introduce
Cellulose ethers anionic water-soluble polymers anobva ku cellulose.Aya mapolymer ane akawanda mashandisirwo mumaindasitiri akasiyana akadai sechikafu, mishonga, zvizorwa, uye kuvaka nekuda kwezvivakwa zvavo zvakaita sekukora, magelling, firimu-kugadzira, uye emulsifying.Chimwe chezvinhu zvakakosha zve cellulose ethers ndiyo tembiricha yavo yekudziya gelation (Tg), tembiricha iyo iyo polymer inopinda chikamu chekuchinja kubva kusol kuenda kugel.Ichi chivakwa chakakosha pakuona kushanda kwe cellulose ethers mune akasiyana maapplication.Muchikamu chino, tinokurukura tembiricha yekudziya gelation yehydroxypropyl methylcellulose (HPMC), imwe yeanonyanya kushandiswa cellulose ethers muindasitiri.
Thermal gelation tembiricha yeHPMC
HPMC is a semi-synthetic cellulose ether inoshandiswa zvakanyanya mumashandisirwo akasiyana siyana nekuda kwekusiyana kwayo.HPMC inonyanya kunyungudika mumvura, ichigadzira yakajeka viscous mhinduro pane yakaderera concentrations.Panzvimbo dzepamusoro, HPMC inoumba gels anodzoreredzwa pakudziya uye kutonhora.Thermal gelation yeHPMC inhanho mbiri-nhanho inosanganisira kuumbwa kwe micelles inoteverwa nekuunganidza micelles kuumba gel network (Mufananidzo 1).
Iyo yekupisa gelation tembiricha yeHPMC inotsamira pane akati wandei zvinhu zvakaita sedhigirii rekutsiva (DS), uremu hwemamorekuru, kusungwa, uye pH yemhinduro.Kazhinji, iyo yakakwirira iyo DS uye molecular huremu hweHPMC, iyo yakakwirira yekupisa kwegelation tembiricha.Iko kusungirirwa kweHPMC mumhinduro kunobatawo Tg, iyo yakakwira iyo yekumisikidza, iyo yakakwira Tg.Iyo pH yemushonga inobatawo iyo Tg, ine acidic mhinduro inokonzera yakaderera Tg.
Thermal gelation yeHPMC inodzokororwa uye inogona kukanganiswa nezvinhu zvakasiyana-siyana zvekunze senge shear force, tembiricha, uye munyu.Shear inopwanya gel chimiro uye inodzikisa Tg, nepo kuwedzera tembiricha kunokonzera kuti gel rinyunguduke uye kudzikisa Tg.Kuwedzera munyu kune mhinduro kunobatawo Tg, uye kuvapo kwemacations akadai se calcium uye magnesium inowedzera Tg.
Kushandiswa kweakasiyana Tg HPMC
Iyo thermogelling maitiro eHPMC anogona kugadzirwa kune akasiyana maapplication.Low Tg HPMCs anoshandiswa mumashandisirwo anoda kukurumidza gelation, senge ipapo dessert, sosi uye soup maumbirwo.HPMC ine Tg yakakwira inoshandiswa muzvishandiso zvinoda kunonoka kana kurebesa gelation, sekugadzira masisitimu ekutumira zvinodhaka, mahwendefa ekuburitsa anoenderera, uye maronda ekupfeka.
Muindasitiri yechikafu, HPMC inoshandiswa seyakakora, inosimbisa uye gelling agent.Yakaderera Tg HPMC inoshandiswa mukukurumidza dhizaini magadzirirwo anoda kukurumidza gelation kuti ipe inodiwa manyorerwo uye muromo.HPMC ine Tg yakakwirira inoshandiswa mune yakaderera-mafuta kupararira mafomu uko kunonoka kana kureba gelation kunodiwa kudzivirira syneresis uye kuchengetedza kupararira chimiro.
Muindasitiri yemishonga, HPMC inoshandiswa sebhainda, disintegrant uye inosimudzira kuburitsa mumiririri.HPMC ine Tg yakakwirira inoshandiswa mukugadzirwa kwemapiritsi akawedzerwa-kusunungurwa, apo kunonoka kana kureba gelation kunodiwa kusunungura mushonga kwenguva yakareba.Yakaderera Tg HPMC inoshandiswa mukugadzira mahwendefa anopatsanura nemuromo, uko kukurumidza kuparara uye gelation inodiwa kuti ipe muromo unodiwa uye nyore kumedza.
mukupedzisa
Iyo yekupisa gelation tembiricha yeHPMC chinhu chakakosha chinotarisa maitiro ayo mune akasiyana maapplication.HPMC inogona kugadzirisa Tg yayo kuburikidza nedhigirii rekutsiva, uremu hwemamorekuru, kutarisisa uye pH kukosha kwemhinduro kuti ikwane akasiyana maapplication.HPMC ine Tg yakaderera inoshandiswa kune zvikumbiro zvinoda kukurumidza kugezwa, nepo HPMC ine Tg yakakwira inoshandiswa pamaapplication anoda kunonoka kana kurebesa gelation.HPMC inogoneka uye inoshanda zvakasiyana-siyana cellulose ether ine akawanda anogona kushandiswa mumaindasitiri akasiyana.
Nguva yekutumira: Aug-24-2023