwakhiweni kwemithi, okuhlanganisa amaphilisi, ama-capsule, kanye nezixazululo zamehlo, ngenxa yezakhiwo zayo zokukhululwa ezilawulwayo kanye nokuhambisana kwayo nezinto eziphilayo.

Ukwakhiwa kanye nokumbozwa: I-HPMC isetshenziswa ezintweni zokwakha ezifana nezimbozo, izinamathiseli zamathayili kanye nama-plaster. Iphinde isetshenziswe njengesithambisi kanye nesiqinisi ekwakhekeni kopende kanye nokumbozwa.

Imikhiqizo Yokunakekelwa Komuntu Siqu: Embonini yezimonyo nokunakekelwa komuntu siqu, i-HPMC itholakala emikhiqizweni efana nokhilimu, ama-lotion nama-shampoo, lapho inikeza khona ukuthungwa nokuqina.

I-hydroxypropyl methylcellulose itholakala nge-methylation kanye ne-hydroxypropylation ye-cellulose. Iyi-polymer enezinjongo eziningi enokusetshenziswa okubanzi. Izakhiwo zayo ezihlukile ziyenza ibe yigugu ezimbonini ezifana nemithi, ukudla, ukwakhiwa kanye nokunakekelwa komuntu siqu. Ukuguqulwa okulawulwayo kwe-cellulose kungalungisa izakhiwo ze-HPMC, okwenza kube yingxenye ebalulekile yemikhiqizo eminingi esihlangana nayo ekuphileni kwethu kwansuku zonke.