IHydroxypropylmethylcellulose (HPMC), njengepolymer esetyenziswa kakhulu kwishishini lezemithi, isetyenziswa kakhulu kwiingubo zeepilisi, kwiifomyula zokukhululwa ezilawulwayo nakwezinye iinkqubo zokuhambisa amayeza. Enye yeempawu eziphambili zeHPMC kukukwazi kwayo ukugcina amanzi, nto leyo echaphazela ukusebenza kwayo njengomxumi weyeza. Kweli nqaku, siza kuhlola izinto eziphambili ezichaphazela ukugcinwa kwamanzi kweHPMC, kubandakanya ubunzima beemolekyuli, uhlobo lokutshintshwa, uxinzelelo, kunye ne-pH.
ubunzima bemolekyuli
Ubunzima bemolekyuli ye-HPMC budlala indima ebalulekileyo ekumiseleni amandla ayo okugcina amanzi. Ngokubanzi, ubunzima bemolekyuli ephezulu ye-HPMC ithanda amanzi ngakumbi kune-HPMC enobunzima bemolekyuli obuphantsi kwaye inokufunxa amanzi amaninzi. Oku kungenxa yokuba ii-HPMC ezinobunzima bemolekyuli obuphezulu zinemixokelelwane emide enokubhijela kwaye yenze inethiwekhi ebanzi ngakumbi, nto leyo enyusa ubungakanani bamanzi anokufunxwa. Nangona kunjalo, kufuneka kuqatshelwe ukuba ubunzima bemolekyuli obuphezulu kakhulu be-HPMC buya kubangela iingxaki ezifana nobunzima bokuxinana kunye nobunzima bokucubungula.
enye indlela
Enye into echaphazela amandla okugcina amanzi e-HPMC luhlobo lotshintsho. I-HPMC ngokubanzi iza ngeendlela ezimbini: i-hydroxypropyl-substituted kunye ne-methoxy-substituted. Uhlobo lwe-hydroxypropyl-substituted lunamandla aphezulu okufunxa amanzi kunohlobo lwe-methoxy-substituted. Oku kungenxa yokuba iqela le-hydroxypropyl elikhoyo kwi-molecule ye-HPMC li-hydrophilic kwaye linyusa amandla e-HPMC emanzini. Ngokwahlukileyo koko, uhlobo lwe-methoxy-substituted alunamanzi amaninzi kwaye ngoko ke lunamandla amancinci okugcina amanzi. Ke ngoko, iintlobo ezahlukeneyo ze-HPMC kufuneka zikhethwe ngononophelo ngokusekelwe kwiimpawu ezifunwayo zemveliso yokugqibela.
gxila kwi
Uxinzelelo lwe-HPMC lukwachaphazela amandla ayo okugcina amanzi. Xa kuxinana okuphantsi, i-HPMC ayenzi isakhiwo esifana nejeli, ngoko ke amandla ayo okugcina amanzi aphantsi. Njengoko uxinzelelo lwe-HPMC lusanda, iimolekyuli zepolymer zaqala ukuxinana, zenza isakhiwo esifana nejeli. Le network yejeli ifunxa kwaye igcina amanzi, kwaye amandla okugcina amanzi e-HPMC ayanda ngoxinzelelo. Nangona kunjalo, kufuneka kuqatshelwe ukuba uxinzelelo oluphezulu kakhulu lwe-HPMC luya kukhokelela kwiingxaki zokwenziwa ezifana nobunzima bokuxinana kunye nokucubungula. Ke ngoko, uxinzelelo lwe-HPMC olusetyenzisiweyo kufuneka luphuculwe ukuze kufezekiswe amandla okugcina amanzi afunekayo ngelixa kuthintelwa iingxaki ezikhankanyiweyo apha ngasentla.
Ixabiso le-PH
Ixabiso le-pH yendawo esetyenziswa kuyo i-HPMC liya kuchaphazela amandla ayo okugcina amanzi. Ulwakhiwo lwe-HPMC luqulathe amaqela e-anionic (-COO-) kunye namaqela e-hydrophilic ethylcellulose (-OH). I-ionization yamaqela e-COO- ixhomekeke kwi-pH, kwaye inqanaba lawo le-ionization liyakhula nge-pH. Ke ngoko, i-HPMC inomthamo ophezulu wokugcina amanzi kwi-pH ephezulu. Kwi-pH ephantsi, iqela le-COO- liyaprotonated kwaye i-hydrophilicity yalo iyancipha, nto leyo ebangela ukuba amandla okugcina amanzi aphantsi. Ke ngoko, i-pH yendawo engqongileyo kufuneka iphuculwe ukuze kufezekiswe amandla okugcina amanzi afunekayo e-HPMC.
ukuququmbela
Ukuqukumbela, amandla okugcina amanzi e-HPMC yinto ephambili echaphazela ukusebenza kwayo njengomxumi wamayeza. Izinto eziphambili ezichaphazela amandla okugcina amanzi e-HPMC ziquka ubunzima beemolekyuli, uhlobo lokutshintsha, uxinzelelo kunye nexabiso le-pH. Ngokulungisa ngononophelo ezi zinto, amandla okugcina amanzi e-HPMC anokulungiswa ukuze kufezekiswe iipropati ezifunwayo zemveliso yokugqibela. Abaphandi bamayeza kunye nabavelisi kufuneka baqwalasele ezi zinto ukuqinisekisa umgangatho ophezulu kunye nokusebenza kweefomyula zamayeza ezisekelwe kwi-HPMC.
Ixesha lokuthumela: Agasti-05-2023