Hydroxypropylmethylcellulose (HPMC), monga polima wodziwika bwino wa hydrophilic mumakampani opanga mankhwala, imagwiritsidwa ntchito kwambiri mu zokutira mapiritsi, njira zowongolera kutulutsa mankhwala ndi njira zina zoperekera mankhwala. Chimodzi mwazinthu zofunika kwambiri za HPMC ndi kuthekera kwake kusunga madzi, zomwe zimakhudza magwiridwe antchito ake ngati chowonjezera cha mankhwala. M'nkhaniyi, tifufuza zinthu zazikulu zomwe zimakhudza kusunga madzi kwa HPMC, kuphatikiza kulemera kwa mamolekyulu, mtundu wosinthira, kuchuluka kwake, ndi pH.
kulemera kwa maselo
Kulemera kwa mamolekyulu a HPMC kumachita gawo lofunika kwambiri pakuzindikira mphamvu yake yosungira madzi. Kawirikawiri, HPMC yokhala ndi mamolekyulu ambiri imakhala yothandiza kwambiri kuposa HPMC yokhala ndi mamolekyulu ochepa ndipo imatha kuyamwa madzi ambiri. Izi zili choncho chifukwa ma HPMC okhala ndi mamolekyulu ambiri amakhala ndi maunyolo ataliatali omwe amatha kutsekereza ndikupanga netiweki yayikulu, zomwe zimawonjezera kuchuluka kwa madzi omwe amatha kuyamwa. Komabe, ziyenera kudziwika kuti HPMC yokhala ndi mamolekyulu ambiri ingayambitse mavuto monga kukhuthala ndi zovuta zokonza.
njira ina
Chinthu china chomwe chimakhudza mphamvu yosungira madzi ya HPMC ndi mtundu wa chosinthira. HPMC nthawi zambiri imabwera m'njira ziwiri: hydroxypropyl-substituted ndi methoxy-substituted. Mtundu wa hydroxypropyl-substituted uli ndi mphamvu yoyamwa madzi yambiri kuposa mtundu wa methoxy-substituted. Izi zili choncho chifukwa gulu la hydroxypropyl lomwe lili mu molekyulu ya HPMC ndi lokonda madzi ndipo limawonjezera mphamvu ya HPMC pamadzi. Mosiyana ndi zimenezi, mtundu wa methoxy-substituted sukonda madzi kwambiri ndipo motero uli ndi mphamvu yosunga madzi yochepa. Chifukwa chake, mitundu ina ya HPMC iyenera kusankhidwa mosamala kutengera zomwe mukufuna pa chinthu chomaliza.
ganizirani kwambiri
Kuchuluka kwa HPMC kumakhudzanso mphamvu yake yosungira madzi. Pa kuchuluka kochepa, HPMC sipanga kapangidwe kofanana ndi gel, kotero mphamvu yake yosungira madzi imakhala yochepa. Pamene kuchuluka kwa HPMC kukuwonjezeka, mamolekyu a polima anayamba kulowerera, ndikupanga kapangidwe kofanana ndi gel. Netiweki iyi ya gel imayamwa ndikusunga madzi, ndipo mphamvu yosungira madzi ya HPMC imawonjezeka ndi kuchuluka. Komabe, ziyenera kudziwika kuti kuchuluka kwambiri kwa HPMC kumabweretsa mavuto opangira monga kukhuthala ndi zovuta zokonza. Chifukwa chake, kuchuluka kwa HPMC komwe kumagwiritsidwa ntchito kuyenera kukonzedwa bwino kuti kukwaniritse mphamvu yosungira madzi yomwe ikufunika popewa mavuto omwe atchulidwa pamwambapa.
Mtengo wa PH
Kuchuluka kwa pH kwa malo omwe HPMC imagwiritsidwa ntchito kudzakhudzanso mphamvu yake yosungira madzi. Kapangidwe ka HPMC kali ndi magulu a anionic (-COO-) ndi magulu a ethylcellulose okonda madzi (-OH). Kuchuluka kwa ionization kwa magulu a -COO- kumadalira pH, ndipo digiri yawo ya ionization imawonjezeka ndi pH. Chifukwa chake, HPMC ili ndi mphamvu yayikulu yosungira madzi pa pH yayikulu. Pa pH yotsika, gulu la -COO- limapangidwa protonated ndipo hydrophilicity yake imachepa, zomwe zimapangitsa kuti mphamvu yosungira madzi ikhale yochepa. Chifukwa chake, pH ya chilengedwe iyenera kukonzedwa bwino kuti ikwaniritse mphamvu yosungira madzi ya HPMC yomwe ikufunika.
Pomaliza
Pomaliza, mphamvu yosungira madzi ya HPMC ndi chinthu chofunikira kwambiri chomwe chimakhudza magwiridwe antchito ake ngati chowonjezera cha mankhwala. Zinthu zazikulu zomwe zimakhudza mphamvu yosungira madzi ya HPMC ndi monga kulemera kwa mamolekyulu, mtundu wosinthira, kuchuluka kwa madzi ndi pH. Mwa kusintha mosamala zinthuzi, mphamvu yosungira madzi ya HPMC ikhoza kukonzedwa kuti ikwaniritse zomwe zimafunidwa ndi mankhwala omaliza. Ofufuza zamankhwala ndi opanga ayenera kuyang'anitsitsa zinthuzi kuti atsimikizire kuti mankhwala opangidwa ndi HPMC ndi abwino kwambiri komanso amagwira ntchito bwino.
Nthawi yotumizira: Ogasiti-05-2023