Ho boloka metsi ke thepa ea bohlokoa bakeng sa liindasteri tse ngata tse sebelisang lintho tsa hydrophilic tse kang cellulose ethers. Hydroxypropylmethylcellulose (HPMC) ke e 'ngoe ea li-cellulose ethers tse nang le thepa e phahameng ea ho boloka metsi. HPMC ke semi-synthetic polymer e nkiloeng ho selulose 'me e sebelisoa hangata lits'ebetsong tse fapaneng indastering ea kaho, ea meriana le ea lijo.
HPMC e sebelisoa haholo joalo ka setenya, se tsitsisa le se emulsifier lihlahisoa tse fapaneng tsa lijo joalo ka ice cream, li-sauces le lirosa ho ntlafatsa sebopeho sa tsona, botsitso le bophelo ba lishelefo. HPMC e boetse e sebelisoa tlhahisong ea meriana indastering ea meriana e le setlamo se kopanyang, se senyang le ho koahela lifilimi. E boetse e sebelisoa e le ntho e bolokang metsi linthong tsa ho haha, haholo-holo ka samente le seretse.
Ho boloka metsi ke thepa ea bohlokoa kahong hobane e thusa ho thibela samente e ncha e tsoakiloeng le seretse hore li se ke tsa omella. Ho omisa ho ka baka ho fokotseha le ho phunyeha, ho fella ka mehaho e fokolang le e sa tsitsang. HPMC e thusa ho boloka metsi a samente le seretse ka ho monya limolek'hule tsa metsi le ho li lokolla butle ha nako e ntse e ea, e lumella lisebelisoa tsa mohaho hore li fole le ho thatafala.
Molao-motheo oa ho boloka metsi oa HPMC o thehiloe holim'a hydrophilicity ea eona. Ka lebaka la boteng ba lihlopha tsa hydroxyl (-OH) mohahong oa limolek'hule, HPMC e na le kamano e phahameng ea metsi. Lihlopha tsa hydroxyl li sebelisana le limolek'hule tsa metsi ho etsa li-bond tsa hydrogen, e leng se etsang hore ho thehoe khetla ea hydration ho pota-pota liketane tsa polymer. Khetla ea hydrated e lumella liketane tsa polymer ho hola, ho eketsa molumo oa HPMC.
Ho ruruha ha HPMC ke ts'ebetso e matla e itšetlehileng ka lintlha tse fapaneng tse kang degree of substitution (DS), boholo ba likaroloana, mocheso le pH. Tekanyo ea ho nka sebaka e bolela palo ea lihlopha tsa hydroxyl tse nketsoeng sebaka ka yuniti ea anhydroglucose ka har'a ketane ea selulose. Ha boleng ba DS bo phahame, ho ba le hydrophilicity e phahameng le ts'ebetso e ntle ea ho boloka metsi. Boholo ba karoloana ea HPMC bo boetse bo ama ho bolokoa ha metsi, kaha likaroloana tse nyane li na le sebaka se seholo ho feta boima ba yuniti, e bakang ho monya metsi ho hoholo. Thempereichara le boleng ba pH li ama tekanyo ea ho ruruha le ho bolokoa ha metsi, 'me mocheso o phahameng le boleng bo tlaase ba pH li ntlafatsa ho ruruha le ho boloka metsi a HPMC.
Mokhoa oa ho boloka metsi oa HPMC o kenyelletsa mekhoa e 'meli: ho monya le ho senya. Nakong ea ho monya, HPMC e monya limolek'hule tsa metsi ho tsoa tikolohong e haufi, e etsa khetla ea hydration ho potoloha liketane tsa polymer. Khetla ea hydration e thibela liketane tsa polymer hore li se ke tsa putlama 'me li li boloka li arohane, e leng se lebisang ho ruruheng ha HPMC. Limolek'hule tsa metsi tse monngoeng li theha maqhama a haedrojene le lihlopha tsa hydroxyl ho HPMC, ho ntlafatsa ts'ebetso ea ho boloka metsi.
Nakong ea desorption, HPMC e ntša butle-butle limolek'hule tsa metsi, e lumellang thepa ea mohaho hore e fole hantle. Ho lokolloa butle-butle ha limolek'hule tsa metsi ho tiisa hore samente le seretse li lula li le metsi ka ho feletseng, e leng se etsang hore ho be le mohaho o tsitsitseng le o tšoarellang. Ho lokolloa butle ha limolek'hule tsa metsi ho boetse ho fana ka phepelo ea kamehla ea metsi ho samente le seretse, ho matlafatsa ts'ebetso ea ho folisa le ho eketsa matla le botsitso ba sehlahisoa sa ho qetela.
Ka kakaretso, ho boloka metsi ke thepa ea bohlokoa bakeng sa liindasteri tse ngata tse sebelisang lintho tsa hydrophilic tse kang cellulose ethers. HPMC ke e 'ngoe ea li-cellulose ethers tse nang le thepa e phahameng ea ho boloka metsi 'me e sebelisoa haholo indastering ea kaho, ea meriana le ea lijo. Thepa ea ho boloka metsi ea HPMC e ipapisitse le hydrophilicity ea eona, e e nolofalletsang ho monya limolek'hule tsa metsi ho tsoa tikolohong e potolohileng, ho etsa khetla ea hydration ho potoloha liketane tsa polymer. Khetla ea hydrated e etsa hore HPMC e ruruhe, 'me ho lokolloa butle-butle ha limolek'hule tsa metsi ho tiisa hore thepa ea mohaho e lula e le metsi ka ho feletseng, e leng se etsang hore ho be le mohaho o tsitsitseng le o tšoarellang.
Nako ea poso: Aug-24-2023